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HD 121862


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A W UMa variable in the visual binary system ADS 9019 - A UBV photoelectric investigation
UBV and light curve data on the binary system ADS 9019 are reported andthe geometry of the pair is discussed. The 1950.0 coordinates,magnitudes, colors and HD spectral types for the binary, a comparisonand a check star are furnished, along with 402 UBV observations of thenonvarying ADS 9019 primary. Orbital elements were employed to generatetheoretical light curves. The data indicate an almost identical pair,one being slightly smaller and cooler than the other. The constant lightvariation with strongly inflected maxima and minima of equal depthcategorizes the object as a W UMa contact binary.

The Discovery of a W Ursae Majoris Variable in the Visual Binary System ADS 9019
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Observation and Astrometry data

Constellation:Virgo
Right ascension:13h57m56.78s
Declination:+05°07'03.8"
Apparent magnitude:7.122
Distance:205.761 parsecs
Proper motion RA:-11.8
Proper motion Dec:-18.4
B-T magnitude:8.26
V-T magnitude:7.216

Catalogs and designations:
Proper Names
HD 1989HD 121862
TYCHO-2 2000TYC 315-262-1
USNO-A2.0USNO-A2 0900-07538496
HIPHIP 68215
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