Selections from Gaia Data Release 3 (DR3) This schema contains data re-published from the official Gaia mirrors (such as ivo://uni-heidelberg.de/gaia/tap) either to support combining its data with local tables (the various Xlite tables) or to make the data more accessible to VO clients (e.g., epoch fluxes). Other Gaia-related data is found in, among others, the gdr3mock, gdr3spec, gedr3auto, gedr3dist, gedr3mock, and gedr3spur schemas. GAIA Collaboration Catalog Optical 2020-11-17T11:00:00Z 20 stars surveys astrometry proper-motions Gaia Updated from eDR3 to DR3. We keep the previous edr3lite table since it has been in use by third parties, but it is now just an alias for dr3lite. This means that the (dr2) radial velocities in previous edr3lite in effect have changed (the columns are now simply gone). If you use public Gaia DR3 data in a paper, please take note of `ESAC's guide`_ on how to acknowledge and cite it. .. _ESAC's guide: https://gea.esac.esa.int/archive/documentation/GDR3/Miscellaneous/sec_credit_and_citation_instructions/ 2015-06-01 2015-06-01 0/0-11 1.986e-19 4.966e-19 Position ICRS BARYCENTER SPHER3 Epoch J2016.0 "ra" "dec" "parallax" Error "ra_error" "dec_error" "parallax_error" Velocity "pmra" "pmdec" "radial_velocity" Error "pmra_error" "pmdec_error" "radial_velocity_error" 10000 10000 10000 10000 5000 band, ucd rp, R bp, B 5000 For the contents of Gaia DR3, the source ID consists of a 64-bit integer, least significant bit = 1 and most significant bit = 64, comprising: * a HEALPix index number (sky pixel) in bits 36 - 63; by definition the smallest HEALPix index number is zero. * a 3-bit Data Processing Centre code in bits 33 - 35; for example MOD(source_id / 4294967296, 8) can be used to distinguish between sources initialised via the Initial Gaia Source List by the Torino DPC (code = 0) and sources otherwise detected and assigned by Gaia observations (code > 0) * a 25-bit plus 7 bit sequence number within the HEALPix pixel in bits 1 to 32 split into: * a 25 bit running number in bits 8 - 32; the running numbers are defined to be positive, i.e. never zero (except in the case of forced empty windows) * a 7-bit component number in bits 1 - 7 This means that the HEALpix index level 12 of a given source is contained in the most significant bits. HEALpix index of 12 and lower levels can thus be retrieved as follows: * HEALpix level 12 = source_id / 34359738368 * HEALpix level 11 = source_id / 137438953472 * HEALpix level 10 = source_id / 549755813888 * HEALpix level n = source_id / 2^35 * 4^(12 - level). `_). This is essentially the astrometric_chi2 from the DR2 release, but corrected for its strong dependency on magnitude and colour. For quality cuts, this is the recommended quantity to use. Lindegren suggests using RUWE<1.4 as a quality cut for “good” solutions based on the shape of the distribution. The values given here were calculated independently of DPAC and do not use interpolation on the grids provided by Lindegren et al. Thus, minor differences from the “official” RUWE values are expected. As Lindegren et al point out, such differences should not matter in science applications, though. ]]> As long as the SNR is larger than 10 or so, 1.09*mag/snr is a reasonable approximation for an roughly symmetric magnitude error. For smaller SNR, the error distribution of the magnitude becomes very asymmetric and highly non-Gaussian. Gaia DR3 source catalogue "light" This is gaia_source from the Gaia Data Release 3, stripped to just enough columns to enable basic science (but therefore a bit faster and simpler to deal with than the full gaia_source table). Note that on this server, there is also The gedr3dist.main, which gives distances computed by Bailer-Jones et al. Use these in preference to working with the raw parallaxes. This server also carries the gedr3mock schema containing a simulation of gaia_source based on a state-of-the-art galaxy model, computed by Rybizki et al. The full DR3 is available from numerous places in the VO (in particular from the TAP services ivo://uni-heidelberg.de/gaia/tap and ivo://esavo/gaia/tap). //scs#pgs-pos-index Gaia eDR3 source catalogue "light" This is a “light” version of the full Gaia DR3 gaia_source table. It is just a view copying gaia.dr3lite, which should preferentially be used in new queries. This table is being kept around in order to keep legacy queries from breaking unnecessarily. However, it is actually DR3 data rather than eDR3. The minute differences did not seem to warrant keeping two copies of the relatively massive data around. CREATE VIEW \qName AS (SELECT \colNames FROM gaia.dr3lite) make-view Gaia DR3 Lite Cone Search DR3 lite Cone 303.29074137 40.9302920611415004 0.001 /tap/sync row = self.getFirstVOTableRow() self.assertEqual(len(row), 27) self.assertEqual(row["radial_velocity"], None) self.assertAlmostEqual(row["ra"], 303.285115764069) self.assertAlmostEqual(row["ruwe"], 1.05832231) cone/scs.xml row = self.getFirstVOTableRow(rejectExtras=False) self.assertEqual(row['source_id'], '2062596647361324032') self.assertEqual(row["parallax"], None) self.assertEqual(row["astrometric_params_solved"], 3)