6/24/2023 0 Comments Gaia project extension![]() ![]() * TGAS = Tycho-Gaia Astrometric Solution, also referred to as primary solution for primary sources. Gaia DR1 is based on observations collected between 25 July 2014 and 16 September 2015. ![]() 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.Positions (α, δ) and G magnitudes for 2152 ICRF quasars ( F.Photometric data of selected RR Lyrae and Cepheid variable stars including these high-cadence measurements are contained in Gaia DR1. 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.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). The five-parameter astrometric solution - position, parallax, and proper motion - for stars in common between the Tycho-2 Catalogue and Gaia is contained in Gaia DR1.Positions and individual uncertainties are computed using a generic prior and Bayes' rule (detailed description in "Gaia astrometry for stars with too few observations. Positions (α, δ) and G magnitudes for all sources with acceptable formal standard errors on positions.The Gaia Archive can be reached at /gaia. A list of Gaia DR1 A&A papers is available below. This page presents the contents of Gaia DR1, DR1 statistical information, uncertainty statistics as well as a summary of the limitations of the first data release.
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