Gamma Muscae

Gamma Muscae

Location of γ Muscae (circled)
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Musca
Right ascension	12^h 32^m 28.01343^s[1]
Declination	−72° 07′ 58.7597″[1]
Apparent magnitude (V)	3.84
Characteristics
Spectral type	B5V
B−V color index	−0.157
Astrometry
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]
Details
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
SIMBAD	data

Gamma Muscae is a star in the southern circumpolar constellation of Musca, or 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 our 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]

References

1. van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357
2. 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.