UCAC4 Catalogue

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...UCAC4是一部汇编而成的全天星表，主要覆盖V波段与R波段之间单通带内8至16星等的区间。针对……范围内的恒星，其位置误差约为15至20毫角秒（mas）。