Kappa Crucis (star)

κ Crucis

The centre of NGC 4755, with κ Cru on the left
Credit: NASA/ESA and Jesús Maíz Apellániz (Instituto de Astrofísica de Andalucía, Spain)
Observation data
Epoch J2000      Equinox J2000
Constellation Crux
Right ascension 12h 53m 48.91920s[1]
Declination −60° 22′ 34.4808″[1]
Apparent magnitude (V) 5.98[2]
Characteristics
Spectral type B3Ia[3]
U−B color index −0.58[2]
B−V color index +0.22[2]
Astrometry
Radial velocity (Rv)-3.5[4] km/s
Proper motion (μ) RA: −5.046[5] mas/yr
Dec.: −1.093[5] mas/yr
Parallax (π)0.4334 ± 0.0481 mas[5]
Distanceapprox. 7,500 ly
(approx. 2,300 pc)
Absolute magnitude (MV)−7.1[6]
Details[7]
Mass23.0 M☉
Luminosity151,000 L☉
Surface gravity (log g)2.25 cgs
Temperature16,300 K
Rotational velocity (v sin i)70 km/s
Other designations
κ Cru, CD−59°4460, HD 111973, HIP 62931, HR 4890, SAO 252077, 2MASS J12534890-6022344
Database references
SIMBADdata

Kappa Crucis (κ Cru, HD 111973) is a spectroscopic binary 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 c Cite error: The named reference dachs1984 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference aa512_L55 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Gontcharov was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference dr2 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference humphreys 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).