Other
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dda....31.0510m&link_type=abstract
American Astronomical Society, DDA meeting #31, #05.10
Other
Scientific paper
The second generation Guide Star catalog (GSC II) is being constructed at STScI in collaboration with Osservatorio Astronomico di Torino to support the operations of current and future ground and space based telescopes. This catalog will be an all-sky catalog of positions, proper motions, magnitudes and colors to the plate limit, however for operational purposes the goal is 18th magnitude. The GSC-II is based on STScI digitized Schmidt survey plates from the modern POSS-II (J and F plates), ER, and SES surveys along with the older epoch POSS-I, Palomar Quick-V and UK Schmidt J and EJ surveys. The photometric reference catalogs used to calibrate the plates are the TYCHO catalogue and the second Guide Star Photometric Catalog (GSPC-II). The GSPC-II, an extension of the GSPC-I catalog, is comprised of CCD observations that will provide a set of standard stars to at least 18th magnitude over the entire sky for each Schmidt plate. The anticipated completion date for the GSPC-II catalog is the end of 1999. The final GSC-II catalog will be on the ICRF reference frame as represented by the USNO ACT catalog, however the majority of the plates processed thus far are on the PPM system. The enormous amount data are organized in the COMPASS database. COMPASS, an object-oriented system with an estimated size at completion of 4 Tbytes, is structured for optimizing calibrations and supports consistent object naming between plates, as well as cross-matching with other optical surveys and with data from other wavebands. A much smaller "export" catalog, in ESO SkyCat format, will also be produced. In this paper we represent the current status of the GSC-II catalog, emphasizing the astrometric and photometric calibrations.
McLean Brian
Morrison Jason
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