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HD 57218


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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

Walraven photometry of nearby southern OB associations
Homogeneous Walraven (VBLUW) photometry is presented for 5260 stars inthe regions of five nearby southern OB associations: Scorpio Centaurus(Sco OB2), Orion OB1, Canis Major OB1, Monoceros OB1, and Scutum OB2.Derived V and (B - V) in the Johnson system are included.

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观测天体数据

星座:大犬座
右阿森松:07h18m53.51s
赤纬:-32°00'30.4"
视星:9.36
右阿森松适当运动:-10.7
赤纬适当运动:7.5
B-T magnitude:9.299
V-T magnitude:9.355

目录:
适当名称   (Edit)
HD 1989HD 57218
TYCHO-2 2000TYC 7107-1530-1
USNO-A2.0USNO-A2 0525-04656567
HIPHIP 35432

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