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Properties of the GSC 2.3 release

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Mem. S.A.It. Vol. 77, 1166

SAIt 2006 c Memorie

della

The Guide Star Catalog II

Properties of the GSC 2.3 release

A. Spagna 1 , M.G. Lattanzi 1 , B. McLean 2 , B. Bucciarelli 1 , D. Carollo 1 , R. Drimmel 1 , G. Greene 2 , R. Morbidelli 1 , R. Pannunzio 1 , M. Sarasso 1 , R. Smart 1 , and A. Volpicelli 1

1

INAF – Osservatorio Astronomico di Torino, I-10025 Pino Torinese, Italy

2

Space Telescope Science Institute, Baltimore MD 21218, USA

Abstract. The Guide Star Catalog II (GSC-II) is a joint project of the STScI (Baltimore) and INAF-OATo (Italy) for the construction of an all-sky astronomical catalogue containing position, multicolour photometry, classification and proper motions for 1 billion of stars and galaxies down to R∼20 mag. Astrometric and photometric data have been derived from the analysis and calibrations of about 8000 digitized Schmidt plates of the Palomar and AAO surveys. This material makes up a formidable data set for the hunt of rare targets as late type stars, white dwarfs, etc. (see eg. Carollo et al. 2006, A&A, 448, 579), as well as for the study of the main galactic stellar populations of the thin/thick disk and the halo (see eg. Vallenari et al. 2006, A&A 451,125). The last public release, GSC 2.3, contains positions, photo- graphic photometry B

J

, R

F

, I

N

, and classification for approximately 997,028,547 entries extracted from the complete GSC-II database. GSC 2.3 is currently used for HST Bright Object Protection and it replaces GSC-I for HST pointing since cycle 15. Public access to this catalog is available through a web form at STScI and OATo, or via the services provided by the National VO. Here we describe the properties of GSC 2.3 and discuss its astromet- ric and photometric accuracy with respect to other large surveys (DENIS, SDSS, UCAC2, USNO-B).

Key words. catalogs – surveys – astrometry – photometry – Galaxy: stellar content

Send offprint requests to: A. Spagna

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