| I/254/out | The HST Guide Star Catalog, Version 1.2 (Lasker+ 1996) The Full Catalogue (25241730 positions) (25241730 rows) | GSC=0357506350 |
Note: The Guide Star Catalog has been constructed to support the operational need of the Hubble Space Telescope. It contains over 25 million positions for about 19 million objects, of which more than 15 million are classified as stars. The version 1.2 is a new astrometric reduction which results in absolute position errors about 0.3-0.4 arcsec. (see GSC pages at URL http://www-gsss.stsci.edu/gsc/gsc.html)
| Column | Value | Explain (UCD) | |
| _RAJ2000 | 20 53 18.6096 | "h:m:s" | Right ascension (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.ra) |
| _DEJ2000 | +45 10 54.300 | "d:m:s" | Declination (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.dec) |
| _RAB1950 | 20 51 33.7323 | "h:m:s" | Right ascension (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.ra) |
| _DEB1950 | +44 59 29.626 | "d:m:s" | Declination (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.dec) |
| _Glon | 085.5203535 | deg | Galactic longitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lon) |
| _Glat | +00.3073501 | deg | Galactic latitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lat) |
| GSC | 0357506350 | (i) GSC designation (Note) (meta.id;meta.main) | |
| RAJ2000 | 313.32754 | deg | (i) Right ascension in J2000, epoch of plate (pos.eq.ra;meta.main) |
| DEJ2000 | +45.18175 | deg | (i) Declination in J2000, epoch of plate (pos.eq.dec;meta.main) |
| PosErr | 0.1 | arcsec | Mean error on position (stat.error) |
| Pmag | 5.40 | mag | (i) photographic magnitude (see n_Pmag) (phot.mag;em.opt) |
| e_Pmag | 0.28 | mag | Mean error on photographic magnitude (stat.error;phot.mag;em.opt.U) |
| n_Pmag | 4 | [0,18] Coded passband for magnitude (Note) (meta.note) | |
| Class | 0 | [0,3] Class of object (0=star; 3=non-stellar) (src.class) | |
| Plate | +056 | Plate designation (Note) (obs.field) | |
| Epoch | yr | Epoch of plate (Note) (time.epoch) | |
| Mult | T | [TF] True if multiple object / False otherwise (meta.code.multip) | |
| Versions | GSC-all | Get parameters of that star from all GSC versions (meta.ref.url) | |
| Column | Value | Explain (UCD) | |
| _RAJ2000 | 20 53 18.3240 | "h:m:s" | Right ascension (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.ra) |
| _DEJ2000 | +45 10 57.216 | "d:m:s" | Declination (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.dec) |
| _RAB1950 | 20 51 33.4490 | "h:m:s" | Right ascension (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.ra) |
| _DEB1950 | +44 59 32.557 | "d:m:s" | Declination (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.dec) |
| _Glon | 085.5204368 | deg | Galactic longitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lon) |
| _Glat | +00.3085132 | deg | Galactic latitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lat) |
| GSC | 0357506350 | (i) GSC designation (Note) (meta.id;meta.main) | |
| RAJ2000 | 313.32635 | deg | (i) Right ascension in J2000, epoch of plate (pos.eq.ra;meta.main) |
| DEJ2000 | +45.18256 | deg | (i) Declination in J2000, epoch of plate (pos.eq.dec;meta.main) |
| PosErr | 0.3 | arcsec | Mean error on position (stat.error) |
| Pmag | 4.53 | mag | (i) photographic magnitude (see n_Pmag) (phot.mag;em.opt) |
| e_Pmag | 0.40 | mag | Mean error on photographic magnitude (stat.error;phot.mag;em.opt.U) |
| n_Pmag | 1 | [0,18] Coded passband for magnitude (Note) (meta.note) | |
| Class | 0 | [0,3] Class of object (0=star; 3=non-stellar) (src.class) | |
| Plate | 00C8 | Plate designation (Note) (obs.field) | |
| Epoch | 1983.675 | yr | Epoch of plate (Note) (time.epoch) |
| Mult | T | [TF] True if multiple object / False otherwise (meta.code.multip) | |
| Versions | GSC-all | Get parameters of that star from all GSC versions (meta.ref.url) | |
