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The S201 far-ultraviolet imaging survey. III - A field in Sagittarius
Far-ultraviolet imagery of a 20 deg diameter field in Sagittarius,centered near (1950) R.A. 18 h 34 m, decl. -30 deg 25 arcmin, wasobtained by the S201 far-ultraviolet camera during the Apollo 16mission. In a 10-minute exposure covering the 1250-1600 A wavelengthrange, 1034 star images are detectable, with a limiting ultravioletmagnitude of about 10. Most of these objects are identified withearly-type stars listed in the Smithsonian Astrophysical ObservatoryStar Catalog, the Catalog of Stellar Identifications, or both, but 203objects remain unidentified or are identified with late-type stars. Thephotometric measurements appear to be in reasonable agreement with thoseof the International Ultraviolet Explorer for stars in common, and withexpectations for A0 stars. A detailed photometric study was made of theMessier 8 region, and it is concluded that dust-scattered starlightcontributes about half of the total radiation observed from the centralregion of M8.
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Observation and Astrometry data
| Constellation: | Sagittarius |
| Right ascension: | 18h54m07.79s |
| Declination: | -22°34'13.3" |
| Apparent magnitude: | 7.636 |
| Distance: | 684.932 parsecs |
| Proper motion RA: | -3.3 |
| Proper motion Dec: | -7.8 |
| B-T magnitude: | 7.708 |
| V-T magnitude: | 7.642 |
Catalogs and designations:
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