I/359 Gaia DR3 Part 5. Solar System (Gaia Collaboration, 2022)
Gaia Data Release 3 (Gaia DR3) Part 5: Solar System.
Gaia collaboration
<Astron. Astrophys., in prep. (2022)>
=2023A&A...674A...1G 2023A&A...674A...1G
=2022yCat.1359....0G 2022yCat.1359....0G
ADC_Keywords: Surveys ; Solar system ; Minor planets ; Optical
Mission_Name: Gaia
Keywords: catalogs - astrometry - parallaxes - proper motions -
techniques: photometric - techniques: radial velocities
Abstract:
Gaia Data Release 3 (Gaia DR3) will be released on 13 June 2022.
The Gaia DR3 catalogue builds upon the Early Data Release 3 (released
on 3 December 2020) and combines, for the same stretch of time and the
same set of observations, these already-published data products with
numerous new data products such as extended objects and non-single
stars.
Description:
The set of data released as Gaia Early Data Release 3 (Gaia EDR3) on 3
December 2020 comprises:
The full astrometric solution --- positions on the sky (α,
δ), parallaxes, and proper motions --- for around 1.46 billion
(1.46*109) sources, with a limiting magnitude of about G≃21 and a
bright limit of about G≃3. The astrometric solution is accompanied
with some new quality indicators, like RUWE, and source image
descriptors. The full astrometric solution has been done as
5-parameter solution for 585 million sources and as 6-parameter
solution for 882 million sources. In the 6-parameter solution, the
additional fitted quantity is the so-called pseudo-colour that had to
be included for sources without high-quality colour information. In
addition, two-parameters solutions --- positions on the sky (α,
δ) --- for around 344 million additional sources. G magnitudes
for around 1.806 billion sources (with the known issue present in EDR3
corrected in Gaia DR3). GBP and GRP magnitudes for around 1.54 billion
and 1.55 billion sources, respectively.
In Gaia Data Release 3 (Gaia DR3), the above set of data is
complemented with new products released on 13 June 2022 (EAS
presentation A. Vallenari):
Object classifications for 1.59 billion sources and astrophysical
parameters (Teff, logg, [M/H], AG, distance, etc.) from BP/RP spectra
for 470 million objects, including MCMC samples for most sources with
astrophysical parameters (EAS presentation O.Creevey). Other
astrophysical parameters from the BP/RP spectra include:
Spectral types (217 million stars) and emission-line star
classifications (57,000 stars);
Spectroscopic parameters for 2.3 million hot stars, 94,000 ultra-cool
stars, activity index for 1.3 million cool stars, and H-alpha emission
for 235 million stars;
Evolutionary parameters (mass and age) for 128 million stars;
Astrophysical parameters for 348 million objects based on the
assumption of an unresolved binary in the BP/RP spectra;
Self-organised map (outlier) analysis based on 56 million sources with
the weakest object classifications. Astrophysical parameters (Teff,
logg, [M/H], [X/M] for 12 elements, etc.) from RVS spectra for 5.5
million objects, including diffuse interstellar bands for 472,000
objects.
All-sky total galactic extinction maps at 4 different spatial
resolutions (HEALPix levels 6, 7, 8, and 9).
Mean BP/RP spectra for 219 million sources, most of them with G < 17.6
mag (EAS Presentation F. De Angeli).
Mean RVS spectra for 1 million well-behaved objects (EAS presentation
P. Sartoretti).
Mean radial velocities for 33 million stars and mean GRVS magnitudes
for 32 million objects with GRVS≲14mag with effective temperatures
(Teff) in the range of ∼3100 to 14500K (EAS presentation P.
Sartoretti).
Rotational velocities for 3.5 million sources with GRVS≲12mag.
Variability analysis, together with the underlying epoch photometry,
for 10.5 million sources. Apart from classification into 24
variability classes, detailed variability results are provided in
separate tables for the following candidates (EAS presentation L.
Eyer):
Cepheids (15,021 objects);
Compact companions (6306 objects);
Eclipsing binaries (2,184,477 objects);
Long-period variables (1,720,588 objects);
Microlensing events (363 objects);
Planetary transits (214 objects);
RR Lyrae stars (271,779 objects);
Short-timescale variables (471,679 objects);
Solar-like rotational modulation variables (474,026 objects);
Upper-main-sequence oscillators (54,476 objects);
Active galactic nuclei (872,228 objects).
Solar-system results for 158,000 sources (including 31 planetary
satellites), with orbital solutions and individual epoch observations
for 154,000 objects and with mean BP/RP reflectance spectra for more
than 60,000 objects (EAS presentation P. Tanga). Some 813,000
non-single stars, including amongst others non-single-star models for
sources compatible with an astrometric acceleration solution,
non-single-star orbital models for spectroscopic binaries compatible
with a trend, and non-single-star orbital models for sources
compatible with a two-body solution (EAS presentation F. Arenou).
Some 6.6 million quasar candidates with redshift estimates for most of
them (EAS presentation L. Galluccio).
Some 1.1 million quasars analysed with 60,000 host galaxies detected
and 15,000 surface brightness profiles of the host galaxy.
Some 4.8 million galaxy candidates with redshift estimates for more
than 1 million objects (EAS presentation L. Galluccio).
Some 900,000 galaxies analysed with two surface brightness profiles.
The Gaia Andromeda Photometric Survey (GAPS), consisting of the
photometric time series for all 1.2 million sources located in a
5.5-degree radius field centred on the Andromeda galaxy.
Selected tables from Gaia Collaboration performance verification
papers published with Gaia DR3.
All 2612 science alerts triggered in the period underlying Gaia DR3.
The new data set neither contains new astrometry nor new photometric
calibrations such that the following elements are in common for and
apply to both Gaia EDR3 and Gaia DR3:
About 1.61 million celestial reference frame (Gaia-CRF3) sources.
Cross-matches between Gaia (E)DR3 sources on the one hand and
Hipparcos-2, Tycho-2 + TDSC merged, 2MASS PSC (merged with 2MASS XSC),
SDSS DR13, Pan-STARRS1 DR1, SkyMapper DR2, GSC 2.3, APASS DR9, RAVE
DR5, allWISE, URAT-1, and RAVE DR6 data on the other hand.
Additionally, a Gaia DR2 to Gaia (E)DR3 match table.
Full photometric passband definitions for G, GBP, GRP, and GRVS. More
information is available here. Please be aware that the photometric
system for the G, GBP, and GRP bands in Gaia (E)DR3 is different from
the photometric systems as used in Gaia DR2 and in Gaia DR1.
Simulated data from the Gaia Object Generator (GOG) and the Gaia
Universe Model Snapshot (GUMS).
The commanded scan law covering the Gaia (E)DR3 data collection
period. Also the major periods where data was not sent to the ground
or could not be processed are identified.
All of the above combined makes up the full Gaia Data Release 3.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
ssos.dat 66 158152 Data related to Solar System objects observed
by Gaia (sso_source)
ssoobs.sam 455 1000 Solar System object observations
(23336467 lines) (sso_observation)
ssor.dat 97 968288 Mean BP/RP reflectance spectra of asteroids
computed as the ratio between the asteroid flux
and an averaged solar analogue flux for 60518
objects (ssoreflectancespectrum)
ssoorb.dat 1552 154741 Orbital parameters and uncertainties computed
from the sso_observation astrometric data
(sso_orbits)
--------------------------------------------------------------------------------
See also:
I/355 : Gaia DR3 Part 1: Main sources
I/356 : Gaia DR3 Part 2: Extra-galactic
I/357 : Gaia DR3 Part 3: Non-single stars
I/358 : Gaia DR3 Part 4: Variability
I/359 : Gaia DR3 Part 5: Solar System
I/360 : Gaia DR3 Part 6: Performance verification
Byte-by-byte Description of file: ssos.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- SolID Solution Identifier (solution_id)
21- 31 I11 --- Source Source identifier (source_id)
33- 35 I3 --- Nobs Number of observations (numofobs)
37- 42 I6 --- MPC Minor Planet number (number_mp)
44- 63 A20 --- Name Standard MPC denomination of the asteroid
(denomination)
65- 66 I2 --- Nsp Number of epoch spectra used to compute the
average (numofspectra)
68 A1 --- Sat [+] + for satellites of solar system planets (1)
--------------------------------------------------------------------------------
Note (1): List of satellites of solar system planets:
-------------------------------------------------------------------
SolID Source Nobs MPC Name Nsp
-------------------------------------------------------------------
4167557769573408785 -4293961195 195 0 Ariel (UI) 0
4167557769573408785 -4293963294 7 0 Deimos (MII) 0
4167557769573408785 -4293962295 68 0 Io (JI) 0
4167557769573408785 -4293962294 111 0 Europa (JII) 0
4167557769573408785 -4293962292 30 0 Callisto (JIV) 0
4167557769573408785 -4293962290 195 0 Himalia (JVI) 0
4167557769573408785 -4293961294 23 0 Enceladus (SII) 0
4167557769573408785 -4293961293 255 0 Tethys (SIII) 0
4167557769573408785 -4293961292 401 0 Dione (SIV) 0
4167557769573408785 -4293961291 325 0 Rhea (SV) 0
4167557769573408785 -4293961290 19 0 Titan (SVI) 0
4167557769573408785 -4293960294 193 0 Umbriel (UII) 0
4167557769573408785 -4293960293 180 0 Titania (UIII) 0
4167557769573408785 -4293960292 189 0 Oberon (UIV) 0
4167557769573408785 -4293959295 153 0 Triton (NI) 0
4167557769573408785 -4293959294 193 0 Nereid (NII) 0
4167557769573408785 -4293962289 243 0 Elara (JVII) 0
4167557769573408785 -4293962288 363 0 Pasiphae (JVIII) 0
4167557769573408785 -4293962287 169 0 Sinope (JIX) 0
4167557769573408785 -4293962286 136 0 Lysithea (JX) 0
4167557769573408785 -4293962285 255 0 Carme (JXI) 0
4167557769573408785 -4293962284 178 0 Ananke (JXII) 0
4167557769573408785 -4293962283 173 0 Leda (JXIII) 0
4167557769573408785 -4293961289 497 0 Hyperion (SVII) 0
4167557769573408785 -4293961288 345 0 Iapetus (SVIII) 0
4167557769573408785 -4293961287 514 0 Phoebe (SIX) 0
4167557769573408785 -4293961284 5 0 Helene (SXII) 0
4167557769573408785 -4293962279 8 0 Callirrhoe (JXVII) 0
4167557769573408785 -4293962278 84 0 Themisto (JXVIII) 0
4167557769573408785 -4293960279 123 0 Sycorax (UXVII) 0
4167557769573408785 -4293961267 124 0 Siarnaq (SXXIX) 0
-------------------------------------------------------------------
--------------------------------------------------------------------------------
Byte-by-byte Description of file: ssoobs.sam
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 I11 --- Source Source identifier (source_id)
13- 27 F15.11 deg RAdeg Right ascension of the source (ICRS)
at Ep=Epoch (ra)
29- 43 F15.11 deg DEdeg Declination of the source (ICRS)
at Ep=Epoch (dec)
45- 63 I19 --- SolID Solution Identifier (solution_id)
65- 84 A20 --- Name Standard MPC denomination of the asteroid
(denomination)
86-102 I17 --- TransitID Transit Identifier (transit_id)
104-121 I18 --- ObsID Observation Identifier (observation_id)
123-128 I6 --- MPC Minor Planet number (number_mp)
130-140 F11.6 d Epoch Gaia-centric epoch TCB (Gaia) (JD-2455197.5)
(epoch)
142-152 F11.6 d EpochUTC Gaia-centric TCB epoch converted to UTC
(JD-2455197.5) (epoch_utc)
154-159 F6.4 mas e_RAdeg Standard error of right ascension - systematic
(raerrorsystematic)
161-166 F6.4 mas e_DEdeg Standard error of declination - systematic
(decerrorsystematic)
168-174 F7.4 --- RADEcors Correlation of ra and dec errors - systematic
(radeccorrelation_systematic)
176-183 F8.4 mas eRAdeg Standard error of right ascension - random
(raerrorrandom)
185-192 F8.4 mas eDEdeg Standard error of declination - random
(decerrorrandom)
194-200 F7.4 --- RADEcorr Correlation of ra and dec errors - random
(radeccorrelation_random)
202-210 F9.6 mag Gmag ? Calibrated G mag (g_mag)
212-222 E11.5 e-/s FG ? Average calibrated G flux for the transit
(g_flux)
224-234 E11.5 e-/s e_FG ? Error on the G flux (gfluxerror)
236-249 F14.11 AU Xpos Barycentric x position of Gaia (x_gaia)
251-264 F14.11 AU Ypos Barycentric y position of Gaia (y_gaia)
266-279 F14.11 AU Zpos Barycentric z position of Gaia (z_gaia)
281-294 F14.11 AU/d VX Barycentric x velocity of Gaia (vx_gaia)
296-309 F14.11 AU/d VY Barycentric y velocity of Gaia (vy_gaia)
311-324 F14.11 AU/d VZ Barycentric z velocity of Gaia (vz_gaia)
326-339 F14.11 AU Xposgeo Geocentric x position of Gaia
(xgaiageocentric)
341-354 F14.11 AU Yposgeo Geocentric y position of Gaia
(ygaiageocentric)
356-369 F14.11 AU Zposgeo Geocentric z position of Gaia
(zgaiageocentric)
371-384 F14.11 AU/d VXgeo Geocentric x velocity of Gaia
(vxgaiageocentric)
386-399 F14.11 AU/d VYgeo Geocentric y velocity of Gaia
(vygaiageocentric)
401-414 F14.11 AU/d VZgeo Geocentric z velocity of Gaia
(vzgaiageocentric)
416-423 F8.4 deg PA Position angle of the scanning direction
(positionanglescan)
425-426 I2 --- ccd0 [11/12] Parameter 0 of the result of
processing the CCDs vector
(astrometricoutcomeccd[0])
428-429 I2 --- ccd1 [1/41] Parameter 1 of the result of
processing the CCDs vector
(astrometricoutcomeccd[1])
431-432 I2 --- ccd2 [1/41] Parameter 2 of the result of
processing the CCDs vector
(astrometricoutcomeccd[2])
434-435 I2 --- ccd3 [1/41] Parameter 3 of the result of
processing the CCDs vector
(astrometricoutcomeccd[3])
437-438 I2 --- ccd4 [1/41] Parameter 4 of the result of
processing the CCDs vector
(astrometricoutcomeccd[4])
440-441 I2 --- ccd5 [1/41] Parameter 5 of the result of
processing the CCDs vector
(astrometricoutcomeccd[5])
443-444 I2 --- ccd6 [1/41] Parameter 6 of the result of
processing the CCDs vector
(astrometricoutcomeccd[6])
446-447 I2 --- ccd7 [1/41] Parameter 7 of the result of
processing the CCDs vector
(astrometricoutcomeccd[7])
449-450 I2 --- ccd8 [1/41] Parameter 8 of the result of
processing the CCDs vector
(astrometricoutcomeccd[8])
452-453 I2 --- ccd9 [1/41] Parameter 9 of the result of
processing the CCDs vector
(astrometricoutcomeccd[9])
455 I1 --- Flagccd [1/2] Result of processing the transit
(astrometricoutcometransit) (1)
--------------------------------------------------------------------------------
Note (1): Flag as follows:
1 = The transit contains at least one good position.
2 = Positions derived, but less consistent than expected. This means that the
criterion to reject outliers had to be relaxed to find an unambiguous
set of consistent positions
--------------------------------------------------------------------------------
Byte-by-byte Description of file: ssor.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 I11 --- Source Source identifier (source_id)
13- 31 I19 --- SolID Solution Identifier (solution_id)
33- 38 I6 --- MPC Minor Planet number (number_mp)
40- 55 A16 --- Name Standard MPC denomination of the asteroid
(denomination)
57- 58 I2 --- Nsamples [16] Nb samples in spectrum (nb_samples)
60- 61 I2 --- Nsp Number of epoch spectra used to compute the
average (numofspectra)
63- 75 E13.7 --- ReflSp ? Reflectance spectrum
(reflectance_spectrum)
77- 88 E12.7 --- e_ReflSp ? Error in reflectance spectrum
(reflectancespectrumerr)
90- 95 F6.1 nm lambda Internally-calibrated wavelength of
reflectance spectrum (wavelength)
97 I1 --- f_ReflSp [0/2] Reflectance spectrum value flag
(reflectancespectrumflag) (1)
--------------------------------------------------------------------------------
Note (1): Reflectance spectrum flag as follows:
0 = Good quality
1 = Potential poor quality
2 = The quality appears compromised.
The use of this reflectance value is not recommended
--------------------------------------------------------------------------------
Byte-by-byte Description of file: ssoorb.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- MPC SSO Number (number_mp)
8- 23 A16 --- Name Solar system object name (denomination)
25- 30 F6.1 d Obs.epoch Reference epoch for osculating orbit
(osc_epoch)
32- 53 E22.16 rad Orb.m Mean anomaly (mean_anomaly)
55- 76 E22.16 rad Omega Argument of perihelion (arg_perihelion)
78- 98 E21.16 rad Node Longitude of ascending node
(longascnode)
100- 120 E21.16 rad inc Inclination (inclination)
122- 142 E21.16 --- ecc Eccentricity (eccentricity)
144- 162 F19.16 AU a Semimajor axis (semimajoraxis)
164- 667 21E24.16 --- orb-covar 21 parameters of var-covar matrix on
elliptical elements at reference Epoch
Obs.epoch
(orbitalelementsvarcovarmatrix)(1)
668- 690 E23.16 AU e_a Standard deviation on Semimajor axis
(stddevsemimajoraxis_
692- 835 6E24.16 --- hstvec 6 parameters of heliocentric State
Vector at reference Epoch Obs.epoch
(hstatevector) (2)
836-1528 21E33.16 --- hstvec-covar 21 parameters of covariance matrix of
the State Vector
(hstatevectorvarcovar_matrix) (3)
1529-1548 F20.15 d ArcLength Orbital arc length spanned by the
observations (arc_length)
1550-1552 I3 --- Nobs Number of observations
(num_observations)
--------------------------------------------------------------------------------
Note (1): covariance uncertainty matrix of the osculating orbit at reference
epoch Obs.epoch (heliocentric), diagonal and triangular components .
Note (2): Initial conditions position and velocity (state vector) in cartesian
coordinates of the osculating orbit at reference epoch Obs.epoch (heliocentric,
in the ICRF). Units are au for positions, and au/d for velocities.
Note (3): Covariance uncertainty matrix of the state vector (hstvec) at
reference epoch Obs.epoch (heliocentric, in the ICRF).
--------------------------------------------------------------------------------
History:
From Gaia team
Acknowledging Gaia/esa :
Acknowledge and cite Gaia DR3:
https://www.cosmos.esa.int/web/gaia-users/credits
Acknowledgements:
Gaia team
(End) Arnaud Siebert, Francois-Xavier Pineau, Patricia Vannier [CDS] 11-May-2022