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Table: usno.a2
(The bold columns are indexed columns)
Column NameDescriptionDatatype
actflagDoes star belong to ACTCHAR
bmagMagnitude from blue plateREAL
dej2000Declination (ICRS) of blue/red platesDOUBLE
dej2000_Declination (sexagesimal)CHAR
epochMean epoch of positionREAL
htm9HTM index (order 9 => ~10 arcmin size)BIGINT
idOriginal designation in USNO-A2 catalogCHAR
mflagMagnitudes are probably wrongCHAR
nest256HEALPIX index (Nsides 256 => ~14 arcmin size)INTEGER
raj2000Right Ascension (ICRS) of blue/red platesDOUBLE
raj2000_Right Ascension (sexagesimal)CHAR
ring256Ring-scheme HEALPix (Gorski et al. 2005) index with NSIDE=256 (~14 arcmin resolution)INTEGER
rmagMagnitude from red plateREAL