Mimosa (star)

Mimosa
Location of Mimosa (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Crux
Pronunciation /mɪˈmoʊsə/[1]
Right ascension 12h 47m 43.26877s[2]
Declination −59° 41′ 19.5792″[2]
Apparent magnitude (V) 1.25[3] (1.23 - 1.31)[4]
Characteristics
Evolutionary stage Main sequence[5]
Spectral type B0.5 III[6] / B2V[7]
U−B color index −0.98[3]
B−V color index −0.23[3]
Variable type β Cep[6]
Astrometry
Radial velocity (Rv)+15.6[8] km/s
Proper motion (μ) RA: −42.97[2] mas/yr
Dec.: −16.18[2] mas/yr
Parallax (π)11.71 ± 0.98 mas[2]
Distance280 ± 20 ly
(85 ± 7 pc)
Absolute magnitude (MV)−3.92[9]
Orbit[7]
Primaryβ Crucis A
Companionβ Crucis B
Period (P)1828.0±2.5 days
Semi-major axis (a)8.7 AU
Eccentricity (e)0.38±0.09
Periastron epoch (T)2,449,879±38 HJD
Argument of periastron (ω)
(secondary)		293±9°
Details
A
Mass16[6] M☉
Radius8.4±0.6[6] R☉
Luminosity34,000[6] L☉
Surface gravity (log g)3.6±0.1[6] cgs
Temperature27,000±1,000[6] K
Metallicity [Fe/H]−0.08[10] dex
Rotation3.6 days[6]
Rotational velocity (v sin i)35[6] km/s
Age8 to 11[6] Myr
B
Mass10[7] M☉
Other designations
Mimosa[1] Becrux,[11], β Crucis, CPD−59°4451, FK5 481, HD 111123, HIP 62434, HR 4853, SAO 240259[12]
Database references
SIMBADdata

Mimosa is the second-brightest object in the southern constellation of Crux (after Acrux), and the 20th-brightest star in the night sky. It has the Bayer designation β Crucis, which is Latinised to Beta Crucis and abbreviated Beta Cru or β Cru. Mimosa forms part of the prominent asterism called the Southern Cross. It is a binary star or a possible triple star system.

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