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Table: usno.a2
(The bold columns are indexed columns)
| Column Name | Description | Datatype |
|---|---|---|
| actflag | Does star belong to ACT | CHAR |
| bmag | Magnitude from blue plate | REAL |
| dej2000 | Declination (ICRS) of blue/red plates | DOUBLE |
| dej2000_ | Declination (sexagesimal) | CHAR |
| epoch | Mean epoch of position | REAL |
| htm9 | HTM index (order 9 => ~10 arcmin size) | BIGINT |
| id | Original designation in USNO-A2 catalog | CHAR |
| mflag | Magnitudes are probably wrong | CHAR |
| nest256 | HEALPIX index (Nsides 256 => ~14 arcmin size) | INTEGER |
| raj2000 | Right Ascension (ICRS) of blue/red plates | DOUBLE |
| raj2000_ | Right Ascension (sexagesimal) | CHAR |
| ring256 | Ring-scheme HEALPix (Gorski et al. 2005) index with NSIDE=256 (~14 arcmin resolution) | INTEGER |
| rmag | Magnitude from red plate | REAL |
