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TYC 3215-1180-1


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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.

Period variations of SW Lacertae
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Observation and Astrometry data

Constellation:とかげ座
Right ascension:22h54m05.83s
Declination:+38°12'31.6"
Apparent magnitude:8.972
Proper motion RA:10.5
Proper motion Dec:-9.6
B-T magnitude:10.799
V-T magnitude:9.123

Catalogs and designations:
Proper Names
TYCHO-2 2000TYC 3215-1180-1
USNO-A2.0USNO-A2 1275-17987304
HIPHIP 113082

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