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HD 54787


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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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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Buyuk Kopek
Sað Açýklýk:07h09m21.15s
Yükselim:-22°29'35.1"
Görünürdeki Parlaklýk:9.067
özdevim Sað Açýklýk:-1.8
özdevim Yükselim:4.4
B-T magnitude:9.02
V-T magnitude:9.064

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 54787
TYCHO-2 2000TYC 5976-74-1
USNO-A2.0USNO-A2 0675-05022686
HIPHIP 34537

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