{ "id": "I/350", "title_cds": "Gaia EDR3", "title_create": "Gaia Collaboration, 2020", "year": "2020", "author": "Gaia collaboration", "title_pub": " Gaia Early Data Release 3 (Gaia EDR3).", "first_author": "Gaia collaboration", "bibcode": [ "2020yCat.1350....0G", "2021A&A...649A...1G" ], "ref_biblio": [ "" ], "keyword_cds": [ "Surveys", "Stars, standard", "Positional data", "Proper motions", "Photometry, photographic", "Cross identifications", "Radial velocities", "Stars, variable", "Minor planets", "Parallaxes, trigonometric" ], "keyword_pub": "catalogs - astrometry - parallaxes - proper motions - techniques: photometric - techniques: radial velocities", "mission": "Gaia", "abstract": [ "Gaia DR3 data (both Gaia EDR3 and the full Gaia DR3) are based on data", "collected between 25 July 2014 (10:30 UTC) and 28 May 2017 (08:44", "UTC), spanning a period of 34 months. As a comparison, Gaia DR2 was", "based on 22 months of data and Gaia DR1 was based on observations", "collected during the first 14 months of Gaia's routine operational", "phase.", "", "Survey completeness:", "", "The Gaia EDR3 catalogue is essentially complete between G=12 and G=17.", "The source list for the release is incomplete at the bright end and", "has an ill-defined faint magnitude limit, which depends on celestial", "position.", "", "The combination of the Gaia scan law coverage and the filtering on", "data quality which will be done prior to the publication of Gaia EDR3,", "does lead to some regions of the sky displaying source density", "fluctuations that reflect the scan law pattern. In addition, small", "gaps exist in the source distribution, for instance close to bright", "stars.", "", "Astrometry:", "", "The parallax improvement is typically 20% with respect to Gaia DR2.", "The proper motions are typically a factor two better than in Gaia DR2.", "An overall reduction of systematics has been achieved. E.g., the", "parallax zero point deduced from the extragalactic sources is about", "-20{mu}as. A tentative correction formula for the parallax zero point", "will be provided.", "Closer to the release date of Gaia Early Data Release 3, an update", "will be given on the astrometry.", "", "Photometry:", "", "The G-band photometric uncertainties are ~0.25mmag for G<13, 1mmag", "at G=17, and 5mmag at G=20mag.", "The GBP-band photometric uncertainties are ~1mmag for G<13, 10mmag", "at G=17, and 100mmag at G=20mag.", "The GRP-band photometric uncertainties are ~1mmag for G<13, 5mmag at", "G=17, and 50mmag at G=20mag.", "Closer to the release date of Gaia Early Data Release 3, an update", "will be given on the photometry.", "", "Gaia EDR3 does not contain new radial velocities. The radial", "velocities of Gaia Data Release 2 have been added to Gaia EDR3 in", "order to ease the combination of spectrosopic and astrometric data.", "", "Radial velocities:", "", "Gaia EDR3 hence contains Gaia DR2 median radial velocities for about", "7.21 million stars with a mean G magnitude between ~4 and ~13 and an", "effective temperature (Teff) in the range ~3550 to 6900K. The overall", "precision of the radial velocities at the bright end is of the order", "of ~200-300m/s while at the faint end, the overall precision is", "~1.2km/s for a Teff of 4750K and ~3.5km/s for a Teff of 6500K.", "", "Before publication in Gaia EDR3, an additional filtering has been", "performed onto the Gaia DR2 radial velocities to remove some 4000", "sources that had wrong radial velocities.", "", "Please be aware that the Gaia DR2 values are assigned to the Gaia EDR3", "sources through an internal cross-match operation. In total, ~10000", "Gaia DR2 radial velocities could not be associated to a Gaia EDR3", "source.", "", "Astrophysical parameters:", "", "Gaia EDR3 does not contain new astrophysical parameters. Astrophysical", "parameters have been published in Gaia DR2 and a new set is expected", "to be released with the full Gaia DR3 release.", "", "Variable stars:", "", "Gaia EDR3 does not contain newly classified variable stars. For the", "overview of the currently available variable stars from Gaia DR2, have", "a look here. Classifications for a larger set of variable stars are", "expected with the full Gaia DR3 release.", "", "Solar system objects:", "", "A large set of solar system objects with orbits will become available", "with the full Gaia DR3 release. Information on the currently available", "asteroids in Gaia DR2 can be found here.", "", "Documentation:", "", "Data release documentation is provided along with each data release in", "the form of a downloadable PDF and a webpage. The various chapters of", "the documentation have been indexed at ADS allowing them to be cited.", "Please visit the Gaia Archive (https://gea.esac.esa.int/archive) to", "access this documentation, and make sure to check out all relevant", "information given through the documentation overview page", "(https://www.cosmos.esa.int/web/gaia-users/archive)." ], "description": [ "Contents of Gaia EDR3:", "", "The five-parameter astrometric solution - positions on the sky", "(alpha,delta), parallaxes, and proper motions - for around 1.5 billion", "(1.5x10^9^) sources, with a limiting magnitude of about G~=21 and a", "bright limit of about G~=3. The astrometric solution will be", "accompanied with some new quality indicators, like RUWE, and source", "image descriptors.", "", "In addition, two-parameters solutions - positions on the sky", "(alpha,delta) - for around 300 million additional sources.", "", "G magnitudes for around 1.8 billion sources.", "", "GBP and GRP magnitudes for around 1.5 billion sources.", "", "Please be aware that the photometric system for the G, GBP, and GRP", "bands in Gaia EDR3 is different from the photometric system as used in", "Gaia DR2 and Gaia DR1.", "", "Full passband definitions for G, GBP, and GRP. More information will", "become available here.", "", "About 1.5 million celestial reference frame (Gaia-CRF) sources.", "", "Cross-matches between Gaia EDR3 sources on the one hand and", "Hipparcos-2, Tycho-2 + TDSC merged, 2MASS PSC (merged with 2MASX),", "SDSS DR13, Pan-STARRS1 DR1, SkyMapper DR1, GSC 2.3, APASS DR9, RAVE", "DR5, allWISE, and URAT-1 data on the other hand.", "", "Additionally, a Gaia EDR3 to Gaia DR2 match will be provided.", "", "Simulated data from Gaia Object Generator (GOG) and Gaia Universe", "Model Snapshot (GUMS) will be provided.", "", "The commanded scan law covering the Gaia EDR3 data collection period", "will be provided. Also the major periods where data was not sent to", "the ground or could not be processed are identified.", "", "Gaia DR3 data (both Gaia EDR3 and the full Gaia DR3) are based on data", "collected between 25 July 2014 (10:30 UTC) and 28 May 2017 (08:44", "UTC), spanning a period of 34 months. As a comparison, Gaia DR2 was", "based on 22 months of data and Gaia DR1 was based on observations", "collected during the first 14 months of Gaia's routine operational", "phase.", "", "The reference epoch for Gaia DR3 (both Gaia EDR3 and the full Gaia", "DR3) is 2016.0. Remember that the reference epoch is different for", "each Gaia data release (it was was J2015.5 for Gaia DR2 and J2015.0", "for Gaia DR1).", "", "Positions and proper motions are referred to the ICRS, to which the", "optical reference frame defined by Gaia EDR3 is aligned. The time", "coordinate for Gaia EDR3 is the barycentric coordinate time (TCB)." ], "curator": "Giacomo Monari, Thomas Boch, Patricia Vannier [CDS]", "history": [ "From Gaia team" ], "see_also": [ "II/328 : AllWISE Data Release (Cutri+ 2013)", "II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016)", "II/358 : SkyMapper Southern Sky Survey. DR1.1 (Wolf+, 2018)", "I/329 : URAT1 Catalog (Zacharias+ 2015)", "https://www.cosmos.esa.int/web/gaia/earlydr3 : Gaia EDR3 Home Page" ], "ack": "Gaia team", "tables": [ { "name": "gaiaedr3.sam", "desc": "GaiaSource EDR3 data" }, { "name": "agncrid.dat", "desc": "AGN cross-identifications (AgnCrossId.csv)" }, { "name": "tyc2tdsc.dat", "desc": "Tycho-2 merged with the TDSC catalog and TDSC supplement" }, { "name": "comscanl.dat", "desc": "*Representation of the Gaia scanning law over the 34 month time period covered by the Gaia Data Release 3" }, { "name": "framers.dat", "desc": "Sources used to compute the Gaia reference frame (FrameRotatorSource.csv)" } ], "archive_date_creation": "24-Nov-2020", "catid": 1350, "vizier_date_update": "23-Feb-2024", "xmatch": "I/350/gaiaedr3", "doi_pub": [ "10.1051/0004-6361/202039657" ], "doi_cds": "10.26093/cds/vizier.1350", "doi_ori": [ { "relation_type": "Cites", "description": "Gaia eDR3 at ESA", "doi": "10.5270/esa-1ugzkg7" }, { "relation_type": "IsVariantFormOf", "description": "Gaia eDR3 at ESA", "doi": "10.5270/esa-1ugzkg7" } ], "alias": "EDR3", "type": [ "OC" ], "records": "1811709771 sources", "has_large_table": true, "hats": [ "https://vizcat.cds.unistra.fr/hats/gaia_edr3/" ], "archive_date_update": "09-Jan-2025", "uat": [ "Surveys", "Standard stars", "Astrometry", "Proper motions", "Optical astronomy", "Photographic photometry", "Astronomical object identification", "Radial velocity", "Variable stars", "Asteroids", "Optical astronomy", "Trigonometric parallax" ], "ip_addr": "216.73.216.238", "data_access": "v-f" }