HR 4729
HR 4729 (HD 108250) is a multiple star system located about 95 parsecs (310 ly) from the Sun in the constellation of Crux and part of the asterism known as the Southern Cross. It is a close companion of α Crucis and sometimes called α Crucis C.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Crux |
| Right ascension | 12h 26m 30.8790s |
| Declination | −63° 07′ 19.993″ |
| Apparent magnitude (V) | 4.79 |
| Characteristics | |
| Spectral type | B5 V |
| U−B color index | −0.59 |
| B−V color index | −0.12 |
| Astrometry | |
| Radial velocity (Rv) | +27 km/s |
| Proper motion (μ) | RA: −39.593 mas/yr Dec.: −14.537 mas/yr |
| Parallax (π) | 10.5623 ± 0.2340 mas |
| Distance | 309 ± 7 ly (95 ± 2 pc) |
| Absolute magnitude (MV) | −0.98 |
| Orbit | |
| Period (P) | 1.225155±0.000005 d |
| Eccentricity (e) | 0.024±0.014 |
| Periastron epoch (T) | 2438903.314±0.003 JD |
| Argument of periastron (ω) (secondary) | 314±34° |
| Semi-amplitude (K1) (primary) | 43.1±0.6 km/s |
| Details | |
| Mass | 9.65 M☉ |
| Radius | 5.5 R☉ |
| Rotational velocity (v sin i) | 131 km/s |
| Age | 12 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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