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HD 207121


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New periodic variables from the Hipparcos epoch photometry
Two selection statistics are used to extract new candidate periodicvariables from the epoch photometry of the Hipparcos catalogue. Theprimary selection criterion is a signal-to-noise ratio. The dependenceof this statistic on the number of observations is calibrated usingabout 30000 randomly permuted Hipparcos data sets. A significance levelof 0.1 per cent is used to extract a first batch of candidate variables.The second criterion requires that the optimal frequency be unaffectedif the data are de-trended by low-order polynomials. We find 2675 newcandidate periodic variables, of which the majority (2082) are from theHipparcos`unsolved' variables. Potential problems with theinterpretation of the data (e.g. aliasing) are discussed.

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Observation and Astrometry data

Constellation:Pegasus
Right ascension:21h46m16.81s
Declination:+25°56'04.8"
Apparent magnitude:7.803
Distance:591.716 parsecs
Proper motion RA:-4.6
Proper motion Dec:-11.6
B-T magnitude:9.905
V-T magnitude:7.977

Catalogs and designations:
Proper Names
HD 1989HD 207121
TYCHO-2 2000TYC 2206-44-1
USNO-A2.0USNO-A2 1125-18762076
HIPHIP 107489

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