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HD 188304


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The nature of some doubtful open clusters as revealed by HIPPARCOS
We discuss the nature of some galactic open clusters by using propermotions and parallaxes from the Hipparcos and ACT catalogues. We showthat the clusters Collinder 399, Upgren 1, NGC 1252 and Melotte 227 donot exist. Collinder 132 is found to be mainly composed out of membersof an OB association, but there may be a star cluster present in thisarea too. Roeser & Bastian (1994) proposed that NGC 2451 consists oftwo star clusters. We show that NGC 2451 A definitively does exist, NGC2451 B may exist. A star cluster may also be present in the area ofRoslund 5. The Hipparcos data finally confirm the reality of Collinder135.

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Observation and Astrometry data

Constellation:はちぶんぎ座
Right ascension:20h03m49.72s
Declination:-78°15'46.0"
Apparent magnitude:8.383
Distance:275.482 parsecs
Proper motion RA:28.7
Proper motion Dec:8.2
B-T magnitude:9.739
V-T magnitude:8.495

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 188304
TYCHO-2 2000TYC 9464-1607-1
USNO-A2.0USNO-A2 0075-06526390
HIPHIP 98789

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