Mu Muscae

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Mu Muscae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Musca
Right ascension 11h 48m 14.53576s[1]
Declination −66° 48′ 53.6688″[1]
Apparent magnitude (V) 4.75[2]
Spectral type K4 III[3]
U−B color index +1.89[2]
B−V color index +1.54[2]
Radial velocity (Rv) +37.4±2.8[4] km/s
Proper motion (μ) RA: −21.37[1] mas/yr
Dec.: −29.98[1] mas/yr
Parallax (π) 8.97 ± 0.27[1] mas
Distance 360 ± 10 ly
(111 ± 3 pc)
Luminosity 465[5] L
Temperature 4,086[5] K
Other designations
μ Mus, CD−66° 1114, HD 102584, HIP 57581, HR 4530, SAO 251597.[6]
Database references

Mu Muscae (μ Mus) is a solitary[7] star in the southern constellation of Musca. It is visible to the naked eye with an apparent visual magnitude of around 4.75.[2] Based upon an annual parallax shift of 8.97 mas as seen from Earth, it is located about 360 light years from the Sun.

This is an evolved K-type giant star with a stellar classification of K4 III.[3] It most likely on the red giant branch, rather than the asymptotic giant branch, and shows no signs of mass loss. Mu Muscae is an oxygen-rich irregular variable with a small amplitude[8] that varies in visual magnitude between 4.71 and 4.76.[9] It is radiating 465 times the luminosity of the Sun from its photosphere at an effective temperature of 4,086 K.[5]


  1. ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data, SIMBAD, Bibcode:1986EgUBV........0M. 
  3. ^ a b Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, 
  4. ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048Freely accessible, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61. 
  5. ^ a b c McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037Freely accessible, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x. 
  6. ^ "mu. Mus -- Long-period variable star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-03-14. 
  7. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878Freely accessible, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x. 
  8. ^ Kerschbaum, F. (November 1999), "Irregular variables of type Lb. Energy distributions and stellar parameters", Astronomy and Astrophysics, 351: 627−634, Bibcode:1999A&A...351..627K. 
  9. ^ BSJ (October 31, 2011), "Mu Muscae", AAVSO Website, American Association of Variable Star Observers, retrieved 2017-03-15.