CD Crucis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Crux |
| Right ascension | 12h 43m 50.99768s |
| Declination | −63° 05′ 14.8029″ |
| Apparent magnitude (V) | 10.81 (10.71 - 10.82) |
| Characteristics | |
| Spectral type | WN6o + O5V |
| U−B color index | −0.19 |
| B−V color index | +0.83 |
| Variable type | Eclipsing binary |
| Astrometry | |
| Radial velocity (Rv) | 8.00 km/s |
| Proper motion (μ) | RA: −5.921±0.052 mas/yr Dec.: −0.409±0.047 mas/yr |
| Parallax (π) | 0.2336±0.0382 mas |
| Distance | approx. 14,000 ly (approx. 4,300 pc) |
| Absolute magnitude (MV) | −6.2 (−5.2 + −5.7) |
| Orbit | |
| Primary | WR |
| Companion | O |
| Period (P) | 6.23930 days |
| Semi-major axis (a) | 0.3010" (68 R☉) |
| Eccentricity (e) | 0 |
| Inclination (i) | 67 ± 3° |
| Longitude of the node (Ω) | 3.10° |
| Semi-amplitude (K1) (primary) | 263 ± 4 km/s |
| Semi-amplitude (K2) (secondary) | 218 ± 9 km/s |
| Details | |
| WR | |
| Mass | 42.6 ± 3.6 M☉ |
| Radius | 5 R☉ |
| Luminosity | 127,000 L☉ |
| O | |
| Mass | 51.0 ± 2.8 M☉ |
| Radius | 12 R☉ |
| Luminosity | 880,000 L☉ |
| Other designations | |
| CD Crucis, HIP 62115, HD 311884, WR 47, 2MASS J12435102-6305148, AAVSO 1238-62 | |
| Database references | |
| SIMBAD | data |
CD Crucis, also known as HD 311884, is an eclipsing binary star system in the constellation Crux. It is around 14,000 light years away near the faint open cluster Hogg 15. The binary contains a Wolf–Rayet star and is also known as WR 47.