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HD 203989


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Pulkovo compilation of radial velocities for 35495 stars in a common system.
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Radial velocities. Measurements of 2800 B2-F5 stars for HIPPARCOS
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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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Datos observacionales y astrométricos

Constelación:Cisne
Ascensión Recta:21h24m05.60s
Declinación:+47°42'23.3"
Magnitud Aparente:7.996
Distancia:321.543 parsecs
Movimiento Propio en Ascensión Recta:-6.3
Movimiento Propio en Declinación:-21.5
B-T magnitude:8.014
V-T magnitude:7.998

Catálogos y designaciones:
Nombres Propios   (Edit)
HD 1989HD 203989
TYCHO-2 2000TYC 3594-2183-1
USNO-A2.0USNO-A2 1350-13989884
HIPHIP 105658

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