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Coordinate Keywords used in MAST FITS Files
In general, data sets archived within MAST use Right Ascension and
Declination to specify target coordinates, although the keywords
used to designate the coordinates vary.
The table below summarizes these differences.
For more information on file formats, click on the
mission names.
| Mission | Coordinate Keywords* | Equinox | Units |
|---|---|---|---|
| Copernicus | RA-DEGS | 2000 | decimal degrees |
| BEFS | RA_OBJ | 2000 | decimal degrees |
| EUVE | RA_OBJ, RA_PNT | 2000 | decimal degrees |
| FUSE | RA_APER, RA_TARG | 2000 | decimal degrees |
| HUT | (none) | - | - |
| IMAPS | RA | 2000 | decimal degrees |
| IUE | LRA, SRA, LTARGRA, STARGRA | 1950 | decimal degrees |
| UIT | NOMRA | 1950/2000 | decimal degrees |
| WUPPE | RA | 1950 | decimal degrees |
*Keyword Explanation:
- RA-DEGS- RA in degrees,
- RA_OBJ - RA of object (provided by Guest Observer),
- RA_PNT- RA of pointing (indicates slight offset needed for EUVE observations),
- RA_APER- RA at center of aperture,
- RA_TARG- RA of target,
- LRA,SRA- IUE Large and Small Aperture RA (homogeneous coordinates derived from Simbad),
- LTARGRA,STARGRA- IUE Large and Small Aperture RA provided by Guest Observer,
- NOMRA- UIT nominal RA
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