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HD 173158


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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

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Observation and Astrometry data

Constellation:へび座
Right ascension:18h43m45.30s
Declination:+05°44'14.6"
Apparent magnitude:7.921
Distance:591.716 parsecs
Proper motion RA:-0.7
Proper motion Dec:-6.8
B-T magnitude:9.826
V-T magnitude:8.079

Catalogs and designations:
Proper Names
HD 1989HD 173158
TYCHO-2 2000TYC 459-1134-1
USNO-A2.0USNO-A2 0900-13541239
HIPHIP 91870

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