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HD 192434


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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.

SANTIAGO 91, a right ascension catalogue of 3387 stars (equinox J2000).
The positions in right ascension of 3387 stars belonging to the Santiago67 Catalogue, observed with the Repsold Meridian Circle at Cerro Calan,National Astronomical Observatory, during the period 1989 to 1994, aregiven. The average mean square error of a position, for the wholeCatalogue, is +/-0.009 s. The mean epoch of the catalogue is 1991.84.

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观测天体数据

星座:人馬座
右阿森松:20h15m52.98s
赤纬:-30°41'15.1"
视星:8.928
距离:1785.714 天文距离
右阿森松适当运动:-4.8
赤纬适当运动:-1.2
B-T magnitude:11.289
V-T magnitude:9.123

目录:
适当名称   (Edit)
HD 1989HD 192434
TYCHO-2 2000TYC 7442-1561-1
USNO-A2.0USNO-A2 0525-42213661
HIPHIP 99881

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