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HD 218934


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New Photoelectric Light Curves of AB Andromedae
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Photoelectric observations of W UMa stars - U Pegasi and AB Andromedae
The quadratic ephemerides of the W UMa systems U Pegasi and ABAndromedae are computed from photoelectric and photometric data toanalyze the objects' periodicities. The minima obtained for the presentwork are incorporated into the minima obtained by Lafta and Grainger(1986) for the quadratic ephemerides calculation. U Pegasi is found tohave a decreasing period with a rate of change of -0.91 s/century, whileAB Andromedae increases steadily at 0.83 s/century, and the existence ofa third unseen object is postulated.

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Observation and Astrometry data

Constellation:Ανδρομέδα
Right ascension:23h11m39.59s
Declination:+36°47'40.7"
Apparent magnitude:8.327
Distance:6666.667 parsecs
Proper motion RA:0
Proper motion Dec:-26.1
B-T magnitude:9.585
V-T magnitude:8.431

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 218934
TYCHO-2 2000TYC 2763-313-1
USNO-A2.0USNO-A2 1200-19748469
HIPHIP 114514

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