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HD 51286


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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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观测天体数据

星座:大犬座
右阿森松:06h55m43.45s
赤纬:-25°11'32.4"
视星:10.015
右阿森松适当运动:-5.7
赤纬适当运动:2.4
B-T magnitude:9.976
V-T magnitude:10.012

目录:
适当名称   (Edit)
HD 1989HD 51286
TYCHO-2 2000TYC 6526-1120-1
USNO-A2.0USNO-A2 0600-04379426
HIPHIP 33311

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