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HD 54148


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The region of Collinder 121
The distribution of bright B-type stars in a field with a radius of5° centred at the Galactic open cluster Cr 121 is studied utilizingStrömgren and Hβ photometry. All PPM stars earlier thanspectral type A0 are used, revealing a loose nearby structure at adistance of 660-730pc, and a compact more distant group, which appearsto be a genuine cluster: Cr 121. Based on similar coordinates, distancesand positions on the colour-magnitude (CM) and Hertzsprung-Russell (HR)diagrams, 11 photometric cluster members are selected at a mean distanceof 1085(+/-41 standard error) pc. The results are discussed in the lightof both classical and Hipparcos points of view.

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Observation and Astrometry data

Constellation:おおいぬ座
Right ascension:07h06m50.89s
Declination:-24°22'48.9"
Apparent magnitude:9.887
Proper motion RA:0.8
Proper motion Dec:8.9
B-T magnitude:9.945
V-T magnitude:9.892

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 54148
TYCHO-2 2000TYC 6527-1275-1
USNO-A2.0USNO-A2 0600-04926921
HIPHIP 34314

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