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HD 172016


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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:Τοξότης
Right ascension:18h39m17.88s
Declination:-34°09'58.7"
Apparent magnitude:6.645
Distance:225.734 parsecs
Proper motion RA:-0.2
Proper motion Dec:-13.5
B-T magnitude:6.656
V-T magnitude:6.646

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 172016
TYCHO-2 2000TYC 7415-4011-1
USNO-A2.0USNO-A2 0525-37755185
HIPHIP 91466

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