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Start Over Subject astrometry Instrument Gaia
1. Gaia catalog release 2
ID:
ivo://vopdc.obspm/gepi/gaia
Title:
Gaia catalog release 2
Short Name:
Gaia
Date:
14 Nov 2018 00:30:00
Publisher:
Paris Astronomical Data Centre - GEPI
Description:
The second Gaia data release, Gaia DR2, encompasses astrometry, photometry, radial velocities, astrophysical parameters (stellar effective temperature, extinction, reddening, radius, and luminosity), and variability information for up to 1.6 billion stars. Gaia DR2 is based on the first 22 months of the nominal, five-year mission, processed by the Gaia Data Processing and Analysis Consortium (DPAC).
2. The HSOY Catalog
ID:
ivo://org.gavo.dc/hsoy/q/q
Title:
The HSOY Catalog
Short Name:
HSOY SCS
Date:
27 Dec 2024 08:31:06
Publisher:
The GAVO DC team
Description:
HSOY is a catalog of 583'001'653 objects with precise astrometry based on PPMXL and Gaia DR1. Typical formal errors at mean epoch in proper motion are below 1 mas/yr for objects brighter than 10 mag, and about 5 mas/yr at the faint end (about 20 mag). South of -30 degrees, astrometry is significantly worse. HSOY also contains, where available, USNO-B, Gaia, and 2MASS photometry. HSOY's positions and proper motions are given for epoch J2000. The catalog becomes severely incomplete faintwards of 16 mag in the G-band. The mean epochs are typically very close to Gaia's J2015. HSOY still contains about 0.7% spurious close "binaries" (non-matched stars) from the original USNO-B (marked with non-NULL clone). Also, failed matches within Gaia DR1 contribute another 1.5% spurious pairs (marked with non-NULL comp). In both cases, astrometry presumably is sub-standard. More information is available at http://dc.g-vo.org/hsoy.