Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..177z&link_type=abstract
Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 177-180
Astronomy and Astrophysics
Astronomy
8
Scientific paper
The U.S. Naval Observatory CCD Astrograph Catalogue (UCAC-S) project is planned to start in the second half of 1997 at Cerro Tololo (CTIO) in Chile. This program will cover the entire Southern Hemisphere with a 2-fold overlap pattern to 16 mag. Within 2 years about 40 million stars will have been observed. A catalogue accuracy of 20 mas per coordinate is expected for stars in the 7 to 13.5 magnitude range, increasing to about 70 mas at the limiting magnitude. A 4k CCD camera will be used with the 5-element 206 mm lens in a 579-642 nm bandpass, covering 1 square degree at 0.9 arcsec/pixel. Dark and flat field tests revealed the high cosmetic quality of the Kodak CCD chip. The telescope is currently being upgraded for automatic operation and test observations are underway at the Washington DC site before relocation. Tycho stars will be used for preliminary reductions, and a direct tie to the Hipparcos stars will be feasible using block adjustment techniques. In addition to the program fields, minor planet and calibration field observations as well as longer exposures around extragalactic reference frame sources are planned. Thus an extension of the Hipparcos frame exceeding the density of the Guide Star Catalog but with an accuracy similar to the Tycho Catalogue will be achieved. The catalogue will have an impact on deriving proper motions and will provide faint reference stars for current and future requirements for large telescope CCD observations.
Germain Marvin E.
Rafferty Theodore J.
Zacharias Norbert
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