NOAO >   Observing Info >   Approved Programs >   2005B-0139

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Proposal Information for 2005B-0139


PI: Brian McLean, Space Telescope Science Institute, mclean@stsci.edu
Address: Archive Sciences Branch, 3700 San Martin Drice, Baltimore, Maryland 21218, USA

CoI: Beatrice Bucciarelli, Astronomical Observatory of Turin INAF, Italy
CoI: Jorge Garcia Yus, Gemini Southern Observatory, Chile
CoI: Spagna Alessandro, Astronomical Observatory of Turin INAF, Italy
CoI: Charles Loomis, STScI, USA

Title: Photometric Calibrators for the Second-Generation Palomar Sky Surveys

Abstract: The GSC-II is an all-sky astro-photometric catalogue based on 1 arcsec resolution scans of photographic sky-survey plates from the Palomar and UK-Schmidt telescopes. Its latest iteration (GSC2.3) includes positions, proper motions, and photographic photometry (blue J,red F and near-IR N) of nearly 1 billion objects (comprising stars and galaxies) down to a limiting magnitude of J~eq 22 and F~eq 20.5. Besides its obvious applications for telescope operations and space missions planning, the all-sky properties of GSC-II make it a highly valuable tool for a wide range of astrophysical investigations and data mining. An essential element in the photometric calibration task is the availability of in-situ standard photometric sequences for measuring the sensitivity of each emulsion/plate, which allow to obtain an accuracy of about 0.15 mag over the entire plate. The collection of such sequences (a total of ~ 1780) has been a major effort in the context of this project, summarized by the construction of the CCD-based, photometric catalogue GSPC-II. With this proposal we are addressing the remaining 86 northern fields still lacking photometric calibrators, most of which correspond to POSS-II plates whose centers are falling in the vignetted area of the original POSS-I grid, and therefore necessitate additional photometric standards.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



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