Implement Gaia-DR3

docs/releases/v0.3.rst

@@ -7,6 +7,8 @@ New Features
 sora.body
 ^^^^^^^^^
 
+- Added `get_position()` in Body as a shortcut to `ephem.get_position()`. [:issue:`76`]
+
 sora.config
 ^^^^^^^^^^^
 
@@ -30,6 +32,8 @@ sora.prediction
 
 - Included the ``VizierCatalogue`` in the prediction function. [:issue:`71`]
 
+- Defined Gaia-DR3 as the default in the `prediction()` function. [:issue:`76`]
+
 sora.star
 ^^^^^^^^^
 
@@ -38,6 +42,10 @@ sora.star
 
 - Included the ``VizierCatalogue`` in the Star class. [:issue:`71`]
 
+- Included the Gaia-DR3 catalogue, released on June 13, 2022, in the catalogue list. [:issue:`76`]
+
+- Defined Gaia-DR3 as the default in the Star class. [:issue:`76`]
+
 API Changes
 -----------
 
@@ -50,6 +58,9 @@ sora.config
 sora.ephem
 ^^^^^^^^^^
 
+- `id_type` for planets and satellites are passed as `None` instead of `major_body`,
+  following changes made in Horizons. [:issue:`76`]
+
 sora.extra
 ^^^^^^^^^^
 

sora/body/core.py

@@ -234,6 +234,26 @@ def __from_local(self, name, spkid):
                               "Tholen": {"value": None, "reference": None, "notes": None}}
         self.discovery = ""
 
+    def get_position(self, time, observer='geocenter'):
+        """Returns the object geocentric position.
+
+        Parameters
+        ----------
+        time : `str`, `astropy.time.Time`
+            Reference time to calculate the object position. It can be a string
+            in the ISO format (yyyy-mm-dd hh:mm:ss.s) or an astropy Time object.
+
+        observer : `str`, `sora.Observer`, `sora.Spacecraft`
+            IAU code of the observer (must be present in given list of kernels),
+            a SORA observer object or a string: ['geocenter', 'barycenter']
+
+        Returns
+        -------
+        coord : `astropy.coordinates.SkyCoord`
+            Astropy SkyCoord object with the object coordinates at the given time.
+        """
+        return self.ephem.get_position(time=time, observer=observer)
+
     def get_pole_position_angle(self, time, observer='geocenter'):
         """Returns the pole position angle and the aperture angle relative to
         the geocenter.

sora/ephem/utils.py

@@ -282,6 +282,7 @@ def ephem_horizons(time, target, observer, id_type='smallbody', output='ephemeri
     if getattr(observer, 'ephem', None) not in ['horizons', None]:
         warnings.warn('Ephemeris using kernel for the observer and Horizons for the target is under construction. '
                       'We will use only Horizons.')
+    id_type = None if id_type == 'majorbody' else id_type
     ob = Horizons(id=target, id_type=id_type, location=location, epochs=time2)
 
     if output == 'ephemeris':

sora/prediction/core.py

@@ -115,7 +115,7 @@ def calc_min(time0, time_interval, delta_t, n_recursions=5, max_tdiff=None):
 
 
 @deprecated_alias(log='verbose')  # remove this line in v1.0
-def prediction(time_beg, time_end, body=None, ephem=None, mag_lim=None, catalogue='gaiaedr3', step=60, divs=1, sigma=1,
+def prediction(time_beg, time_end, body=None, ephem=None, mag_lim=None, catalogue='gaiadr3', step=60, divs=1, sigma=1,
                radius=None, verbose=True, reference_center='geocenter'):
     """Predicts stellar occultations.
 
@@ -141,7 +141,7 @@ def prediction(time_beg, time_end, body=None, ephem=None, mag_lim=None, catalogu
 
     catalogue : `str`, `VizierCatalogue`
         The catalogue to download data. It can be ``'gaiadr2'``, ``'gaiaedr3'``,
-        or a VizierCatalogue object. default='gaiaedr3'
+        ``'gaiadr3'``, or a VizierCatalogue object. default='gaiadr3'
 
     step : `int`, `float`, default=60
         Step, in seconds, of ephem times for search

sora/star/catalog.py

@@ -238,5 +238,11 @@ def __str__(self):
                            pmra='pmRA', pmdec='pmDE', epoch='Epoch', parallax='Plx', rad_vel='RVDR2', band={'G': 'Gmag'},
                            errors=['e_RA_ICRS', 'e_DE_ICRS', 'e_pmRA', 'e_pmDE', 'e_Plx', 'e_RVDR2'])
 
+epoch = Time('J2016.0', scale='tdb')
+gaiadr3 = VizierCatalogue(name='GaiaDR3', cat_path='I/355/gaiadr3', code='Source', ra='RA_ICRS', dec='DE_ICRS',
+                          pmra='pmRA', pmdec='pmDE', epoch=epoch, parallax='Plx', rad_vel='RV', band={'G': 'Gmag'},
+                          errors=['e_RA_ICRS', 'e_DE_ICRS', 'e_pmRA', 'e_pmDE', 'e_Plx', 'e_RV'])
+
 
-allowed_catalogues = SelectDefault(instance=VizierCatalogue, defaults={'gaiadr2': gaiadr2, 'gaiaedr3': gaiaedr3})
+allowed_catalogues = SelectDefault(instance=VizierCatalogue,
+                                   defaults={'gaiadr2': gaiadr2, 'gaiaedr3': gaiaedr3, 'gaiadr3': gaiadr3})

sora/star/core.py

@@ -23,7 +23,7 @@ class Star(MetaStar):
     ----------
     catalogue : `str`, `VizierCatalogue`
         The catalogue to download data. It can be ``'gaiadr2'``, ``'gaiaedr3'``,
-        or a VizierCatalogue object.. default='gaiaedr3'
+        ``'gaiadr3'``, or a VizierCatalogue object.. default='gaiadr3'
 
     code : `str`
         Gaia Source code for searching in VizieR.
@@ -81,7 +81,7 @@ class Star(MetaStar):
     """
 
     @deprecated_alias(log='verbose')  # remove this line in v1.0
-    def __init__(self, catalogue='gaiaedr3', **kwargs):
+    def __init__(self, catalogue='gaiadr3', **kwargs):
 
         self._attributes = {}
         self.mag = {}
@@ -286,7 +286,7 @@ def __searchgaia(self, catalog):
         Parameters
         ----------
         catalog : `VizierCatalogue`
-            The catalogue to download data. It can be ``'gaiadr2'`` or ``'gaiaedr3'``.
+            The catalogue to download data. It can be ``'gaiadr2'``, ``'gaiaedr3'`` or ``'gaiadr3'``.
         """
         if hasattr(self, 'code'):
             catalogue = catalog.search_star(code=self.code)
@@ -307,7 +307,7 @@ def __searchgaia(self, catalog):
         self.code = str(cat_data['code'][0])
         self.epoch = cat_data['epoch'][0]
         self.set_magnitude(**{band: value[0].value for band, value in cat_data['band'].items()})
-        if self.__cgaudin and catalog.name == 'GaiaEDR3':
+        if self.__cgaudin and catalog.name in ['GaiaEDR3', 'GaiaDR3']:
             from sora.star.utils import edr3ToICRF
             self.pmra, self.pmdec = edr3ToICRF(pmra = self.pmra, pmdec = self.pmdec,
                                                ra = self.ra.deg, dec = self.dec.deg, 
@@ -336,7 +336,7 @@ def __searchgaia(self, catalog):
         x = cov[2, 2] * (self.rad_vel.value ** 2 + self.errors['rad_vel'].value ** 2) / (
             A ** 2) + (self.parallax.to(u.rad).value * self.errors['rad_vel'].value / A) ** 2
         cov[5, 5] = x
-        if catalog.name in ['GaiaDR2', 'GaiaEDR3']:
+        if catalog.name in ['GaiaDR2', 'GaiaEDR3', 'GaiaDR3']:
             a = ['RA', 'DE', 'Plx', 'pmRA', 'pmDE']
             for i in np.arange(5):
                 v1 = 'e_' + a[i]
@@ -541,7 +541,7 @@ def __str__(self):
             out += 'User coordinates\n'
         text_cgaudin = ''
         if self.__cgaudin:
-            text_cgaudin = 'Gaia-EDR3 Proper motion corrected as suggested by Cantat-Gaudin & Brandt (2021) \n'
+            text_cgaudin = f'{self._catalogue} Proper motion corrected as suggested by Cantat-Gaudin & Brandt (2021) \n'
         out += ('ICRS star coordinate at J{}:\n'
                 'RA={} +/- {:.4f}, DEC={} +/- {:.4f}\n'
                 'pmRA={:.3f} +/- {:.3f} mas/yr, pmDEC={:.3f} +/- {:.3f} mas/yr\n{}'

sora/star/meta.py

@@ -185,7 +185,7 @@ def bjones(self, value):
     @property
     def diameter_gaia(self):
         try:
-            rad = self.meta_gaia.get('Rad')
+            rad = self.meta_catalogue.get('Rad')
             if rad is not None and not np.ma.core.is_masked(rad):
                 return 2*np.arctan((rad*u.solRad)/self.distance).to(u.mas)
         except: