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BU Crucis
Star
BU Crucis is a variable star in the open cluster NGC 4755, which is also known as the Kappa Crucis Cluster or Jewel Box Cluster. Wikipedia
Absolute magnitude (MV): −7.00
Apparent magnitude (V): 6.80 - 6.90
B−V color index: +0.20
Luminosity: 275,000 L☉
Radial velocity (Rv): −17.00 km/s
U−B color index: −0.67