Mu Crucis

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]
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
Distance380 ± 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
Distance360 ± 20 ly
(111 ± 7 pc)
Details
Rotational velocity (v sin i)−/124[6] km/s
Other designations
HR 4898, CD-56 4689, HD 112092/112091, SAO 240366/240367, HIP 63003/63005.[3]

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.

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 Perryman, M. A. C. et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics 323: L49–L52. Bibcode:1997A&A...323L..49P.
  2. ↑ 2.0 2.1 "HR 4898 -- Variable Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-06-08.
  3. ↑ 3.0 3.1 3.2 "HIP 63005 -- Be Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-06-08.
  4. ↑ 4.0 4.1 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. ↑ 5.0 5.1 Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". In Batten, Alan Henry. Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30. University of Toronto: International Astronomical Union. Retrieved 2009-09-10.
  6. ↑ Uesugi, Akira; Fukuda, Ichiro (1970). "Catalogue of rotational velocities of the stars". Contributions from the Institute of Astrophysics and Kwasan Observatory (University of Kyoto). Bibcode:1970crvs.book.....U.