机译:The fourth US naval observatory ccd astrograph catalog (UCAC4)
U.S. Naval Observatory, 3450 Massachusetts Avenue NW, Washington, DC 20392, United States;
Naval Observatory Flagstaff Station (NOFS), 10391 West Naval Observatory Road, Flagstaff, AZ 86001, United States;
AAVSO, 49 Bay State Road, Cambridge, MA 02138, United StatesDepartment of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520, United States;
astrometry; catalogs; reference systems; stars: kinematics and dynamics;