Epsilon Muscae

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Epsilon Muscae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Musca
Right ascension 12h 17m 34.27716s[1]
Declination −67° 57′ 38.6″[1]
Apparent magnitude (V) 4.06v
Spectral type M5 III[2]
Radial velocity (Rv) 7.10 ± 0.7 km/s
Proper motion (μ) RA: –231.04 ± 0.13[1] mas/yr
Dec.: –26.39 ± 0.13[1] mas/yr
Parallax (π) 10.82 ± 0.17[1] mas
Distance 301 ± 5 ly
(92 ± 1 pc)
Other designations
eps Mus, CPD-67 1931, HD 106849, HIP 59929, HR 4671, SAO 251830.
Database references

Epsilon Muscae (ε Mus) is a red giant star of spectral type M5III in the constellation Musca.[2] Originally a main-sequence star of around 1.5 to 2 solar masses, it has now expanded to 130 times the Sun's diameter and 1800 to 2300 its luminosity.[3] It is a semiregular variable, varying in eight distinct periods ranging from a month to over half a year in length, with the largest amplitude being of almost half a magnitude from the mean of 4.06.[2] It is located around 300 light-years distant,[1] the same distance as the Lower Centaurus Crux subgroup of the Scorpius–Centaurus Association, although it is moving much faster at around 100 km/s and does not share a common origin.[3]


  1. ^ a b c d e f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752free to read, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357 
  2. ^ a b c Tabur, V.; Bedding, T. R.; Kiss, L. L.; Moon, T. T.; Szeidl, B.; Kjeldsen, H. (2009). "Long-term photometry and periods for 261 nearby pulsating M giants". Monthly Notices of the Royal Astronomical Society. 400 (4): 1945–1961. arXiv:0908.3228free to read. Bibcode:2009MNRAS.400.1945T. doi:10.1111/j.1365-2966.2009.15588.x. 
  3. ^ a b Kaler, Jim. "Epsilon Muscae". Stars. University of Illinois. Retrieved 21 December 2013.