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HD 221813


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관련 글

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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관측 및 측정 데이터

별자리:페가수스자리
적경:23h35m10.89s
적위:+12°39'43.2"
가시등급:6.952
거리:201.613 파섹
적경상의 고유운동:-12.6
적위상의 고유운동:-48.3
B-T magnitude:7.064
V-T magnitude:6.962

천체목록:
일반명   (Edit)
HD 1989HD 221813
TYCHO-2 2000TYC 1175-1541-1
USNO-A2.0USNO-A2 0975-21322295
HIPHIP 116396

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