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HD 44720


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Open clusters with Hipparcos. I. Mean astrometric parameters
New memberships, mean parallaxes and proper motions of all 9 openclusters closer than 300 pc (except the Hyades) and 9rich clusters between 300 and 500 pc have been computed using Hipparcosdata. Precisions, ranging from 0.2 to 0.5 mas for parallaxes and 0.1 to0.5 mas/yr for proper motions, are of great interest for calibratingphotometric parallaxes as well as for kinematical studies. Carefulinvestigations of possible biases have been performed and no evidence ofsignificant systematic errors on the mean cluster parallaxes has beenfound. The distances and proper motions of 32 more distant clusters,which may be used statistically, are also indicated. Based onobservations made with the ESA Hipparcos astrometry satellite

Photoelectric observations of the eclipsing variable IM Monocerotis
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观测天体数据

星座:麒麟座
右阿森松:06h23m06.11s
赤纬:-03°30'56.8"
视星:7.181
距离:636.943 天文距离
右阿森松适当运动:-5.8
赤纬适当运动:-1.8
B-T magnitude:7.046
V-T magnitude:7.17

目录:
适当名称   (Edit)
HD 1989HD 44720
TYCHO-2 2000TYC 4789-3299-1
USNO-A2.0USNO-A2 0825-02338706
HIPHIP 30356

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