BP Crucis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Crux |
| Right ascension | 12h 26m 37.561s |
| Declination | −62° 46′ 13.16″ |
| Apparent magnitude (V) | 10.83 |
| Characteristics | |
| Spectral type | B1 Ia+ |
| U−B color index | +0.42 |
| B−V color index | +1.76 |
| Variable type | Ellipsoidal + X-ray |
| Astrometry | |
| Parallax (π) | 0.34±0.75 mas |
| Distance | 3,040 pc |
| Absolute magnitude (MV) | −7.47 |
| Orbit | |
| Period (P) | 41.498 days |
| Semi-major axis (a) | 0.00029" (191.7 R☉) |
| Eccentricity (e) | 0.462 |
| Inclination (i) | 60° |
| Details | |
| Mass | 43 M☉ |
| Radius | 70 R☉ |
| Luminosity (bolometric) | 470,000 L☉ |
| Surface gravity (log g) | 2.38 cgs |
| Temperature | 18,100 K |
| Rotational velocity (v sin i) | 55 km/s |
| Other designations | |
| BP Cru, Hen 3-788, Wray 15-977, 2MASS J12263756-6246132, GX 301-2, AAVSO 1221-62 | |
| Database references | |
| SIMBAD | data |
BP Crucis (x-ray source GX 301-2) is an X-ray binary system containing a blue hypergiant and a pulsar.