HR 4887
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Crux |
| Right ascension | 12h 53m 21.89463s |
| Declination | −60° 19′ 46.5630″ |
| Apparent magnitude (V) | 5.77 |
| Characteristics | |
| Spectral type | B9 Ia |
| U−B color index | −0.34 |
| B−V color index | +0.32 |
| Variable type | α Cyg? |
| Astrometry | |
| Radial velocity (Rv) | −19.00 km/s |
| Proper motion (μ) | RA: −4.299 mas/yr Dec.: −1.101 mas/yr |
| Parallax (π) | 0.3569±0.0729 mas |
| Distance | approx. 9,000 ly (approx. 2,800 pc) |
| Absolute magnitude (MV) | −7.00 |
| Details | |
| Mass | 18.9 M☉ |
| Radius | 69.9 R☉ |
| Luminosity | 112,000 L☉ |
| Surface gravity (log g) | 2.02 cgs |
| Temperature | 12,680 K |
| Rotational velocity (v sin i) | 70 km/s |
| Age | 8.1 Myr |
| Other designations | |
| HR 4887, CD−59°4455, HD 111904, HIP 62894, 2MASS J12532189-6019424, NSV 6008 | |
| Database references | |
| SIMBAD | data |
HR 4887 (HD 111904) is a suspected variable star in the open cluster NGC 4755, which is also known as the Kappa Crucis Cluster or Jewel Box Cluster.