HR 4729

HR 4729
Observation data
Epoch J2000      Equinox J2000
Constellation Crux
Right ascension 12h 26m 30.8790s[1]
Declination −63° 07′ 19.993″[1]
Apparent magnitude (V) 4.79[2]
Characteristics
Spectral type B5 V[3]
U−B color index −0.59[4]
B−V color index −0.12[4]
Astrometry
Radial velocity (Rv)+27[5] km/s
Proper motion (μ) RA: −39.593[6] mas/yr
Dec.: −14.537[6] mas/yr
Parallax (π)10.5623 ± 0.2340 mas[6]
Distance309 ± 7 ly
(95 ± 2 pc)
Absolute magnitude (MV)−0.98[2]
Orbit[7]
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
Mass9.65[8] M☉
Radius5.5[9] R☉
Rotational velocity (v sin i)131[10] km/s
Age12[11] Myr
Other designations
HR 4729, CPD−62°2742, GC 16951, 25 G. Crucis, WDS J12266-6306C, CCDM J12266-6306C
Database references
SIMBADdata

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.

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