Mu Crucis

Mu Crucis

Observation data Epoch J2000      Equinox
Constellation	Crux
μ^1 Crucis
Right ascension	12^h 54^m 35.6249^s[1]
Declination	−57° 10′ 40.527″[1]
Apparent magnitude (V)	3.988[2]
μ^2 Crucis
Right ascension	12^h 54^m 36.8865^s[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
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. Perryman, M. A. C.; et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics 323: L49–L52. Bibcode:1997A&A...323L..49P.
2. "HR 4898 -- Variable Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-06-08.
3. "HIP 63005 -- Be Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-06-08.
4. 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. 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. 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.