Kappa Crucis (star)
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.
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 |
| Declination | −60° 22′ 34.4808″ |
| Apparent magnitude (V) | 5.98 |
| Characteristics | |
| Spectral type | B3Ia |
| U−B color index | −0.58 |
| B−V color index | +0.22 |
| Astrometry | |
| Radial velocity (Rv) | -3.5 km/s |
| Proper motion (μ) | RA: −5.046 mas/yr Dec.: −1.093 mas/yr |
| Parallax (π) | 0.4334 ± 0.0481 mas |
| Distance | approx. 7,500 ly (approx. 2,300 pc) |
| Absolute magnitude (MV) | −7.1 |
| Details | |
| Mass | 23.0 M☉ |
| Luminosity | 151,000 L☉ |
| Surface gravity (log g) | 2.25 cgs |
| Temperature | 16,300 K |
| Rotational velocity (v sin i) | 70 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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