UCAC4
Год выпуска: 2012 г.
Разработчик: U.S. Naval Observatory
Сайт разработчика:
http://www.usno.navy.mil
Язык интерфейса: Английский
Таблэтка: не требуется
Описание: UCAC4 is a compiled, all-sky star catalog covering mainly the 8 to 16
magnitude range in a single bandpass between V and R. Positional
errors are about 15 to 20 mas for stars in the 10 to 14 mag range.
Proper motions have been derived for most of the about 113 million
stars utilizing about 140 other star catalogs with significant epoch
difference to the UCAC CCD observations. These data are supplemented
by 2MASS photometric data for about 110 million stars and 5-band
(B,V,g,r,i) photometry from the APASS (AAVSO Photometric All-Sky
Survey) for over 50 million stars. UCAC4 also contains error estimates
and various flags. All bright stars not observed with the astrograph
have been added to UCAC4 from a set of Hipparcos and Tycho-2 stars.
Thus UCAC4 should be complete from the brightest stars to about R=16,
with the source of data indicated in flags. UCAC4 also provides a link
to the original Hipparcos star number with additional data such as
parallax found on a separate data file included in this release.
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