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HD 197559


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Photoelectric Photometry of Stars in the Vilnius System in the Area of the North America and Pelican Nebulae
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Ultraviolet television data from the orbiting astronomical observatory. II - Stellar ultraviolet colors and interstellar extinction
The results from the Celescope Catalog of Ultraviolet StellarObservations (Davis, Deutschman, and Haramundanis 1973) are studied,emphasizing statistical groups and subgroups of stars. In spite of therather large observational errors, the great number of Celescopeobservations make it possible to do that kind of study with reasonableaccuracy. Some stars have ultraviolet colors that differ significantlyfrom those of the group to which they have been assigned on the basis ofground-based observations. An attempt is made to describe the generalproperties of the ultraviolet colors of the stars as observed by theCelescope experiment on board NASA's Orbiting Astronomical Observatory(OAO-2). Besides the direct applicability of these results to thegeneral study of stellar atmospheres and of interstellar extinction,they are also considered as a frame of reference for further studies ofindividual stars and groups of stars.

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Observation and Astrometry data

Constellation:Cygnus
Right ascension:20h42m54.24s
Declination:+43°10'38.7"
Apparent magnitude:8.466
Distance:377.358 parsecs
Proper motion RA:0.1
Proper motion Dec:1.5
B-T magnitude:8.422
V-T magnitude:8.463

Catalogs and designations:
Proper Names
HD 1989HD 197559
TYCHO-2 2000TYC 3178-699-1
USNO-A2.0USNO-A2 1275-14069732
HIPHIP 102232
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