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HD 193856


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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.

The Distribution of the BD M-Type Stars Along the Galactic Equator.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1958ApJ...128..510N&db_key=AST

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观测天体数据

星座:天鵝座
右阿森松:20h21m24.24s
赤纬:+30°51'51.3"
视星:7.65
距离:806.452 天文距离
右阿森松适当运动:-6.4
赤纬适当运动:-10
B-T magnitude:9.787
V-T magnitude:7.827

目录:
适当名称   (Edit)
HD 1989HD 193856
TYCHO-2 2000TYC 2672-611-1
USNO-A2.0USNO-A2 1200-14964221
HIPHIP 100377

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