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HD 169657


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UBV photometry of HD stars in the fields of selected cataclysmic variables.
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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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观测天体数据

星座:人馬座
右阿森松:18h26m41.71s
赤纬:-23°26'08.3"
视星:7.899
距离:1587.302 天文距离
右阿森松适当运动:-0.3
赤纬适当运动:-0.7
B-T magnitude:8.034
V-T magnitude:7.911

目录:
适当名称   (Edit)
HD 1989HD 169657
TYCHO-2 2000TYC 6857-1048-1
USNO-A2.0USNO-A2 0600-33535724
HIPHIP 90400

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