THE FOURTH US NAVAL OBSERVATORY CCD ASTROGRAPH CATALOG (UCAC4)

• Published in: The Astronomical journal Vol. 145; no. 2; pp. 1 - 14
• Main Authors: Zacharias, N, Finch, C T, Girard, T M, Henden, A, Bartlett, J L, Monet, D G, Zacharias, M I
• Format: Journal Article
• Language: English
• Published: United States 01.02.2013
• Subjects: ACCURACY; APERTURES; Astronomical bodies; Astronomical catalogs; ASTRONOMY; ASTROPHYSICS; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CHARGE-COUPLED DEVICES; COORDINATES; ERRORS; Lenses; Naval; NEAR INFRARED RADIATION; PHOTOMETRY; Position measurement; PROPER MOTION; SOUTHERN HEMISPHERE; STARS

UCAC4 is an updated version of UCAC3 with about the same number of stars also covering all-sky. Bugs were fixed, Schmidt plate survey data were avoided, and precise five-band photometry was added for about half the stars. Astrograph observations have been supplemented for bright stars by FK6, Hippar...