Mu Muscae

Mu Muscae, Latinized from μ Muscae, is a solitary^[8] star in the southern constellation of Musca. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of around 4.75.^[4] Based upon an annual parallax shift of 7.21 mas as seen from Earth, it is located about 450 light years from the Sun. The star is drifting further away with a radial velocity of +37 km/s.^[5]

Mu Muscae

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Musca
Right ascension	11h 48m 14.53282s[1]
Declination	−66° 48′ 53.6712″[1]
Apparent magnitude (V)	4.6 - 4.8[2]
Characteristics
Spectral type	K4 III[3]
U−B color index	+1.89[4]
B−V color index	+1.54[4]
Variable type	Lb[2]
Astrometry
Radial velocity (Rv)	+37.4±2.8[5] km/s
Proper motion (μ)	RA: −31.223[1] mas/yr Dec.: −15.938[1] mas/yr
Parallax (π)	7.2113±0.1762 mas[1]
Distance	450 ± 10 ly (139 ± 3 pc)
Absolute magnitude (MV)	−0.85[6]
Details
Radius	52.92+1.01 −0.95[1] R☉
Luminosity	602.0±16.9[1] L☉
Temperature	3,930+36 −37[1] K
Other designations
μ Mus, CD−66°1114, HD 102584, HIP 57581, HR 4530, SAO 251597[7]
Database references
SIMBAD	data

This is an evolved K-type giant star with a stellar classification of K4 III,^[3] having exhausted the supply of hydrogen at its core then cooled and expanded to 53^[1] times the Sun's radius. It most likely on the red giant branch, rather than the asymptotic giant branch, and shows no signs of mass loss. Mu Muscae is a type Lb, oxygen-rich irregular variable with a small amplitude^[9] that ranges in visual magnitude between 4.71 and 4.76.^[10] It is radiating 602 times the luminosity of the Sun from its photosphere at an effective temperature of 3,930 K.^[1]