Subject: stars / Validation Level: 2 - STScI NAVO Directory Search Results

ID:: ivo://org.gavo.dc/supercosmos/q/s
Title:: SuperCOSMOS Sources
Short Name:: supercosmos scs
Date:: 27 Dec 2024 08:31:02
Publisher:: The GAVO DC team
Description:: The SuperCOSMOS data primarily originate from scans of the UK Schmidt and Palomar POSS II blue, red and near-IR sky surveys. The ESO Schmidt R (dec < -17.5) and Palomar POSS-I E (dec > -17.5) surveys have also been scanned and provide an early (1st) epoch red measurement. Mirrored here is the source table containing four-plate multi-colour, multi-epoch data which are merged into a single source catalogue for general science exploitation. Within the GAVO DC, some column names have been adapted to local customs (primarily positions, proper motions).

ID:: ivo://org.gavo.dc/tgas/q/main
Title:: TGAS catalogue
Short Name:: tgas.main
Date:: 27 Dec 2024 08:31:05
Publisher:: The GAVO DC team
Description:: This table is a subset of GaiaSource comprising those stars in the Hipparcos and Tycho-2 Catalogues for which a full 5-parameter astrometric solution has been possible in Gaia Data Release 1. This is possible because the early Hipparcos epoch positions break some degeneracies due to the limited Gaia time coverage. This table contains a substantial fraction of the around 2.5 million stars in the Hipparcos and Tycho-2 catalogue. Many stars have been excluded due to several reasons, such as saturation, cross-match errors or bad astrometric solution. All rows have Gaia solution id 1635378410781933568.

ID:: ivo://org.gavo.dc/urat1/q/main
Title:: The first U.S. Naval Observatory Astrometric Robotic Telescope Catalog URAT1 star catalog
Short Name:: urat1.main
Date:: 27 Dec 2024 08:31:00
Publisher:: The GAVO DC team
Description:: URAT1 is an observational catalog at a mean epoch between 2012.3 and 2014.6; ot covers the magnitude range 3 to 18.5 in R-band, with a positional precision of 5 to 40 mas. It covers most of the northern hemisphere and some areas down to -24.8° in declination. In the GAVO data center, we left out all columns originating from cross matches with other catalogs; on-the fly crossmatches can be done in our TAP service.

ID:: ivo://org.gavo.dc/ucac4/q/s
Title:: The fourth U.S. Naval Observatory CCD Astrograph Catalog (UCAC4)
Short Name:: ucac4 scs
Date:: 27 Dec 2024 08:31:12
Publisher:: The GAVO DC team
Description:: UCAC4 is a compiled, all-sky star catalog covering mainly the 8 to 16 magnitude range in a single bandpass between V and R. Positional errors are about 15 to 20 mas for stars in the 10 to 14 mag range. Proper motions have been derived for most of the about 113 million stars utilizing about 140 other star catalogs with significant epoch difference to the UCAC CCD observations. These data are supplemented by 2MASS photometric data for about 110 million stars and 5-band (B,V,g,r,i) photometry from the APASS (AAVSO Photometric All-Sky Survey) for over 50 million stars. UCAC4 also contains error estimates and various flags. All bright stars not observed with the astrograph have been added to UCAC4 from a set of Hipparcos and Tycho-2 stars. Thus UCAC4 should be complete from the brightest stars to about R=16, with the source of data indicated in flags.

ID:: ivo://svo.cab/cat/gbs
Title:: The Gaia FGK Benchmark Stars
Short Name:: Gaia Benchmarks
Date:: 03 Jun 2020 15:29:07
Publisher:: SVO/CAB
Description:: The Gaia FGK Benchmark Stars. Library of high resolution and high signal to noise ratio stellar spectra.

ID:: ivo://org.gavo.dc/gps1/q/cone
Title:: The Gaia-PS1-SDSS (GPS1) Proper Motion Catalog
Short Name:: GPS1
Date:: 27 Dec 2024 08:31:00
Publisher:: The GAVO DC team
Description:: This catalog combines Gaia DR1, Pan-STARRS 1, SDSS and 2MASS astrometry to compute proper motions for 350 million sources across three-fourths of the sky down to a magnitude of mr≈20. Positions of galaxies from Pan-STARRS 1 are used to build a reference frame for PS1, SDSS, and 2MASS data. Gaia DR1 is adapted to that reference frame by exploiting that locally, proper motions are linear. GPS1 has a characteristic systematic error of less than 0.3 mas/yr, and a typical precision of 1.5−2.0 mas/yr. The proper motions have been validated using galaxies, open clusters, distant giant stars and QSOs. In comparison with other published faint proper motion catalogs, GPS1's systematic error (<0.3 mas/yr) is about 10 times better than that of PPMXL and UCAC4 (>2.0 mas/yr). Similarly, its precision (~1.5 mas/yr) is an improvement by ∼ 4 times relative to PPMXL and UCAC4 (∼6.0 mas/yr). For QSOs, the precision of GPS1 is found to be worse (∼2.0−3.0 mas/yr), possibly due to their particular differential chromatic refraction (DCR).

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