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HD 41809

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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.
Light curve of the AP star TW Columbae The uvby light curves of the Ap star TW Col are analyzed. The presenceof a small-scale dip in the curves appears to be in conflict with asimple spotted-rotator model. TW Col is the second star, after 46 Eri,for which such a phenomenon seems to be confirmed.
A second list of wide visual binaries Not Available
A second list of wide visual binaries Not Available

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:	Avci
Sað Açýklýk:	06^h07^m24.76^s
Yükselim:	+02Â°08'31.6"
Görünürdeki Parlaklýk:	8.583
Uzaklýk:	10000000 parsek
özdevim Sað Açýklýk:	5.1
özdevim Yükselim:	1.6
B-T magnitude:	8.83
V-T magnitude:	8.604

Kataloglar ve belirtme:

Özgün isimleri	(Edit)
HD 1989	HD 41809
TYCHO-2 2000	TYC 134-2469-1
USNO-A2.0	USNO-A2 0900-02332183
HIP	HIP 29020

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