From 99e7a688736919ee642ba3f89b691804c485ad7f Mon Sep 17 00:00:00 2001
From: Matthew Pitkin <matthew.pitkin@ligo.org>
Date: Mon, 4 Feb 2019 23:33:53 +0000
Subject: [PATCH 1/4] An attempt at allowing the 'TCB' units in PINT:  - refs
 nanograv/PINT#37 and nanograv/PINT#151

---
 pint/models/astrometry.py       | 18 +++++--
 pint/models/binary_ell1.py      |  3 ++
 pint/models/dispersion_model.py | 22 +++++++--
 pint/models/pulsar_binary.py    | 18 +++++--
 pint/models/spindown.py         | 20 ++++++--
 pint/models/timing_model.py     | 41 +++++++++++-----
 pint/models/wave.py             |  6 ++-
 pint/observatory/observatory.py | 87 ++++++++++++++++++++++++++++++++-
 pint/observatory/topo_obs.py    |  3 +-
 pint/toa.py                     | 75 +++++++++++++++++++++++++++-
 10 files changed, 258 insertions(+), 35 deletions(-)

diff --git a/pint/models/astrometry.py b/pint/models/astrometry.py
index c013f5991..08ecef031 100644
--- a/pint/models/astrometry.py
+++ b/pint/models/astrometry.py
@@ -42,7 +42,6 @@ def __init__(self):
     def setup(self):
         super(Astrometry, self).setup()
 
-
     def ssb_to_psb_xyz_ICRS(self, epoch=None):
         """Returns unit vector(s) from SSB to pulsar system barycenter under ICRS.
 
@@ -54,7 +53,10 @@ def ssb_to_psb_xyz_ICRS(self, epoch=None):
     def barycentric_radio_freq(self, toas):
         """Return radio frequencies (MHz) of the toas corrected for Earth motion"""
         tbl = toas.table
-        L_hat = self.ssb_to_psb_xyz_ICRS(epoch=tbl['tdbld'].astype(numpy.float64))
+        if self.UNITS.value == 'TCB':
+            L_hat = self.ssb_to_psb_xyz_ICRS(epoch=tbl['tcbld'].astype(numpy.float64))
+        else:
+            L_hat = self.ssb_to_psb_xyz_ICRS(epoch=tbl['tdbld'].astype(numpy.float64))
         v_dot_L_array = numpy.sum(tbl['ssb_obs_vel']*L_hat, axis=1)
         return tbl['freq'] * (1.0 - v_dot_L_array / const.c)
 
@@ -66,7 +68,10 @@ def solar_system_geometric_delay(self, toas, acc_delay=None):
         available as 3-vector toa.xyz, in units of light-seconds.
         """
         tbl = toas.table
-        L_hat = self.ssb_to_psb_xyz_ICRS(epoch=tbl['tdbld'].astype(numpy.float64))
+        if self.UNITS.value == 'TCB':
+            L_hat = self.ssb_to_psb_xyz_ICRS(epoch=tbl['tcbld'].astype(numpy.float64))
+        else:
+            L_hat = self.ssb_to_psb_xyz_ICRS(epoch=tbl['tdbld'].astype(numpy.float64))
         re_dot_L = numpy.sum(tbl['ssb_obs_pos']*L_hat, axis=1)
         delay = -re_dot_L.to(ls).value
         if self.PX.value != 0.0 \
@@ -88,7 +93,10 @@ def get_d_delay_quantities(self, toas):
         # TODO: tbl['tdbld'].quantity should have units of u.day
         # NOTE: Do we need to include the delay here?
         tbl = toas.table
-        rd['epoch'] = tbl['tdbld'].quantity * u.day #- delay * u.second
+        if self.UNITS.value == 'TCB':
+            rd['epoch'] = tbl['tcbld'].quantity * u.day #- delay * u.second
+        else:
+            rd['epoch'] = tbl['tdbld'].quantity * u.day #- delay * u.second
 
         # Distance from SSB to observatory, and from SSB to psr
         ssb_obs = tbl['ssb_obs_pos'].quantity
@@ -190,6 +198,7 @@ def setup(self):
                             "POSEPOCH or PEPOCH are required if PM is set.")
                 else:
                     self.POSEPOCH.quantity = self.PEPOCH.quantity
+            self.POSEPOCH.scale = self.UNITS.value.lower()
 
     def print_par(self):
         result = ''
@@ -358,6 +367,7 @@ def setup(self):
                             "POSEPOCH or PEPOCH are required if PM is set.")
                 else:
                     self.POSEPOCH.quantity = self.PEPOCH.quantity
+                    self.POSEPOCH.scale = self.UNITS.value.lower()
 
     def get_psr_coords(self, epoch=None):
         """Returns pulsar sky coordinates as an astropy ecliptic oordinates
diff --git a/pint/models/binary_ell1.py b/pint/models/binary_ell1.py
index ca876230f..24397a434 100644
--- a/pint/models/binary_ell1.py
+++ b/pint/models/binary_ell1.py
@@ -61,10 +61,13 @@ def setup(self):
                 warn("Since ECC is 0.0, using T0 as TASC.")
                 if self.T0.value is not None:
                     self.TASC.value = self.T0.value
+                    self.TASC.scale = self.UNITS.value.lower()
                 else:
                     raise MissingParameter("ELL1", 'T0', "T0 or TASC is required for ELL1 model.")
             else:
                 raise MissingParameter("ELL1", 'TASC', "TASC is required for ELL1 model.")
+        else:
+            self.TASC.scale = self.UNITS.value.lower()
 
 
 
diff --git a/pint/models/dispersion_model.py b/pint/models/dispersion_model.py
index 0205cd89e..b6afba0c7 100644
--- a/pint/models/dispersion_model.py
+++ b/pint/models/dispersion_model.py
@@ -80,6 +80,8 @@ def setup(self):
             if self.DMEPOCH.value is None:
                 raise MissingParameter("Dispersion", "DMEPOCH",
                         "DMEPOCH is required if DM1 or higher are set")
+            else:
+                self.DMEPOCH.scale = self.UNITS.value.lower()
         base_dms = list(self.get_prefix_mapping_component('DM').values())
         base_dms += ['DM',]
 
@@ -105,10 +107,16 @@ def base_dm(self, toas):
         dm = np.zeros(len(tbl))
         dm_terms = self.get_DM_terms()
         if self.DMEPOCH.value is None:
-            DMEPOCH = tbl['tdbld'][0]
+            if self.UNITS.value == 'TCB':
+                DMEPOCH = tbl['tcbld'][0]
+            else:
+                DMEPOCH = tbl['tdbld'][0]
         else:
             DMEPOCH = self.DMEPOCH.value
-        dt = (tbl['tdbld'] - DMEPOCH) * u.day
+        if self.UNITS.value == 'TCB':
+            dt = (tbl['tcbld'] - DMEPOCH) * u.day
+        else:
+            dt = (tbl['tdbld'] - DMEPOCH) * u.day
         dt_value = (dt.to(u.yr)).value
         dm_terms_value = [d.value for d in dm_terms]
         dm = taylor_horner(dt_value, dm_terms_value)
@@ -156,10 +164,16 @@ def d_delay_d_DMs(self, toas, param_name, acc_delay=None): # NOTE we should have
         dm_terms = np.longdouble(np.zeros(len(dms)))
         dm_terms[order] = np.longdouble(1.0)
         if self.DMEPOCH.value is None:
-            DMEPOCH = tbl['tdbld'][0]
+            if self.UNITS.value == 'TCB':
+                DMEPOCH = tbl['tcbld'][0]
+            else:
+                DMEPOCH = tbl['tdbld'][0]
         else:
             DMEPOCH = self.DMEPOCH.value
-        dt = (tbl['tdbld'] - DMEPOCH) * u.day
+        if self.UNITS.value == 'TCB':
+            dt = (tbl['tcbld'] - DMEPOCH) * u.day
+        else:
+            dt = (tbl['tdbld'] - DMEPOCH) * u.day
         dt_value = (dt.to(u.yr)).value
         d_dm_d_dm_param = taylor_horner(dt_value, dm_terms)* (self.DM.units/par.units)
         return DMconst * d_dm_d_dm_param/ bfreq**2.0
diff --git a/pint/models/pulsar_binary.py b/pint/models/pulsar_binary.py
index e606f1c27..b9bbb65ff 100644
--- a/pint/models/pulsar_binary.py
+++ b/pint/models/pulsar_binary.py
@@ -32,7 +32,6 @@ def __init__(self,):
             units=u.day,
             description="Orbital period", long_double=True))
 
-
         self.add_param(p.floatParameter(name="PBDOT",
             units = u.day/u.day,
             description="Orbital period derivitve respect to time", \
@@ -89,6 +88,11 @@ def __init__(self,):
 
     def setup(self):
         super(PulsarBinary, self).setup()
+
+        if self.T0.value is not None:
+            # set the units
+            self.T0.scale = self.UNITS.value.lower()
+
         for bpar in self.params:
             self.register_deriv_funcs(self.d_binary_delay_d_xxxx, bpar)
         # Setup the model isinstance
@@ -137,17 +141,21 @@ def update_binary_object(self, toas, acc_delay=None):
         """
         # Don't need to fill P0 and P1. Translate all the others to the format
         # that is used in bmodel.py
-        # Get barycnetric toa first
+        # Get barycentric toa first
         updates = {}
         tbl = toas.table
         if acc_delay is None:
             # If the accumulate delay is not provided, it will try to get
             # the barycentric correction.
             acc_delay = self.delay(toas, self.__class__.__name__, False)
-        self.barycentric_time = tbl['tdbld'] * u.day - acc_delay
+        if self.UNITS.value == 'TCB':
+            self.barycentric_time = tbl['tcbld'] * u.day - acc_delay
+            updates['psr_pos'] = self.ssb_to_psb_xyz_ICRS(epoch=tbl['tcbld'].astype(np.float64))
+        else:
+            self.barycentric_time = tbl['tdbld'] * u.day - acc_delay
+            updates['psr_pos'] = self.ssb_to_psb_xyz_ICRS(epoch=tbl['tdbld'].astype(np.float64))
         updates['barycentric_toa'] = self.barycentric_time
         updates['obs_pos'] = tbl['ssb_obs_pos'].quantity
-        updates['psr_pos'] = self.ssb_to_psb_xyz_ICRS(epoch=tbl['tdbld'].astype(np.float64))
         for par in self.binary_instance.binary_params:
             binary_par_names = [par,]
             if par in self.binary_instance.param_aliases.keys():
@@ -183,7 +191,7 @@ def binarymodel_delay(self, toas, acc_delay=None):
         return self.binary_instance.binary_delay()
 
     def d_binary_delay_d_xxxx(self, toas, param, acc_delay):
-        """Return the bianry model delay derivtives"""
+        """Return the binary model delay derivtives"""
         self.update_binary_object(toas, acc_delay)
         return self.binary_instance.d_binarydelay_d_par(param)
 
diff --git a/pint/models/spindown.py b/pint/models/spindown.py
index c1d4c0e70..6deb36b8f 100644
--- a/pint/models/spindown.py
+++ b/pint/models/spindown.py
@@ -44,6 +44,10 @@ def setup(self):
             if getattr(self, p).value is None:
                 raise MissingParameter("Spindown", p)
 
+        if self.PEPOCH.value is not None:
+            # set the units
+            self.PEPOCH.scale = self.UNITS.value.lower()
+
         # Check continuity
         F_terms = list(self.get_prefix_mapping_component('F').keys())
         F_terms.sort()
@@ -87,12 +91,20 @@ def get_dt(self, toas, delay):
         pulse phase will be handled at a higher level in the code.
         """
         tbl = toas.table
-        if self.PEPOCH.value is None:
-            phsepoch_ld = time_to_longdouble(tbl['tdb'][0] - delay[0])
+        if self.PEPOCH.scale == 'tcb':
+            if self.PEPOCH.value is None:
+                phsepoch_ld = time_to_longdouble(tbl['tcb'][0] - delay[0])
+            else:
+                phsepoch_ld = time_to_longdouble(self.PEPOCH.quantity)
+
+            dt = (tbl['tcbld'] - phsepoch_ld)*u.day - delay
         else:
-            phsepoch_ld = time_to_longdouble(self.PEPOCH.quantity)
+            if self.PEPOCH.value is None:
+                phsepoch_ld = time_to_longdouble(tbl['tdb'][0] - delay[0])
+            else:
+                phsepoch_ld = time_to_longdouble(self.PEPOCH.quantity)
 
-        dt = (tbl['tdbld'] - phsepoch_ld)*u.day - delay
+            dt = (tbl['tdbld'] - phsepoch_ld)*u.day - delay
 
         return dt
 
diff --git a/pint/models/timing_model.py b/pint/models/timing_model.py
index ffda084af..e6e43cd9c 100644
--- a/pint/models/timing_model.py
+++ b/pint/models/timing_model.py
@@ -63,8 +63,8 @@ class TimingModel(object):
         A list for register the timing model component type name. For example,
         delay components will be register as 'DelayComponent'.
     top_level_params : list
-        A parameter name list for thoes parameters belong to the top timing
-        model class rather than a specific component.
+        A parameter name list for those parameters that belong to the top
+        timing model class rather than a specific component.
 
     Properties
     ----------
@@ -96,7 +96,7 @@ def __init__(self, name='', components=[]):
         self.add_param_from_top(strParameter(name="EPHEM",
             description="Ephemeris to use"), '')
         self.add_param_from_top(strParameter(name="UNITS",
-            description="Units (TDB assumed)"), '')
+            description="Units", value="TDB"), '')  # defaults to TDB if not given
 
         self.setup_components(components)
 
@@ -378,7 +378,7 @@ def add_param_from_top(self, param, target_component):
         else:
             if target_component not in list(self.components.keys()):
                 raise AttributeError("Can not find component '%s' in "
-                                     "timging model." % target_component)
+                                     "timing model." % target_component)
             self.components[target_component].add_param(param)
 
     def remove_param(self, param):
@@ -424,6 +424,7 @@ def get_params_of_type(self, param_type):
                 param_type.upper() == par_prefix.upper():
                 result.append(par.name)
         return result
+
     def get_prefix_mapping(self, prefix):
         """Get the index mapping for the prefix parameters.
            Parameter
@@ -564,8 +565,6 @@ def noise_model_basis_weight(self, toas):
             result.append(nf(toas)[1])
         return np.hstack((r for r in result))
 
-
-
     def get_barycentric_toas(self, toas, cutoff_component=''):
         """This is a convenient function for calculate the barycentric TOAs.
            Parameter
@@ -587,7 +586,14 @@ def get_barycentric_toas(self, toas, cutoff_component=''):
                 if cp.category == 'pulsar_system':
                     cutoff_component = cp.__class__.__name__
         corr = self.delay(toas, cutoff_component, False)
-        return tbl['tdbld'] * u.day - corr
+
+        timescale = 'TDB' if not hasattr(self, 'UNITS') else getattr(self, 'UNITS').value
+        if timescale == 'TDB':
+            return tbl['tdbld'] * u.day - corr
+        elif timescale == 'TCB':
+            return tbl['tcbld'] * u.day - corr
+        else:
+            raise ValueError("Unknown 'UNITS' value")
 
     def d_phase_d_toa(self, toas, sample_step=None):
         """Return the derivative of phase wrt TOA
@@ -791,12 +797,18 @@ def read_parfile(self, filename):
 
             k = l.split()
             name = k[0].upper()
-            
-            if name == 'UNITS' and len(k) > 1 and k[1] != 'TDB':
-                log.error("UNITS %s not yet supported by PINT" % k[1])
-                raise Exception("UNITS %s not yet supported by PINT" % k[1])
 
-            
+            if name == 'UNITS' and len(k) > 1:
+                if k[1] != 'TDB' and k[1] != 'TCB' and k[1] != 'SI':
+                    log.error("UNITS {} not yet supported by "
+                              "PINT".format(k[1]))
+                    raise Exception("UNITS {} not yet supported by "
+                                    "PINT".format(k[1]))
+
+                if k[1] == 'SI':
+                    # SI is just an alias for TCB so set to 'TCB'
+                    k[1] = 'TCB'
+
             if name in checked_param:
                 if name in repeat_param.keys():
                     repeat_param[name] += 1
@@ -1042,6 +1054,10 @@ def is_in_parfile(self,para_dict):
         """
         pNames_inpar = list(para_dict.keys())
         pNames_inModel = self.params
+        
+        # remove UNITS as many components contain it
+        if 'UNITS' in pNames_inModel:
+            del pNames_inModel[pNames_inModel.index('UNITS')]
 
         # For solar system Shapiro delay component
         if hasattr(self,'PLANET_SHAPIRO'):
@@ -1085,6 +1101,7 @@ def print_par(self,):
             result += getattr(self, p).as_parfile_line()
         return result
 
+
 class DelayComponent(Component):
     def __init__(self,):
         super(DelayComponent, self).__init__()
diff --git a/pint/models/wave.py b/pint/models/wave.py
index 5556a9616..205c9e384 100644
--- a/pint/models/wave.py
+++ b/pint/models/wave.py
@@ -33,6 +33,7 @@ def setup(self):
                                        "WAVE_OM is set.")
             else:
                 self.WAVEEPOCH = self.PEPOCH
+            self.WAVEEPOCH.scale = self.UNITS.value.lower()
 
         wave_terms = list(self.get_prefix_mapping_component('WAVE').keys())
         wave_terms.sort()
@@ -62,7 +63,10 @@ def wave_delay(self, toas, acc_delay=None):
                       range(1, self.num_wave_terms + 1)]
         wave_terms = [getattr(self, name) for name in wave_names]
         wave_om = self.WAVE_OM.quantity
-        time = self.barycentric_time = toas.table['tdbld'] * u.day
+        if self.UNITS.value == 'TCB':
+            time = self.barycentric_time = toas.table['tcbld'] * u.day
+        else:
+            time = self.barycentric_time = toas.table['tdbld'] * u.day
         for k, wave_term in enumerate(wave_terms):
             wave_a, wave_b = wave_term.quantity
             k = k + 1
diff --git a/pint/observatory/observatory.py b/pint/observatory/observatory.py
index c182908b3..50122b1f9 100644
--- a/pint/observatory/observatory.py
+++ b/pint/observatory/observatory.py
@@ -44,10 +44,12 @@ def __new__(cls, name, *args, **kwargs):
         cls._register(obs, name)
         return obs
 
-    def __init__(self,name,aliases=None,tt2tdb_mode='pint'):
+    def __init__(self, name, aliases=None, tt2tdb_mode='pint',
+                 tt2tcb_mode='pint'):
         if aliases is not None:
             Observatory._add_aliases(self,aliases)
         self.tt2tdb_mode = tt2tdb_mode
+        self.tt2tcb_mode = tt2tcb_mode
 
     @classmethod
     def _register(cls,obs,name):
@@ -171,7 +173,7 @@ def get_TDBs(self, t,  method='default', ephem=None, options=None, grp=None):
                     Also uses topocentric correction term if self.tt2tdbmethod is
                     pint.
                 - 'ephemeris': JPL ephemeris included TDB-TT correction.
-            ephme: str, optional
+            ephem: str, optional
                 The ephemeris to get he TDB-TT correction. Required for the
                 'ephemeris' method.
         """
@@ -237,6 +239,87 @@ def _get_TDB_ephem(self, t, ephem):
         """
         raise NotImplementedError
 
+    def get_TCBs(self, t,  method='default', ephem=None, options=None, grp=None):
+        """This is a high level function for converting TOAs to TCB time scale.
+            Different method can be applied to obtain the result. Current supported
+            methods are ['astropy', 'ephemeris']
+            Parameters
+            ----------
+            t: astropy.time.Time object
+                The time need for converting toas
+            method: str or callable, optional
+                Method of computing TCB
+
+                - 'default': Astropy time.Time object built-in converter, use FB90.
+                    Also uses topocentric correction term if self.tt2tcbmethod is
+                    pint.
+                - 'ephemeris': JPL ephemeris included TCB-TT correction.
+            ephem: str, optional
+                The ephemeris to get the TCB-TT correction. Required for the
+                'ephemeris' method.
+        """
+
+        if t.isscalar: t = Time([t])
+        if t.scale == 'tcb':
+            return t
+        # Check the method. This pattern is from numpy minize
+        if callable(method):
+            meth = "_custom"
+        else:
+            meth = method.lower()
+        if options is None:
+            options = {}
+        if meth == "_custom":
+            options = dict(options)
+            return method(t, **options)
+        if meth == 'default':
+            if self.tt2tcb_mode.lower().startswith('astropy'):
+                log.info('Doing astropy mode TCB conversion')
+                return self._get_TCB_astropy(t)
+            elif self.tt2tcb_mode.lower().startswith('pint'):
+                log.info('Doing PINT mode TCB conversion')
+                if ephem is None:
+                    raise ValueError("A ephemeris file should be provided to get"
+                                     " the TCB-TT corrections, or use tt2tcb_mode=astropy")
+                return self._get_TCB_PINT(t, ephem, grp)
+        elif meth == "ephemeris":
+            if ephem is None:
+                raise ValueError("A ephemeris file should be provided to get"
+                                 " the TCB-TT corrections.")
+            return self._get_TCB_ephem(t, ephem)
+        else:
+            raise ValueError("Unknown method '%s'." % method)
+
+    def _get_TCB_astropy(self, t):
+        return t.tcb
+
+    def _get_TCB_PINT(self, t, ephem, grp=None):
+        """Uses astropy.Time location to add the topocentric correction term to
+            the Time object. The topocentric correction is given as (r/c).(v/c),
+            with r equal to the geocentric position of the observer, v being the
+            barycentric velocity of the earth, and c being the speed of light.
+
+            The geocentric observer position can be obtained from Time object.
+            The barycentric velocity can be obtained using solar_system_ephemerides
+            objPosVel_wrt_SSB
+        """
+
+        #Add in correction term to t.tdb equal to r.v / c^2
+        vel = sse.objPosVel_wrt_SSB('earth', t, ephem).vel
+        pos = self.get_gcrs(t, ephem=ephem, grp=grp)
+        dnom = const.c * const.c 
+
+        corr = ((pos[0] * vel[0] + pos[1] * vel[1] + pos[2] * vel[2])/dnom).to(u.s)
+        log.debug('\tTopocentric Correction:\t%s' % corr)
+
+        return t.tcb + corr
+
+    def _get_TCB_ephem(self, t, ephem):
+        """This is a function that reads the ephem TCB-TT column. This column is
+            provided by DE4XXt version of ephemeris.
+        """
+        raise NotImplementedError
+
     def posvel(self,t,ephem):
         """Returns observatory position and velocity relative to solar system
         barycenter for the given times (astropy array-valued Time objects)."""
diff --git a/pint/observatory/topo_obs.py b/pint/observatory/topo_obs.py
index 415dde850..2dbbfb832 100644
--- a/pint/observatory/topo_obs.py
+++ b/pint/observatory/topo_obs.py
@@ -112,7 +112,8 @@ def __init__(self, name, tempo_code=None, itoa_code=None, aliases=None,
         for code in (tempo_code, itoa_code):
             if code is not None: aliases.append(code)
 
-        super(TopoObs,self).__init__(name,aliases=aliases, tt2tdb_mode='astropy')
+        super(TopoObs,self).__init__(name, aliases=aliases, tt2tdb_mode='astropy',
+                                     tt2tcb_mode='astropy')
 
     @property
     def clock_fullpath(self):
diff --git a/pint/toa.py b/pint/toa.py
index 88d67238d..4fa21f658 100644
--- a/pint/toa.py
+++ b/pint/toa.py
@@ -32,7 +32,7 @@
 
 def get_TOAs(timfile, ephem=None, include_bipm=True, bipm_version='BIPM2015',
              include_gps=True, planets=False, usepickle=False,
-             tdb_method="default"):
+             tdb_method="default", tcb_method="default"):
     """Convenience function to load and prepare TOAs for PINT use.
 
     Loads TOAs from a '.tim' file, applies clock corrections, computes
@@ -59,6 +59,8 @@ def get_TOAs(timfile, ephem=None, include_bipm=True, bipm_version='BIPM2015',
                                   bipm_version=bipm_version)
     if 'tdb' not in t.table.colnames:
         t.compute_TDBs(method=tdb_method, ephem=ephem)
+    if 'tcb' not in t.table.colnames:
+        t.compute_TCBs(method=tcb_method, ephem=ephem)
     if 'ssb_obs_pos' not in t.table.colnames:
         t.compute_posvels(ephem, planets)
     # Update pickle if needed:
@@ -101,7 +103,7 @@ def _check_pickle(toafilename, picklefilename=None):
 
 def get_TOAs_list(toa_list,ephem=None, include_bipm=True,
                   bipm_version='BIPM2015', include_gps=True, planets=False,
-                  tdb_method="default"):
+                  tdb_method="default", tcb_method="default"):
     """Load TOAs from a list of TOA objects.
 
     Compute the TDB time and observatory positions and velocity
@@ -119,6 +121,8 @@ def get_TOAs_list(toa_list,ephem=None, include_bipm=True,
                                   bipm_version=bipm_version)
     if 'tdb' not in t.table.colnames:
         t.compute_TDBs(method=tdb_method, ephem=ephem)
+    if 'tcb' not in t.table.colnames:
+        t.compute_TCBs(method=tcb_method, ephem=ephem)
     if 'ssb_obs_pos' not in t.table.colnames:
         t.compute_posvels(ephem, planets)
     return t
@@ -688,6 +692,7 @@ def adjust_TOAs(self, delta):
         # Changed high_precision from False to True to avoid self referential get_mjds()
         self.table['mjd_float'] = [t.mjd for t in self.get_mjds(high_precision=True)] * u.day
         self.compute_TDBs()
+        self.compute_TCBs()
         self.compute_posvels(self.ephem, self.planets)
 
     def write_TOA_file(self,filename,name='pint', format='Princeton'):
@@ -871,6 +876,72 @@ def compute_TDBs(self, method="default", ephem=None):
                 data=[utils.time_to_longdouble(t) for t in tdbs])
         self.table.add_columns([col_tdb, col_tdbld])
 
+    def compute_TCBs(self, method="default", ephem=None):
+        """Compute and add TCB and TCB long double columns to the TOA table.
+        This routine creates new columns 'tcb' and 'tcbld' in a TOA table
+        for TCB times, using the Observatory locations and IERS A Earth
+        rotation corrections for UT1.
+        """
+        log.info('Computing TCB columns.')
+        if 'tcb' in self.table.colnames:
+            log.info('tcb column already exists. Deleting...')
+            self.table.remove_column('tcb')
+        if 'tcbld' in self.table.colnames:
+            log.info('tcbld column already exists. Deleting...')
+            self.table.remove_column('tcbld')
+
+        if ephem is None:
+            if self.ephem is not None:
+                ephem = self.ephem
+            else:
+                log.warning('No ephemeris provided to TOAs object or compute_TCBs. Using DE421')
+                ephem = 'DE421'
+        else:
+            # If user specifies an ephemeris, make sure it is the same as the one already in the TOA object, to prevent mixing.
+            if (self.ephem is not None) and (ephem != self.ephem):
+                log.error('Ephemeris provided to compute_TCBs {0} is different than TOAs object ephemeris {1}!'.format(ephem,self.ephem))
+        self.ephem = ephem
+
+        # Compute in observatory groups
+        tcbs = numpy.zeros_like(self.table['mjd'])
+        for ii, key in enumerate(self.table.groups.keys):
+            grp = self.table.groups[ii]
+            obs = self.table.groups.keys[ii]['obs']
+            loind, hiind = self.table.groups.indices[ii:ii+2]
+            site = get_observatory(obs)
+            if isinstance(site, TopoObs):
+                # For TopoObs, it is safe to assume that all TOAs have same location
+                # I think we should report to astropy that initializing
+                # a Time from a list (or Column) of Times throws away the location information
+                grpmjds = time.Time(grp['mjd'], location=grp['mjd'][0].location)
+            else:
+                # Grab locations for each TOA
+                # It is crazy that I have to deconstruct the locations like
+                # this to build a single EarthLocation object with an array
+                # of locations contained in it.
+                # Is there a more efficient way to convert a list of EarthLocations
+                # into a single EarthLocation object with an array of values internally?
+                loclist = [t.location for t in grp['mjd']]
+                if loclist[0] is None:
+                    grpmjds = time.Time(grp['mjd'],location=None)
+                else:
+                    locs = EarthLocation(numpy.array([l.x.value for l in loclist])*u.m,
+                                         numpy.array([l.y.value for l in loclist])*u.m,
+                                         numpy.array([l.z.value for l in loclist])*u.m)
+                    grpmjds = time.Time(grp['mjd'],location=locs)
+
+            if isinstance(site, SpacecraftObs): #spacecraft-topocentric toas
+                grptcbs = site.get_TCBs(grpmjds, method=method, ephem=ephem, grp=grp)
+            else:
+                grptcbs = site.get_TCBs(grpmjds, method=method, ephem=ephem)
+            tcbs[loind:hiind] = numpy.asarray([t for t in grptcbs])
+
+        # Now add the new columns to the table
+        col_tcb = table.Column(name='tcb', data=tcbs)
+        col_tcbld = table.Column(name='tcbld',
+                data=[utils.time_to_longdouble(t) for t in tcbs])
+        self.table.add_columns([col_tcb, col_tcbld])
+
     def compute_posvels(self, ephem=None, planets=False):
         """Compute positions and velocities of the observatories and Earth.
 

From 487f173a6d7eceba1e9ece08d14cbf9ebf151c98 Mon Sep 17 00:00:00 2001
From: Matthew Pitkin <matthew.pitkin@ligo.org>
Date: Tue, 19 Feb 2019 22:08:53 +0000
Subject: [PATCH 2/4] Tidy up code by removing if statements when selecting
 time from table

 - fix missing tcb conversion in glitch.py
---
 pint/models/astrometry.py            | 15 +++------------
 pint/models/dispersion_model.py      | 20 ++++----------------
 pint/models/glitch.py                | 15 ++++++++-------
 pint/models/noise_model.py           |  4 ++--
 pint/models/pulsar_binary.py         |  8 ++------
 pint/models/solar_system_shapiro.py  |  2 +-
 pint/models/solar_wind_dispersion.py |  4 ++--
 pint/models/spindown.py              | 16 ++++------------
 pint/models/timing_model.py          |  6 ++----
 pint/models/wave.py                  |  6 ++----
 10 files changed, 30 insertions(+), 66 deletions(-)

diff --git a/pint/models/astrometry.py b/pint/models/astrometry.py
index 08ecef031..7490743bc 100644
--- a/pint/models/astrometry.py
+++ b/pint/models/astrometry.py
@@ -53,10 +53,7 @@ def ssb_to_psb_xyz_ICRS(self, epoch=None):
     def barycentric_radio_freq(self, toas):
         """Return radio frequencies (MHz) of the toas corrected for Earth motion"""
         tbl = toas.table
-        if self.UNITS.value == 'TCB':
-            L_hat = self.ssb_to_psb_xyz_ICRS(epoch=tbl['tcbld'].astype(numpy.float64))
-        else:
-            L_hat = self.ssb_to_psb_xyz_ICRS(epoch=tbl['tdbld'].astype(numpy.float64))
+        L_hat = self.ssb_to_psb_xyz_ICRS(epoch=tbl[self.UNITS.value.lower()+'ld'].astype(numpy.float64))
         v_dot_L_array = numpy.sum(tbl['ssb_obs_vel']*L_hat, axis=1)
         return tbl['freq'] * (1.0 - v_dot_L_array / const.c)
 
@@ -68,10 +65,7 @@ def solar_system_geometric_delay(self, toas, acc_delay=None):
         available as 3-vector toa.xyz, in units of light-seconds.
         """
         tbl = toas.table
-        if self.UNITS.value == 'TCB':
-            L_hat = self.ssb_to_psb_xyz_ICRS(epoch=tbl['tcbld'].astype(numpy.float64))
-        else:
-            L_hat = self.ssb_to_psb_xyz_ICRS(epoch=tbl['tdbld'].astype(numpy.float64))
+        L_hat = self.ssb_to_psb_xyz_ICRS(epoch=tbl[self.UNITS.value.lower()+'ld'].astype(numpy.float64))
         re_dot_L = numpy.sum(tbl['ssb_obs_pos']*L_hat, axis=1)
         delay = -re_dot_L.to(ls).value
         if self.PX.value != 0.0 \
@@ -93,10 +87,7 @@ def get_d_delay_quantities(self, toas):
         # TODO: tbl['tdbld'].quantity should have units of u.day
         # NOTE: Do we need to include the delay here?
         tbl = toas.table
-        if self.UNITS.value == 'TCB':
-            rd['epoch'] = tbl['tcbld'].quantity * u.day #- delay * u.second
-        else:
-            rd['epoch'] = tbl['tdbld'].quantity * u.day #- delay * u.second
+        rd['epoch'] = tbl[self.UNITS.value.lower()+'ld'].quantity * u.day #- delay * u.second
 
         # Distance from SSB to observatory, and from SSB to psr
         ssb_obs = tbl['ssb_obs_pos'].quantity
diff --git a/pint/models/dispersion_model.py b/pint/models/dispersion_model.py
index b6afba0c7..50086dbca 100644
--- a/pint/models/dispersion_model.py
+++ b/pint/models/dispersion_model.py
@@ -107,16 +107,10 @@ def base_dm(self, toas):
         dm = np.zeros(len(tbl))
         dm_terms = self.get_DM_terms()
         if self.DMEPOCH.value is None:
-            if self.UNITS.value == 'TCB':
-                DMEPOCH = tbl['tcbld'][0]
-            else:
-                DMEPOCH = tbl['tdbld'][0]
+            DMEPOCH = tbl[self.UNITS.value.lower()+'ld'][0]
         else:
             DMEPOCH = self.DMEPOCH.value
-        if self.UNITS.value == 'TCB':
-            dt = (tbl['tcbld'] - DMEPOCH) * u.day
-        else:
-            dt = (tbl['tdbld'] - DMEPOCH) * u.day
+        dt = (tbl[self.UNITS.value.lower()+'ld'] - DMEPOCH) * u.day
         dt_value = (dt.to(u.yr)).value
         dm_terms_value = [d.value for d in dm_terms]
         dm = taylor_horner(dt_value, dm_terms_value)
@@ -164,16 +158,10 @@ def d_delay_d_DMs(self, toas, param_name, acc_delay=None): # NOTE we should have
         dm_terms = np.longdouble(np.zeros(len(dms)))
         dm_terms[order] = np.longdouble(1.0)
         if self.DMEPOCH.value is None:
-            if self.UNITS.value == 'TCB':
-                DMEPOCH = tbl['tcbld'][0]
-            else:
-                DMEPOCH = tbl['tdbld'][0]
+            DMEPOCH = tbl[self.UNITS.value.lower()+'ld'][0]
         else:
             DMEPOCH = self.DMEPOCH.value
-        if self.UNITS.value == 'TCB':
-            dt = (tbl['tcbld'] - DMEPOCH) * u.day
-        else:
-            dt = (tbl['tdbld'] - DMEPOCH) * u.day
+        dt = (tbl[self.UNITS.value.lower()+'ld'] - DMEPOCH) * u.day
         dt_value = (dt.to(u.yr)).value
         d_dm_d_dm_param = taylor_horner(dt_value, dm_terms)* (self.DM.units/par.units)
         return DMconst * d_dm_d_dm_param/ bfreq**2.0
diff --git a/pint/models/glitch.py b/pint/models/glitch.py
index 75ce37a8e..d7ac10840 100644
--- a/pint/models/glitch.py
+++ b/pint/models/glitch.py
@@ -76,6 +76,7 @@ def setup(self):
             if not hasattr(self, 'GLEP_%d' % idx):
                 msg = 'Glicth Epoch is needed for Glicth %d.' % idx
                 raise MissingParameter("Glitch", 'GLEP_%d' % idx, msg)
+            getattr(self, 'GLEP_%d' % idx).scale = self.UNITS.value.lower()
             for param in self.glitch_prop:
                 if not hasattr(self, param + '%d' % idx):
                     param0 = getattr(self, param + '1')
@@ -121,7 +122,7 @@ def glitch_phase(self, toas, delay):
                 dF0 = getattr(self, "GLF0_%d" % idx).quantity
                 dF1 = getattr(self, "GLF1_%d" % idx).quantity
                 dF2 = getattr(self, "GLF2_%d" % idx).quantity
-                dt = (tbl['tdbld'] - eph) * u.day - delay
+                dt = (tbl[self.UNITS.value.lower()+'ld'] - eph) * u.day - delay
                 dt = dt.to(u.second)
                 affected = dt > 0.0  # TOAs affected by glitch
                 # decay term
@@ -146,7 +147,7 @@ def d_phase_d_GLPH(self, toas, param, delay):
             raise ValueError("Can not calculate d_phase_d_GLPH with respect to %s." % param)
         eph = time_to_longdouble(getattr(self, "GLEP_" + ids).value)
         par_GLPH = getattr(self, param)
-        dt = (tbl['tdbld'] - eph) * u.day - delay
+        dt = (tbl[self.UNITS.value.lower()+'ld'] - eph) * u.day - delay
         dt = dt.to(u.second)
         affected = numpy.where(dt > 0.0)[0]
         dpdGLPH = numpy.zeros(len(tbl), dtype=numpy.longdouble) * u.cycle/par_GLPH.units
@@ -163,7 +164,7 @@ def d_phase_d_GLF0(self, toas, param, delay):
             raise ValueError("Can not calculate d_phase_d_GLF0 with respect to %s." % param)
         eph = time_to_longdouble(getattr(self, "GLEP_" + ids).value)
         par_GLF0 = getattr(self, param)
-        dt = (tbl['tdbld'] - eph) * u.day - delay
+        dt = (tbl[self.UNITS.value.lower()+'ld'] - eph) * u.day - delay
         dt = dt.to(u.second)
         affected = numpy.where(dt > 0.0)[0]
         dpdGLF0 = numpy.zeros(len(tbl), dtype=numpy.longdouble) * u.cycle/par_GLF0.units
@@ -179,7 +180,7 @@ def d_phase_d_GLF1(self, toas,  param, delay):
             raise ValueError("Can not calculate d_phase_d_GLF1 with respect to %s." % param)
         eph = time_to_longdouble(getattr(self, "GLEP_" + ids).value)
         par_GLF1 = getattr(self, param)
-        dt = (tbl['tdbld'] - eph) * u.day - delay
+        dt = (tbl[self.UNITS.value.lower()+'ld'] - eph) * u.day - delay
         dt = dt.to(u.second)
         affected = numpy.where(dt > 0.0)[0]
         dpdGLF1 = numpy.zeros(len(tbl), dtype=numpy.longdouble) * u.cycle/par_GLF1.units
@@ -195,7 +196,7 @@ def d_phase_d_GLF2(self, toas,  param, delay):
             raise ValueError("Can not calculate d_phase_d_GLF2 with respect to %s." % param)
         eph = time_to_longdouble(getattr(self, "GLEP_" + ids).value)
         par_GLF2 = getattr(self, param)
-        dt = (tbl['tdbld'] - eph) * u.day - delay
+        dt = (tbl[self.UNITS.value.lower()+'ld'] - eph) * u.day - delay
         dt = dt.to(u.second)
         affected = numpy.where(dt > 0.0)[0]
         dpdGLF2 = numpy.zeros(len(tbl), dtype=numpy.longdouble) * u.cycle/par_GLF2.units
@@ -213,7 +214,7 @@ def d_phase_d_GLF0D(self, toas, param, delay):
         eph = time_to_longdouble(getattr(self, "GLEP_" + ids).value)
         par_GLF0D = getattr(self, param)
         tau = getattr(self, "GLTD_%d" % idv).quantity
-        dt = (tbl['tdbld'] - eph) * u.day - delay
+        dt = (tbl[self.UNITS.value.lower()+'ld'] - eph) * u.day - delay
         dt = dt.to(u.second)
         affected = numpy.where(dt > 0.0)[0]
         dpdGLF0D = numpy.zeros(len(tbl), dtype=numpy.longdouble) * u.cycle/par_GLF0D.units
@@ -235,7 +236,7 @@ def d_phase_d_GLTD(self, toas, param, delay):
             return numpy.zeros(len(tbl), dtype=numpy.longdouble) * u.cycle/par_GLTD.units
         glf0d = getattr(self, 'GLF0D_'+ids).quantity
         tau = par_GLTD.quantity
-        dt = (tbl['tdbld'] - eph) * u.day - delay
+        dt = (tbl[self.UNITS.value.lower()+'ld'] - eph) * u.day - delay
         dt = dt.to(u.second)
         affected = numpy.where(dt > 0.0)[0]
         dpdGLTD = numpy.zeros(len(tbl), dtype=numpy.longdouble) * u.cycle/par_GLTD.units
diff --git a/pint/models/noise_model.py b/pint/models/noise_model.py
index fd991233a..ba454adda 100644
--- a/pint/models/noise_model.py
+++ b/pint/models/noise_model.py
@@ -181,7 +181,7 @@ def ecorr_basis_weight_pair(self, toas):
 
         """
         tbl = toas.table
-        t = (tbl['tdbld'].quantity * u.day).to(u.s).value
+        t = (tbl[self.UNITS.value.lower()+'ld'].quantity * u.day).to(u.s).value
         ecorrs = self.get_ecorrs()
         Umats = []
         for ec in ecorrs:
@@ -263,7 +263,7 @@ def pl_rn_basis_weight_pair(self, toas):
 
         """
         tbl = toas.table
-        t = (tbl['tdbld'].quantity * u.day).to(u.s).value
+        t = (tbl[self.UNITS.value.lower()+'ld'].quantity * u.day).to(u.s).value
         amp, gam, nf = self.get_pl_vals()
         Fmat, f = create_fourier_design_matrix(t, nf)
         weight = powerlaw(f, amp, gam) * f[0]
diff --git a/pint/models/pulsar_binary.py b/pint/models/pulsar_binary.py
index b9bbb65ff..3c482714e 100644
--- a/pint/models/pulsar_binary.py
+++ b/pint/models/pulsar_binary.py
@@ -148,12 +148,8 @@ def update_binary_object(self, toas, acc_delay=None):
             # If the accumulate delay is not provided, it will try to get
             # the barycentric correction.
             acc_delay = self.delay(toas, self.__class__.__name__, False)
-        if self.UNITS.value == 'TCB':
-            self.barycentric_time = tbl['tcbld'] * u.day - acc_delay
-            updates['psr_pos'] = self.ssb_to_psb_xyz_ICRS(epoch=tbl['tcbld'].astype(np.float64))
-        else:
-            self.barycentric_time = tbl['tdbld'] * u.day - acc_delay
-            updates['psr_pos'] = self.ssb_to_psb_xyz_ICRS(epoch=tbl['tdbld'].astype(np.float64))
+        self.barycentric_time = tbl[self.UNITS.value.lower()+'ld'] * u.day - acc_delay
+        updates['psr_pos'] = self.ssb_to_psb_xyz_ICRS(epoch=tbl[self.UNITS.value.lower()+'ld'].astype(np.float64))
         updates['barycentric_toa'] = self.barycentric_time
         updates['obs_pos'] = tbl['ssb_obs_pos'].quantity
         for par in self.binary_instance.binary_params:
diff --git a/pint/models/solar_system_shapiro.py b/pint/models/solar_system_shapiro.py
index 256df2df4..7fde460ab 100644
--- a/pint/models/solar_system_shapiro.py
+++ b/pint/models/solar_system_shapiro.py
@@ -78,7 +78,7 @@ def solar_system_shapiro_delay(self, toas, acc_delay=None):
             if key['obs'].lower() == 'barycenter':
                 log.debug("Skipping Shapiro delay for Barycentric TOAs")
                 continue
-            psr_dir = self.ssb_to_psb_xyz_ICRS(epoch=grp['tdbld'].astype(numpy.float64))
+            psr_dir = self.ssb_to_psb_xyz_ICRS(epoch=grp[self.UNITS.value.lower()+'ld'].astype(numpy.float64))
             delay[loind:hiind] += self.ss_obj_shapiro_delay(grp['obs_sun_pos'],
                                     psr_dir, self._ss_mass_sec['sun'])
             if self.PLANET_SHAPIRO.value:
diff --git a/pint/models/solar_wind_dispersion.py b/pint/models/solar_wind_dispersion.py
index 3f47d5467..3545be36b 100644
--- a/pint/models/solar_wind_dispersion.py
+++ b/pint/models/solar_wind_dispersion.py
@@ -42,7 +42,7 @@ def solar_wind_delay(self, toas, acc_delay=None):
                 bfreq = tbl['freq']
 
             rsa = tbl['obs_sun_pos'].quantity
-            pos = self.ssb_to_psb_xyz_ICRS(epoch=tbl['tdbld'].astype(np.float64))
+            pos = self.ssb_to_psb_xyz_ICRS(epoch=tbl[self.UNITS.value.lower()+'ld'].astype(np.float64))
             r = np.sqrt(np.sum(rsa*rsa, axis=1))
             cos_theta = np.sum(rsa*pos, axis=1) / r
             ret =  const.au**2.0 * np.arccos(cos_theta) * DMconst * self.NE_SW.quantity / \
@@ -63,7 +63,7 @@ def d_delay_d_ne_sw(self, toas, param_name, acc_delay=None):
                 bfreq = tbl['freq']
 
             rsa = tbl['obs_sun_pos'].quantity
-            pos = self.ssb_to_psb_xyz_ICRS(epoch=tbl['tdbld'].astype(np.float64))
+            pos = self.ssb_to_psb_xyz_ICRS(epoch=tbl[self.UNITS.value.lower()+'ld'].astype(np.float64))
             r = np.sqrt(np.sum(rsa*rsa, axis=1))
             cos_theta = np.sum(rsa*pos, axis=1) / r
             
diff --git a/pint/models/spindown.py b/pint/models/spindown.py
index 6deb36b8f..4d64bcdef 100644
--- a/pint/models/spindown.py
+++ b/pint/models/spindown.py
@@ -91,20 +91,12 @@ def get_dt(self, toas, delay):
         pulse phase will be handled at a higher level in the code.
         """
         tbl = toas.table
-        if self.PEPOCH.scale == 'tcb':
-            if self.PEPOCH.value is None:
-                phsepoch_ld = time_to_longdouble(tbl['tcb'][0] - delay[0])
-            else:
-                phsepoch_ld = time_to_longdouble(self.PEPOCH.quantity)
-
-            dt = (tbl['tcbld'] - phsepoch_ld)*u.day - delay
+        if self.PEPOCH.value is None:
+            phsepoch_ld = time_to_longdouble(tbl[self.UNITS.value.lower()][0] - delay[0])
         else:
-            if self.PEPOCH.value is None:
-                phsepoch_ld = time_to_longdouble(tbl['tdb'][0] - delay[0])
-            else:
-                phsepoch_ld = time_to_longdouble(self.PEPOCH.quantity)
+            phsepoch_ld = time_to_longdouble(self.PEPOCH.quantity)
 
-            dt = (tbl['tdbld'] - phsepoch_ld)*u.day - delay
+        dt = (tbl[self.UNITS.value.lower()+'ld'] - phsepoch_ld)*u.day - delay
 
         return dt
 
diff --git a/pint/models/timing_model.py b/pint/models/timing_model.py
index e6e43cd9c..5eb831283 100644
--- a/pint/models/timing_model.py
+++ b/pint/models/timing_model.py
@@ -588,10 +588,8 @@ def get_barycentric_toas(self, toas, cutoff_component=''):
         corr = self.delay(toas, cutoff_component, False)
 
         timescale = 'TDB' if not hasattr(self, 'UNITS') else getattr(self, 'UNITS').value
-        if timescale == 'TDB':
-            return tbl['tdbld'] * u.day - corr
-        elif timescale == 'TCB':
-            return tbl['tcbld'] * u.day - corr
+        if timescale in ['TDB', 'TCB']:
+            return tbl[timescale.lower()+'ld'] * u.day - corr
         else:
             raise ValueError("Unknown 'UNITS' value")
 
diff --git a/pint/models/wave.py b/pint/models/wave.py
index 205c9e384..604c9022d 100644
--- a/pint/models/wave.py
+++ b/pint/models/wave.py
@@ -63,10 +63,8 @@ def wave_delay(self, toas, acc_delay=None):
                       range(1, self.num_wave_terms + 1)]
         wave_terms = [getattr(self, name) for name in wave_names]
         wave_om = self.WAVE_OM.quantity
-        if self.UNITS.value == 'TCB':
-            time = self.barycentric_time = toas.table['tcbld'] * u.day
-        else:
-            time = self.barycentric_time = toas.table['tdbld'] * u.day
+        time = self.barycentric_time = toas.table[self.UNITS.value.lower()+'ld'] * u.day
+
         for k, wave_term in enumerate(wave_terms):
             wave_a, wave_b = wave_term.quantity
             k = k + 1

From 1f33b9a32f0ae216b908cf5da5d4bac83cefdaa0 Mon Sep 17 00:00:00 2001
From: Matthew Pitkin <matthew.pitkin@ligo.org>
Date: Tue, 19 Feb 2019 22:58:02 +0000
Subject: [PATCH 3/4] Add a test of the TCB implementation

---
 pint/scripts/pintempo.py         |   2 +-
 tests/datafile/test_TCB.par      |  26 +++
 tests/datafile/test_TCB.simulate | 368 +++++++++++++++++++++++++++++++
 tests/test_pintempo2tcb.py       |  42 ++++
 4 files changed, 437 insertions(+), 1 deletion(-)
 create mode 100644 tests/datafile/test_TCB.par
 create mode 100644 tests/datafile/test_TCB.simulate
 create mode 100644 tests/test_pintempo2tcb.py

diff --git a/pint/scripts/pintempo.py b/pint/scripts/pintempo.py
index acf8b081a..9344ad04d 100755
--- a/pint/scripts/pintempo.py
+++ b/pint/scripts/pintempo.py
@@ -35,7 +35,7 @@ def main(argv=None):
     log.warning(m.params)
 
     log.info("Reading TOAs")
-    t = pint.toa.get_TOAs(args.timfile)
+    t = pint.toa.get_TOAs(args.timfile, ephem=m.EPHEM.value)
     prefit_resids = pint.residuals.resids(t, m).time_resids
 
     log.info("Fitting...")
diff --git a/tests/datafile/test_TCB.par b/tests/datafile/test_TCB.par
new file mode 100644
index 000000000..409e33d7d
--- /dev/null
+++ b/tests/datafile/test_TCB.par
@@ -0,0 +1,26 @@
+PSRJ     J1010+2020
+RAJ      10:10:54.21
+DECJ     20:20:01.05
+PMRA     12.3
+PMDEC    -9.8
+POSEPOCH 56789
+DM       101.1
+DMEPOCH  56789
+F0       19.67297587421
+F1       -5.48585e-12
+PEPOCH   56789
+BINARY   BT
+ECC      0.0001
+T0       57123
+A1       23.4
+PB       10.0
+OM       98.7
+GLEP_1   57000
+GLPH_1   0
+GLF0_1   8.7e-07
+GLF1_1   -6.6e-15
+TZRMJD   56990
+TZRFRQ   1414
+TZRSITE  ao
+EPHEM    DE405
+UNITS    TCB
diff --git a/tests/datafile/test_TCB.simulate b/tests/datafile/test_TCB.simulate
new file mode 100644
index 000000000..93f3d7eca
--- /dev/null
+++ b/tests/datafile/test_TCB.simulate
@@ -0,0 +1,368 @@
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+ fake.rf 1440.00000000 57280.03292257038605584 0.00001 7 
+ fake.rf 1440.00000000 57281.03019208111812333 0.00001 7 
+ fake.rf 1440.00000000 57282.02746183040078520 0.00001 7 
+ fake.rf 1440.00000000 57283.02473153772562853 0.00001 7 
+ fake.rf 1440.00000000 57284.02200060900075584 0.00001 7 
+ fake.rf 1440.00000000 57285.01927058885709343 0.00001 7 
+ fake.rf 1440.00000000 57286.01653996185663331 0.00001 7 
+ fake.rf 1440.00000000 57287.01380962282782860 0.00001 7 
+ fake.rf 1440.00000000 57288.01107904123371739 0.00001 7 
+ fake.rf 1440.00000000 57289.00834869043872999 0.00001 7 
+ fake.rf 1440.00000000 57290.00561810650287242 0.00001 7 
+ fake.rf 1440.00000000 57291.00288798244937638 0.00001 7 
+ fake.rf 1440.00000000 57292.00015743340255625 0.00001 7 
+ fake.rf 1440.00000000 57292.99742718936644792 0.00001 7 
+ fake.rf 1440.00000000 57293.99469677927796951 0.00001 7 
+ fake.rf 1440.00000000 57294.99196620859991924 0.00001 7 
+ fake.rf 1440.00000000 57295.98923582928494724 0.00001 7 
+ fake.rf 1440.00000000 57296.98650493631698311 0.00001 7 
+ fake.rf 1440.00000000 57297.98377492667787436 0.00001 7 
+ fake.rf 1440.00000000 57298.98104438278852868 0.00001 7 
+ fake.rf 1440.00000000 57299.97831379173643285 0.00001 7 
+ fake.rf 1440.00000000 57300.97558375086696714 0.00001 7 
+ fake.rf 1440.00000000 57301.97285322432429666 0.00001 7 
+ fake.rf 1440.00000000 57302.97012279387010736 0.00001 7 
+ fake.rf 1440.00000000 57303.96739212330471602 0.00001 7 
+ fake.rf 1440.00000000 57304.96466203369981685 0.00001 7 
+ fake.rf 1440.00000000 57305.96193120809508414 0.00001 7 
+ fake.rf 1440.00000000 57306.95920085964234048 0.00001 7 
+ fake.rf 1440.00000000 57307.95647018625969693 0.00001 7 
+ fake.rf 1440.00000000 57308.95373999642065144 0.00001 7 
+ fake.rf 1440.00000000 57309.95100938492067755 0.00001 7 
+ fake.rf 1440.00000000 57310.94827887215535611 0.00001 7 
+ fake.rf 1440.00000000 57311.94554847039643164 0.00001 7 
+ fake.rf 1440.00000000 57312.94281804337569142 0.00001 7 
+ fake.rf 1440.00000000 57313.94008798655109871 0.00001 7 
+ fake.rf 1440.00000000 57314.93735757942527442 0.00001 7 
+ fake.rf 1440.00000000 57315.93462676152607571 0.00001 7 
+ fake.rf 1440.00000000 57316.93189628988017859 0.00001 7 
+ fake.rf 1440.00000000 57317.92916608468771500 0.00001 7 
+ fake.rf 1440.00000000 57318.92643563884741909 0.00001 7 
+ fake.rf 1440.00000000 57319.92370500667211886 0.00001 7 
+ fake.rf 1440.00000000 57320.92097463949265190 0.00001 7 
+ fake.rf 1440.00000000 57321.91824443261453936 0.00001 7 
+ fake.rf 1440.00000000 57322.91551412889599604 0.00001 7 
+ fake.rf 1440.00000000 57323.91278367904979874 0.00001 7 
+ fake.rf 1440.00000000 57324.91005316281747284 0.00001 7 
+ fake.rf 1440.00000000 57325.90732257942869055 0.00001 7 
+ fake.rf 1440.00000000 57326.90459220631479909 0.00001 7 
+ fake.rf 1440.00000000 57327.90186149006743932 0.00001 7 
+ fake.rf 1440.00000000 57328.89913154050511324 0.00001 7 
+ fake.rf 1440.00000000 57329.89640102266665522 0.00001 7 
+ fake.rf 1440.00000000 57330.89367033458715639 0.00001 7 
+ fake.rf 1440.00000000 57331.89093986501633182 0.00001 7 
+ fake.rf 1440.00000000 57332.88820984509545298 0.00001 7 
+ fake.rf 1440.00000000 57333.88547920567603811 0.00001 7 
+ fake.rf 1440.00000000 57334.88274882925410125 0.00001 7 
+ fake.rf 1440.00000000 57335.88001817957454165 0.00001 7 
+ fake.rf 1440.00000000 57336.87728763103736185 0.00001 7 
+ fake.rf 1440.00000000 57337.87455732366414551 0.00001 7 
+ fake.rf 1440.00000000 57338.87182704093960695 0.00001 7 
+ fake.rf 1440.00000000 57339.86909641957332440 0.00001 7 
+ fake.rf 1440.00000000 57340.86636640827691735 0.00001 7 
+ fake.rf 1440.00000000 57341.86363555334339992 0.00001 7 
+ fake.rf 1440.00000000 57342.86090517562098157 0.00001 7 
+ fake.rf 1440.00000000 57343.85817495360663187 0.00001 7 
+ fake.rf 1440.00000000 57344.85544421000416193 0.00001 7 
+ fake.rf 1440.00000000 57345.85271420635161732 0.00001 7 
+ fake.rf 1440.00000000 57346.84998362586983944 0.00001 7 
+ fake.rf 1440.00000000 57347.84725328126386401 0.00001 7 
+ fake.rf 1440.00000000 57348.84452279417190823 0.00001 7 
+ fake.rf 1440.00000000 57349.84179218345115103 0.00001 7 
+ fake.rf 1440.00000000 57350.83906177908084700 0.00001 7 
+ fake.rf 1440.00000000 57351.83633123733881476 0.00001 7 
+ fake.rf 1440.00000000 57352.83360121088476191 0.00001 7 
+ fake.rf 1440.00000000 57353.83087036018800475 0.00001 7 
+ fake.rf 1440.00000000 57354.82813996668780732 0.00001 7 
+ fake.rf 1440.00000000 57355.82540954241573061 0.00001 7 
diff --git a/tests/test_pintempo2tcb.py b/tests/test_pintempo2tcb.py
new file mode 100644
index 000000000..882cdcd4d
--- /dev/null
+++ b/tests/test_pintempo2tcb.py
@@ -0,0 +1,42 @@
+#!/usr/bin/env python
+from __future__ import division, print_function
+import sys, os
+try:
+    from StringIO import StringIO
+except ImportError:
+    from io import StringIO
+import unittest
+import numpy as np
+import pint.scripts.pintempo as pintempo
+from pinttestdata import testdir, datadir
+
+parfile = os.path.join(datadir, 'test_TCB.par')
+timfile = os.path.join(datadir, 'test_TCB.simulate')
+
+"""
+Note: test_TCB.simulate has been produced using TEMPO2, with the fake plugin,
+using:
+
+tempo2 -gr fake -start 56990 -end 57355 -f test_TCB.par -ndobs 1 -nobsd 1 -ha 6 -randha n -rms 0.00000001
+"""
+
+class TestPintempo2tcb(unittest.TestCase):
+
+    def test_result(self):
+        saved_stdout, pintempo.sys.stdout = pintempo.sys.stdout, StringIO('_')
+        cmd = '{0} {1}'.format(parfile,timfile)
+        pintempo.main(cmd.split())
+        lines = pintempo.sys.stdout.getvalue()
+        v = 999.0
+        for l in lines.split('\n'):
+            if l.startswith('RMS in time is'):
+                v = float(l.split()[4])
+        # Check that RMS is less than 10 microseconds
+        from astropy import log
+        log.warning('%f' % v)
+        print(v)
+        self.assertTrue(v<10.0)
+        pintempo.sys.stdout = saved_stdout
+
+if __name__ == '__main__':
+    unittest.main()

From 71614a01f80cb341a8b01ac7b91c0942115579ab Mon Sep 17 00:00:00 2001
From: Matthew Pitkin <matthew.pitkin@ligo.org>
Date: Wed, 6 Mar 2019 17:54:40 +0000
Subject: [PATCH 4/4] Some attempts at making topocentric corrections work

---
 pint/models/astrometry.py        |   6 +-
 pint/observatory/observatory.py  |  76 +++-
 pint/toa.py                      |  22 +-
 tests/datafile/test_TCB.par      |  36 +-
 tests/datafile/test_TCB.simulate | 732 +++++++++++++++----------------
 5 files changed, 463 insertions(+), 409 deletions(-)

diff --git a/pint/models/astrometry.py b/pint/models/astrometry.py
index 7490743bc..2c9e8619b 100644
--- a/pint/models/astrometry.py
+++ b/pint/models/astrometry.py
@@ -53,7 +53,7 @@ def ssb_to_psb_xyz_ICRS(self, epoch=None):
     def barycentric_radio_freq(self, toas):
         """Return radio frequencies (MHz) of the toas corrected for Earth motion"""
         tbl = toas.table
-        L_hat = self.ssb_to_psb_xyz_ICRS(epoch=tbl[self.UNITS.value.lower()+'ld'].astype(numpy.float64))
+        L_hat = self.ssb_to_psb_xyz_ICRS(epoch=tbl['tdbld'].astype(numpy.float64))
         v_dot_L_array = numpy.sum(tbl['ssb_obs_vel']*L_hat, axis=1)
         return tbl['freq'] * (1.0 - v_dot_L_array / const.c)
 
@@ -65,7 +65,7 @@ def solar_system_geometric_delay(self, toas, acc_delay=None):
         available as 3-vector toa.xyz, in units of light-seconds.
         """
         tbl = toas.table
-        L_hat = self.ssb_to_psb_xyz_ICRS(epoch=tbl[self.UNITS.value.lower()+'ld'].astype(numpy.float64))
+        L_hat = self.ssb_to_psb_xyz_ICRS(epoch=tbl['tdbld'].astype(numpy.float64))
         re_dot_L = numpy.sum(tbl['ssb_obs_pos']*L_hat, axis=1)
         delay = -re_dot_L.to(ls).value
         if self.PX.value != 0.0 \
@@ -87,7 +87,7 @@ def get_d_delay_quantities(self, toas):
         # TODO: tbl['tdbld'].quantity should have units of u.day
         # NOTE: Do we need to include the delay here?
         tbl = toas.table
-        rd['epoch'] = tbl[self.UNITS.value.lower()+'ld'].quantity * u.day #- delay * u.second
+        rd['epoch'] = tbl['tdbld'].quantity * u.day #- delay * u.second
 
         # Distance from SSB to observatory, and from SSB to psr
         ssb_obs = tbl['ssb_obs_pos'].quantity
diff --git a/pint/observatory/observatory.py b/pint/observatory/observatory.py
index 50122b1f9..ff5e7af93 100644
--- a/pint/observatory/observatory.py
+++ b/pint/observatory/observatory.py
@@ -44,13 +44,47 @@ def __new__(cls, name, *args, **kwargs):
         cls._register(obs, name)
         return obs
 
-    def __init__(self, name, aliases=None, tt2tdb_mode='pint',
-                 tt2tcb_mode='pint'):
+    def __init__(self, name, aliases=None, tt2tdb_mode=None,
+                 tt2tcb_mode=None):
         if aliases is not None:
             Observatory._add_aliases(self,aliases)
         self.tt2tdb_mode = tt2tdb_mode
         self.tt2tcb_mode = tt2tcb_mode
 
+    @property
+    def tt2tdb_mode(self):
+        return self._tt2tdb_mode
+
+    @tt2tdb_mode.setter
+    def tt2tdb_mode(self, val):
+        if val is None:
+            # set default to 'pint'
+            self._tt2tdb_mode = 'pint'
+        elif isinstance(val, str):
+            if val.lower() not in ['pint', 'astropy']:
+                raise ValueError("tt2tdb mode must be 'astropy' or 'pint'")
+            else:
+                self._tt2tdb_mode = val.lower()
+        else:
+            raise TypeError("tt2tdb mode is the wrong type")
+
+    @property
+    def tt2tcb_mode(self):
+        return self._tt2tcb_mode
+
+    @tt2tcb_mode.setter
+    def tt2tcb_mode(self, val):
+        if val is None:
+            # set default to 'pint'
+            self._tt2tcb_mode = 'pint'
+        elif isinstance(val, str):
+            if val.lower() not in ['pint', 'astropy']:
+                raise ValueError("tt2tcb mode must be 'astropy' or 'pint'")
+            else:
+                self._tt2tcb_mode = val.lower()
+        else:
+            raise TypeError("tt2tcb mode is the wrong type")
+
     @classmethod
     def _register(cls,obs,name):
         """Add an observatory to the registry using the specified name
@@ -158,7 +192,7 @@ def clock_corrections(self,t):
         # TOA metadata which may be necessary in some cases.
         raise NotImplementedError
 
-    def get_TDBs(self, t,  method='default', ephem=None, options=None, grp=None):
+    def get_TDBs(self, t,  method='default', tt2tdbmode=None, ephem=None, options=None):
         """This is a high level function for converting TOAs to TDB time scale.
             Different method can be applied to obtain the result. Current supported
             methods are ['astropy', 'ephemeris']
@@ -168,11 +202,14 @@ def get_TDBs(self, t,  method='default', ephem=None, options=None, grp=None):
                 The time need for converting toas
             method: str or callable, optional
                 Method of computing TDB
-
                 - 'default': Astropy time.Time object built-in converter, use FB90.
                     Also uses topocentric correction term if self.tt2tdbmethod is
                     pint.
                 - 'ephemeris': JPL ephemeris included TDB-TT correction.
+            tt2tdbmode: str
+                If set this overrides the default tt2tdb_mode set on
+                initialization of the observatory. This can be 'astropy' or
+                'pint', which 'pint' computes the topocentric correction term.
             ephem: str, optional
                 The ephemeris to get he TDB-TT correction. Required for the
                 'ephemeris' method.
@@ -192,15 +229,19 @@ def get_TDBs(self, t,  method='default', ephem=None, options=None, grp=None):
             options = dict(options)
             return method(t, **options)
         if meth == 'default':
-            if self.tt2tdb_mode.lower().startswith('astropy'):
+            tt2tdb_mode = self.tt2tdb_mode.lower() if tt2tdbmode is None else tt2tdbmode.lower()
+
+            if tt2tdb_mode.startswith('astropy'):
                 log.info('Doing astropy mode TDB conversion')
                 return self._get_TDB_astropy(t)
-            elif self.tt2tdb_mode.lower().startswith('pint'):
+            elif tt2tdb_mode.startswith('pint'):
                 log.info('Doing PINT mode TDB conversion')
                 if ephem is None:
                     raise ValueError("A ephemeris file should be provided to get"
                                         " the TDB-TT corrections, or use tt2tdb_mode=astropy")
-                return self._get_TDB_PINT(t, ephem, grp)
+                return self._get_TDB_PINT(t, ephem)
+            else:
+                raise ValueError("The TDB-TT mode should be 'astropy' or 'pint'")
         elif meth == "ephemeris":
             if ephem is None:
                 raise ValueError("A ephemeris file should be provided to get"
@@ -212,7 +253,7 @@ def get_TDBs(self, t,  method='default', ephem=None, options=None, grp=None):
     def _get_TDB_astropy(self, t):
         return t.tdb
 
-    def _get_TDB_PINT(self, t, ephem, grp=None):
+    def _get_TDB_PINT(self, t, ephem):
         """Uses astropy.Time location to add the topocentric correction term to
             the Time object. The topocentric correction is given as (r/c).(v/c),
             with r equal to the geocentric position of the observer, v being the
@@ -225,7 +266,7 @@ def _get_TDB_PINT(self, t, ephem, grp=None):
 
         #Add in correction term to t.tdb equal to r.v / c^2
         vel = sse.objPosVel_wrt_SSB('earth', t, ephem).vel
-        pos = self.get_gcrs(t, ephem=ephem, grp=grp)
+        pos = self.get_gcrs(t, ephem=ephem)
         dnom = const.c * const.c 
 
         corr = ((pos[0] * vel[0] + pos[1] * vel[1] + pos[2] * vel[2])/dnom).to(u.s)
@@ -239,7 +280,7 @@ def _get_TDB_ephem(self, t, ephem):
         """
         raise NotImplementedError
 
-    def get_TCBs(self, t,  method='default', ephem=None, options=None, grp=None):
+    def get_TCBs(self, t,  method='default', tt2tcbmode=None, ephem=None, options=None, grp=None):
         """This is a high level function for converting TOAs to TCB time scale.
             Different method can be applied to obtain the result. Current supported
             methods are ['astropy', 'ephemeris']
@@ -249,11 +290,14 @@ def get_TCBs(self, t,  method='default', ephem=None, options=None, grp=None):
                 The time need for converting toas
             method: str or callable, optional
                 Method of computing TCB
-
                 - 'default': Astropy time.Time object built-in converter, use FB90.
                     Also uses topocentric correction term if self.tt2tcbmethod is
                     pint.
                 - 'ephemeris': JPL ephemeris included TCB-TT correction.
+            tt2tcbmode: str
+                If set this overrides the default tt2tcb_mode set on
+                initialization of the observatory. This can be 'astropy' or
+                'pint', which 'pint' computes the topocentric correction term.
             ephem: str, optional
                 The ephemeris to get the TCB-TT correction. Required for the
                 'ephemeris' method.
@@ -273,15 +317,19 @@ def get_TCBs(self, t,  method='default', ephem=None, options=None, grp=None):
             options = dict(options)
             return method(t, **options)
         if meth == 'default':
-            if self.tt2tcb_mode.lower().startswith('astropy'):
+            tt2tcb_mode = self.tt2tcb_mode.lower() if tt2tcbmode is None else tt2tcbmode.lower()
+
+            if tt2tcb_mode.startswith('astropy'):
                 log.info('Doing astropy mode TCB conversion')
                 return self._get_TCB_astropy(t)
-            elif self.tt2tcb_mode.lower().startswith('pint'):
+            elif tt2tcb_mode.startswith('pint'):
                 log.info('Doing PINT mode TCB conversion')
                 if ephem is None:
                     raise ValueError("A ephemeris file should be provided to get"
                                      " the TCB-TT corrections, or use tt2tcb_mode=astropy")
                 return self._get_TCB_PINT(t, ephem, grp)
+            else:
+                raise ValueError("The TCB-TT mode should be 'astropy' or 'pint'")
         elif meth == "ephemeris":
             if ephem is None:
                 raise ValueError("A ephemeris file should be provided to get"
@@ -306,7 +354,7 @@ def _get_TCB_PINT(self, t, ephem, grp=None):
 
         #Add in correction term to t.tdb equal to r.v / c^2
         vel = sse.objPosVel_wrt_SSB('earth', t, ephem).vel
-        pos = self.get_gcrs(t, ephem=ephem, grp=grp)
+        pos = self.get_gcrs(t, ephem=ephem)
         dnom = const.c * const.c 
 
         corr = ((pos[0] * vel[0] + pos[1] * vel[1] + pos[2] * vel[2])/dnom).to(u.s)
diff --git a/pint/toa.py b/pint/toa.py
index 4fa21f658..5db6143e6 100644
--- a/pint/toa.py
+++ b/pint/toa.py
@@ -32,7 +32,8 @@
 
 def get_TOAs(timfile, ephem=None, include_bipm=True, bipm_version='BIPM2015',
              include_gps=True, planets=False, usepickle=False,
-             tdb_method="default", tcb_method="default"):
+             tdb_method="default", tcb_method="default", tt2tdb_mode=None,
+             tt2tcb_mode=None):
     """Convenience function to load and prepare TOAs for PINT use.
 
     Loads TOAs from a '.tim' file, applies clock corrections, computes
@@ -58,9 +59,11 @@ def get_TOAs(timfile, ephem=None, include_bipm=True, bipm_version='BIPM2015',
                                   include_bipm=include_bipm,
                                   bipm_version=bipm_version)
     if 'tdb' not in t.table.colnames:
-        t.compute_TDBs(method=tdb_method, ephem=ephem)
+        t.compute_TDBs(method=tdb_method, tt2tdb_mode=tt2tdb_mode,
+                       ephem=ephem)
     if 'tcb' not in t.table.colnames:
-        t.compute_TCBs(method=tcb_method, ephem=ephem)
+        t.compute_TCBs(method=tcb_method, tt2tcb_mode=tt2tcb_mode,
+                       ephem=ephem)
     if 'ssb_obs_pos' not in t.table.colnames:
         t.compute_posvels(ephem, planets)
     # Update pickle if needed:
@@ -103,7 +106,8 @@ def _check_pickle(toafilename, picklefilename=None):
 
 def get_TOAs_list(toa_list,ephem=None, include_bipm=True,
                   bipm_version='BIPM2015', include_gps=True, planets=False,
-                  tdb_method="default", tcb_method="default"):
+                  tdb_method="default", tcb_method="default", tt2tdb_mode=None,
+                  tt2tcb_mode=None):
     """Load TOAs from a list of TOA objects.
 
     Compute the TDB time and observatory positions and velocity
@@ -120,9 +124,9 @@ def get_TOAs_list(toa_list,ephem=None, include_bipm=True,
                                   include_bipm=include_bipm,
                                   bipm_version=bipm_version)
     if 'tdb' not in t.table.colnames:
-        t.compute_TDBs(method=tdb_method, ephem=ephem)
+        t.compute_TDBs(method=tdb_method, ephem=ephem, tt2tdb_mode=tt2tdb_mode)
     if 'tcb' not in t.table.colnames:
-        t.compute_TCBs(method=tcb_method, ephem=ephem)
+        t.compute_TCBs(method=tcb_method, ephem=ephem, tt2tcb_mode=tt2tcb_mode)
     if 'ssb_obs_pos' not in t.table.colnames:
         t.compute_posvels(ephem, planets)
     return t
@@ -810,7 +814,7 @@ def apply_clock_corrections(self, include_bipm=True,
                                      'bipm_version':bipm_version,
                                      'include_gps':include_gps})
 
-    def compute_TDBs(self, method="default", ephem=None):
+    def compute_TDBs(self, method="default", ephem=None, tt2tdb_mode=None):
         """Compute and add TDB and TDB long double columns to the TOA table.
         This routine creates new columns 'tdb' and 'tdbld' in a TOA table
         for TDB times, using the Observatory locations and IERS A Earth
@@ -843,6 +847,7 @@ def compute_TDBs(self, method="default", ephem=None):
             obs = self.table.groups.keys[ii]['obs']
             loind, hiind = self.table.groups.indices[ii:ii+2]
             site = get_observatory(obs)
+            site.tt2tdb_mode = tt2tdb_mode
             if isinstance(site,TopoObs):
                 # For TopoObs, it is safe to assume that all TOAs have same location
                 # I think we should report to astropy that initializing
@@ -876,7 +881,7 @@ def compute_TDBs(self, method="default", ephem=None):
                 data=[utils.time_to_longdouble(t) for t in tdbs])
         self.table.add_columns([col_tdb, col_tdbld])
 
-    def compute_TCBs(self, method="default", ephem=None):
+    def compute_TCBs(self, method="default", ephem=None, tt2tcb_mode=None):
         """Compute and add TCB and TCB long double columns to the TOA table.
         This routine creates new columns 'tcb' and 'tcbld' in a TOA table
         for TCB times, using the Observatory locations and IERS A Earth
@@ -909,6 +914,7 @@ def compute_TCBs(self, method="default", ephem=None):
             obs = self.table.groups.keys[ii]['obs']
             loind, hiind = self.table.groups.indices[ii:ii+2]
             site = get_observatory(obs)
+            site.tt2tcb_mode = tt2tcb_mode
             if isinstance(site, TopoObs):
                 # For TopoObs, it is safe to assume that all TOAs have same location
                 # I think we should report to astropy that initializing
diff --git a/tests/datafile/test_TCB.par b/tests/datafile/test_TCB.par
index 409e33d7d..bd4ac3c5f 100644
--- a/tests/datafile/test_TCB.par
+++ b/tests/datafile/test_TCB.par
@@ -1,26 +1,26 @@
 PSRJ     J1010+2020
 RAJ      10:10:54.21
 DECJ     20:20:01.05
-PMRA     12.3
-PMDEC    -9.8
-POSEPOCH 56789
-DM       101.1
-DMEPOCH  56789
+#PMRA     12.3
+#PMDEC    -9.8
+#POSEPOCH 56789
+#DM       101.1
+#DMEPOCH  56789
 F0       19.67297587421
 F1       -5.48585e-12
 PEPOCH   56789
-BINARY   BT
-ECC      0.0001
-T0       57123
-A1       23.4
-PB       10.0
-OM       98.7
-GLEP_1   57000
-GLPH_1   0
-GLF0_1   8.7e-07
-GLF1_1   -6.6e-15
+#BINARY   BT
+#ECC      0.0001
+#T0       57123
+#A1       23.4
+#PB       10.0
+#OM       98.7
+#GLEP_1   57000
+#GLPH_1   0
+#GLF0_1   8.7e-07
+#GLF1_1   -6.6e-15
 TZRMJD   56990
-TZRFRQ   1414
-TZRSITE  ao
+TZRFRQ   1440
+TZRSITE  pks
 EPHEM    DE405
-UNITS    TCB
+UNITS    TDB
diff --git a/tests/datafile/test_TCB.simulate b/tests/datafile/test_TCB.simulate
index 93f3d7eca..e51c90556 100644
--- a/tests/datafile/test_TCB.simulate
+++ b/tests/datafile/test_TCB.simulate
@@ -1,368 +1,368 @@
 FORMAT 1
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