Mu Crucis

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Mu Crucis
Observation data
Epoch J2000      Equinox
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]
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]
μ1 Cru
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)
Absolute magnitude (MV) −1.49[6]
μ2 Cru
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)
Absolute magnitude (MV) −0.40[6]
μ1 Cru
Luminosity 1,123[6] L
Metallicity [Fe/H] −0.21[6] dex
μ2 Cru
Luminosity 205[6] L
Rotational velocity (v sin i) 124[7] km/s
Other designations
μ Cru, HR 4898, CD-56 4689, HD 112092/112091, SAO 240366/240367, HIP 63003/63005.[3]
Database references
μ1 Cru
μ2 Cru

Mu Crucis, Latinized from μ Crucis, is the seventh-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 to 380 light-years away.


  1. ^ a b c d e f g h i j Perryman, M. A. C.; et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics. 323: L49–L52. Bibcode:1997A&A...323L..49P. 
  2. ^ a b "HR 4898". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-06-08. 
  3. ^ a b c "HIP 63005". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-06-08. 
  4. ^ a b Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99). Bibcode:1966CoLPL...4...99J. 
  5. ^ a b Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". In Batten, Alan Henry; Heard, John Frederick. Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30. University of Toronto: International Astronomical Union. Bibcode:1967IAUS...30...57E. 
  6. ^ a b c d e Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971Freely accessible, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015. 
  7. ^ Uesugi, Akira; Fukuda, Ichiro (1970). "Catalogue of rotational velocities of the stars". Contributions from the Institute of Astrophysics and Kwasan Observatory. University of Kyoto.