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HD 173556


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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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Osservazione e dati astrometrici

Costellazione:Sagittario
Ascensione retta:18h47m23.70s
Declinazione:-32°38'51.6"
Magnitudine apparente:8.729
Distanza:421.941 parsec
Moto proprio RA:1
Moto proprio Dec:-7.2
B-T magnitude:8.818
V-T magnitude:8.737

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 173556
TYCHO-2 2000TYC 7412-1287-1
USNO-A2.0USNO-A2 0525-38361450
HIPHIP 92197

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