Table · dataset · 2016
Gaia DR1
Listed in Gaia@AIP
Description
<h3>Update</h3> <p>In order to be consistent with the naming of the ESAC Archive the name of the schema (database) holding the data of Gaia data release 1 has been modified on the 3rd of December 2020 from <code>gdr1</code> to <code>gaiadr1</code>.</p> <h4>Content of DR1</h4> <ul> <li>Positions (α, δ) and G magnitudes for all sources with acceptable formal standard errors on positions. Positions and individual uncertainties are computed using a generic prior and Bayes" rule (detailed description in "Gaia astrometry for stars with too few observations.
A Bayesian approach").</li> <li>The five-parameter astrometric solution - positions, parallaxes, and proper motions - for stars in common between the Tycho-2 Catalogue and Gaia is contained in Gaia DR1. This part of Gaia DR1 is based on the Tycho-Gaia Astrometric Solution (Image of the Week with short TGAS description; paper with a more detailed description; paper describing theory and background; paper describing quasar extension).</li> <li>At the beginning of the routine phase, for a period of 4 weeks, a special scanning mode repeatedly covering the ecliptic poles on every spin was executed for calibration purposes.
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Photometric data of selected RR Lyrae and Cepheid variable stars including these high-cadence measurements are contained in Gaia DR1.</li> <li>Positions (α, δ) and G magnitudes for 2152 ICRF quasars (F. Mignard et al., 2016). Cross-matches will be provided between Gaia sources on the one hand and Hipparcos-2, Tycho-2, 2MASS PSC, GSC2.3, PPM-XL, UCAC-4, SDSS DR10 / DR12, AllWISE, and URAT-1 data on the other hand.</li> </ul> Gaia DR1 is based on observations collected between 25 July 2014 and 16 September 2015. <img style="width: 100%;" src="gaia.aip.de/cms/wp-content/uploads/2017/02/gdr1_density_map.png" alt="Density map for gaiadr1.gaia_source (number of sources per square degree).
Healpix based (nside 512, 3.14Mpixels) " /> <i>Density map for gaiadr1.gaia_source (number of sources per square degree). Healpix based (nside 512, 3.14Mpixels)</i> <h4>Source numbers</h4> <table class="table table-bordered"> <tbody> <tr> <td>Total number of sources</td> <td>1,142,679,769</td> </tr> <tr> <td>Number of TGAS* sources</td> <td>2,057,050</td> </tr> <tr> <td>- Hipparcos</td> <td>93,635</td> </tr> <tr> <td>- Tycho-2</td> <td>1,963,415</td> </tr> <tr> <td>Number of secondary sources**</td> <td>1,140,622,719</td> </tr> <tr> <td>Number of light curves for Cepheids</td> <td>599</td> </tr> <tr> <td>Number of light curves for RR Lyrae</td> <td>2595</td> </tr> </tbody> </table> <h4>Magnitude distribution percentiles (G)</h4> <table class="table table-bordered"> <tbody> <tr> <td>0.135%</td> <td>11.2</td> </tr> <tr> <td>2.275%</td> <td>14.5</td> </tr> <tr> <td>15.866%</td> <td>17.1</td> </tr> <tr> <td>50%</td> <td>19.0</td> </tr> <tr> <td>84.134%</td> <td>20.1</td> </tr> <tr> <td>97.725%</td> <td>20.7</td> </tr> <tr> <td>99.865%</td> <td>21.0</td> </tr> </tbody> </table> <em>* TGAS = Tycho-Gaia Astrometric Solution, also referred to as primary solution for primary sources.</em> <em>** The astrometric solution of secondary sources (non-TGAS sources) is derived using the calibrations of the spacecraft attitude and the geometry of the instrument as `fixed" input, as derived from the astrometric solution of primary sources (i.e., the TGAS solution).</em> Source: <a href="cosmos.esa.int/web/gaia/dr1">http://www.cosmos.esa.int/web/gaia/dr1</a>
Links
Where it is published
- DOI doi.org/10.17876/gaia/dr.1 ↗
DOI / persistent id · from gaia aip de
Catalogue records · 1
- OAI-PMH record gaia.aip.de/oai?verb=GetRecord&metadataPrefix=oai_dc&identifier=oai%3Agaia… ↗
metadata API · from gaia aip de
Topics
- From keywords
- Astronomy & Astrophysics · Earth & Environmental Science · Physics
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| Gaia@AIP | oai:gaia.aip.de:schemas/gaiadr1 | 13 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| concepts[field].local:field:astronomy | mapping · gaia aip de | connector:gaia_aip_de@1.0.0 | |
| concepts[field].local:field:earth-environmental | mapping · gaia aip de | connector:gaia_aip_de@1.0.0 | |
| concepts[field].local:field:physics | mapping · gaia aip de | connector:gaia_aip_de@1.0.0 | |
| concepts[modality].local:modality:image | enrichment · gaia aip de | keyword-concept-rules@1.0.0 | title+description (75%) |
| concepts[modality].local:modality:tabular | enrichment · gaia aip de | keyword-concept-rules@1.0.0 | title+description (65%) |
| description | source · gaia aip de | connector:gaia_aip_de@1.0.0 | /metadata/dc/description |
| license_text | source · gaia aip de | connector:gaia_aip_de@1.0.0 | |
| publication_date | source · gaia aip de | connector:gaia_aip_de@1.0.0 | |
| title | source · gaia aip de | connector:gaia_aip_de@1.0.0 | /metadata/dc/title |