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HD 163697


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Photometry of astrometric reference stars
UBVRI, DDO, and uvby, H-beta photometry of astrometric reference starsis presented. Spectral types and luminosity classifications made fromthe colors are used to determine their spectroscopic parallaxes. In thispaper, colors for 309 stars in 25 regions are given, and classificationsfor 210 stars have been made. These stars form reference frames in theAllegheny Observatory Multichannel Astrometric Photometer astrometricprogram, and in the Praesepe cluster reduced by Russell (1976). It isfound that the present photometric spectral types are reliable to within2.5 spectral subclasses.

Spectral types and luminosity classifications of MAP region stars using UBVRI and DDO photometry
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1989AJ.....98.1768C&db_key=AST

Period change in the eclipsing binary V566 Oph.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1977PASP...89...47D&db_key=AST

Curva di luce ed orbita fotoelettrica della variabile ad eclisse V 566 Ophiuchi
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观测天体数据

星座:蛇夫座
右阿森松:17h57m19.88s
赤纬:+04°53'14.8"
视星:8.665
距离:156.74 天文距离
右阿森松适当运动:-17.3
赤纬适当运动:-14.5
B-T magnitude:9.433
V-T magnitude:8.729

目录:
适当名称   (Edit)
HD 1989HD 163697
TYCHO-2 2000TYC 425-22-1
USNO-A2.0USNO-A2 0900-11032132
HIPHIP 87901

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