Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21347305f&link_type=abstract
American Astronomical Society, AAS Meeting #213, #473.05; Bulletin of the American Astronomical Society, Vol. 41, p.427
Astronomy and Astrophysics
Astronomy
3
Scientific paper
All sky observations of the USNO CCD Astrograph Catalog were completed in 2004. The final data release, UCAC3, will become available in 2009. A complete re-reduction of the pixel data (over 250,000 frames taken at Cerro Tololo and Naval Observatory Flagstaff station) has been completed in March 2008. The Two Micron All Sky Survey (2MASS) is used to probe the UCAC data for systematic errors. The Tycho-2 stars are used as reference frame for the final reductions and ICRF QSOs are utilized for the extragalactic reference frame link of UCAC3.
UCAC3 will go slightly deeper than UCAC2 and will have improved astrometry and photometry for about 80 million stars in the R = 8 to 16 mag range. In addition to the early epoch data used for the UCAC2 proper motions, UCAC3 utilizes about 5000 astrograph plates with previously unpublished positions as well as a complete re-reduction of the NPM and SPM first epoch data to lower the systematic errors of UCAC3 proper motions significantly.
Minor planets and high proper motion stars have been identified. Double stars have been detected and properly fit. UCAC3 will be a compiled catalog of mean positions and proper motions, similar to UCAC2, however individual epoch observations of stars as well as processed images (pixel data) could be made public after the catalog release.
Finch Charlie T.
Girard TA
Wycoff Gary
Zacharias Marion I.
Zacharias Norbert
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