The Second US Naval Observatory CCD Astrograph Catalog (UCAC2)
The Second US Naval Observatory CCD Astrograph Catalog (UCAC2)
The second US Naval Observatory (USNO) CCD Astrograph Catalog, UCAC2 was released in 2003 July. Positions and proper motions for 48,330,571 sources (mostly stars) are available on 3 CDs, supplemented with Two Micron All Sky Survey photometry for 99.5% of the sources. The catalog covers the sky area from -90° …