Observation data Epoch J2000 Equinox |
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Constellation | Crux |
μ1 Crucis | |
Right ascension | 12h 54m 35.6249s[1] |
Declination | -57° 10′ 40.527″[1] |
Apparent magnitude (V) | 3.988[2] |
μ2 Crucis | |
Right ascension | 12h 54m 36.8865s[1] |
Declination | −57° 10′ 07.214″[1] |
Apparent magnitude (V) | 5.113[3] |
Characteristics | |
Spectral type | B2IV-V[2]/B5Vne[3] |
U−B color index | −0.75/−0.50[4] |
B−V color index | −0.17/−0.11[4] |
Astrometry | |
Radial velocity (Rv) | +13.9[5] km/s |
Proper motion (μ) | RA: −30.45[1] mas/yr Dec.: −13.55[1] mas/yr |
Parallax (π) | 8.64 ± 0.58[1] mas |
Distance | 380 ± 30 ly (116 ± 8 pc) |
Radial velocity (Rv) | +13[5] km/s |
Proper motion (μ) | RA: −32.35[1] mas/yr Dec.: −10.93[1] mas/yr |
Parallax (π) | 9.03 ± 0.61[1] mas |
Distance | 360 ± 20 ly (111 ± 7 pc) |
Details | |
Rotational velocity (v sin i) | −/124[6] km/s |
Other designations | |
Mu Crucis (μ Cru, μ Crucis) the 7th brightest star in the constellation Crux, or Southern Cross. It is a wide binary of spectral class B stars, each of magnitude 4.0 and 5.1. They lie about 360−380 light years away.
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