BU Crucis

BU Crucis

The star cluster NGC 4755. BU Crucis is the bright blue star just above and to the right of the centre.
Credit: ESO/Y. Beletsky
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]
Distance7,300 ± 500 ly
(2,300 ± 200 pc)
Absolute magnitude (MV)−7.00[3]
Details
Mass29.2[3] M☉
Radius41.6[3] R☉
Luminosity275,000[3] L☉
Surface gravity (log g)2.65[3] cgs
Temperature20,600[3] K
Rotational velocity (v sin i)75[7] km/s
Age5.6[3] Myr
Other designations
BU Cru, CD−59°4458, HD 111934, HIP 62913, 2MASS J12533761-6021254
Database references
SIMBADdata

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.

  1. ^ a b Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference gcvs was invoked but never defined (see the help page).
  3. ^ a b c d e f g h Cite error: The named reference aidelman was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference dachs1984 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference ascc was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference dr2 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference vltf was invoked but never defined (see the help page).