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HD 47784


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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.

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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Observation and Astrometry data

Constellation:おおいぬ座
Right ascension:06h39m28.97s
Declination:-21°47'08.5"
Apparent magnitude:8.367
Distance:275.482 parsecs
Proper motion RA:-4.2
Proper motion Dec:1.1
B-T magnitude:8.4
V-T magnitude:8.37

Catalogs and designations:
Proper Names
HD 1989HD 47784
TYCHO-2 2000TYC 5960-93-1
USNO-A2.0USNO-A2 0675-03584910
HIPHIP 31844

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