Gamma Muscae

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γ Muscae
Diagram showing star positions and boundaries of the Musca constellation and its surroundings
Cercle rouge 100%.svg

Location of γ Muscae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Musca
Right ascension 12h 32m 28.01343s[1]
Declination −72° 07′ 58.7597″[1]
Apparent magnitude (V) 3.84
Spectral type B5V
B−V color index −0.157
Radial velocity (Rv) 2.5 km/s
Proper motion (μ) RA: −51.34[1] mas/yr
Dec.: −5.40[1] mas/yr
Parallax (π) 10.04 ± 0.13[1] mas
Distance 325 ± 4 ly
(100 ± 1 pc)
Absolute magnitude (MV) –1.1[2]
Luminosity 790[2] L
Surface gravity (log g) 4.04[2] cgs
Temperature 16,000[2] K
Other designations
CD–70 997, FK5 487, GC 17672, HD 109026, HIP 61199, HR 4923, SAO 257000.
Database references

γ Muscae, Latinised as Gamma Muscae, is a star in the southern circumpolar constellation of Musca, the Fly. It is a blue-white star of spectral type B5V that ranges between magnitudes 3.84 and 3.86 over a period of 2.7 days. It is a variable of a different type, classed as a Slowly pulsating B star.[3] It is around five times as massive as the Sun.[4]

This star is a proper motion member of the Lower-Centaurus Crux sub-group in the Scorpius-Centaurus OB association, the nearest such association of co-moving massive stars to the Sun.[2]


  1. ^ a b c d e van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357 
  2. ^ a b c d e de Geus, E. J.; de Zeeuw, P. T.; Lub, J. (June 1989), "Physical parameters of stars in the Scorpio-Centaurus OB association", Astronomy and Astrophysics, 216 (1-2): 44–61, Bibcode:1989A&A...216...44D 
  3. ^ BSJ (5 March 2012). "Gamma Muscae". AAVSO Website. American Association of Variable Star Observers. Retrieved 21 December 2013. 
  4. ^ Molenda-Zakowicz, J.; Połubek, G. (2004). "Empirical absolute magnitudes, luminosities and effective temperatures of SPB variables and the problem of variability classification of monoperiodic stars" (PDF). Acta Astronomica. 54: 281–97 [283]. Bibcode:2004AcA....54..281M.