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TYC 1722-498-1


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Photoelectric Minima of Some Eclipsing Binary Stars
We present 25 minima times of 12 eclipsing binaries.

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.

The variable star U Pegasi.
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Observation and Astrometry data

Constellation:Pegasus
Right ascension:23h58m52.51s
Declination:+15°50'13.1"
Apparent magnitude:8.983
Proper motion RA:-2.9
Proper motion Dec:-9.5
B-T magnitude:10.224
V-T magnitude:9.086

Catalogs and designations:
Proper Names
TYCHO-2 2000TYC 1722-498-1
USNO-A2.0USNO-A2 1050-20859282
HIPHIP 118229
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