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TYC 4018-840-1

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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.
The Tokyo PMC catalog 90-93: Catalog of positions of 6649 stars observed in 1990 through 1993 with Tokyo photoelectric meridian circle The sixth annual catalog of the Tokyo Photoelectric Meridian Circle(PMC) is presented for 6649 stars which were observed at least two timesin January 1990 through March 1993. The mean positions of the starsobserved are given in the catalog at the corresponding mean epochs ofobservations of individual stars. The coordinates of the catalog arebased on the FK5 system, and referred to the equinox and equator ofJ2000.0. The mean local deviations of the observed positions from theFK5 catalog positions are constructed for the basic FK5 stars to comparewith those of the Tokyo PMC Catalog 89 and preliminary Hipparcos resultsof H30.
A spectral survey of early-type stars in the region of Cassiopeia using an objective prism Not Available
The high-luminosity boundary of the beta CEP instability strip. Abstract image available at:http://adsabs.harvard.edu/abs/1972AJ.....77..381P
Catalogue d'etoiles O et B. Not Available
Etude pour chaque champ de l'absorption et de la repartition des vitesses radiales EN fonction de la distance. Not Available

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观测天体数据

星座:	仙后座
右阿森松:	00^h03^m27.30^s
赤纬:	+62Â°21'28.1"
视星:	8.663
距离:	1234.568 天文距离
右阿森松适当运动:	-1.3
赤纬适当运动:	2.8
B-T magnitude:	8.823
V-T magnitude:	8.677

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适当名称
TYCHO-2 2000	TYC 4018-840-1
USNO-A2.0	USNO-A2 1500-00069489
HIP	HIP 279

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