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BU Crucis
Star in the constellation Crux / From Wikipedia, the free encyclopedia
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BU Crucis (HD 111934) is a variable star in the open cluster NGC 4755, which is also known as the Kappa Crucis Cluster or Jewel Box Cluster.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Crux |
Right ascension | 12h 53m 37.62181s[1] |
Declination | −60° 21′ 25.3912″[1] |
Apparent magnitude (V) | 6.80 - 6.90[2] |
Characteristics | |
Spectral type | B2 Ia[3] |
U−B color index | −0.67[4] |
B−V color index | +0.20[4] |
Variable type | Eclipsing?[2] |
Astrometry | |
Radial velocity (Rv) | −17.00[5] km/s |
Proper motion (μ) | RA: −4.643[6] mas/yr Dec.: −1.050[6] mas/yr |
Parallax (π) | 0.4441 ± 0.0330 mas[6] |
Distance | 7,300 ± 500 ly (2,300 ± 200 pc) |
Absolute magnitude (MV) | −7.00[3] |
Details | |
Mass | 29.2[3] M☉ |
Radius | 41.6[3] R☉ |
Luminosity | 275,000[3] L☉ |
Surface gravity (log g) | 2.65[3] cgs |
Temperature | 20,600[3] K |
Rotational velocity (v sin i) | 75[7] km/s |
Age | 5.6[3] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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