Epsilon Muscae

Epsilon Muscae

A light curve for Epsilon Muscae, plotted from Hipparcos data[1]
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Musca
Right ascension 12h 17m 34.27564s[2]
Declination −67° 57′ 38.65252″[2]
Apparent magnitude (V) 4.0 – 4.3[3]
Characteristics
Evolutionary stage asymptotic giant branch[4]
Spectral type M5 III[5]
Variable type SRb[3]
Astrometry
Radial velocity (Rv)7.1±0.7[citation needed] km/s
Proper motion (μ) RA: −230.607±0.187 mas/yr[2]
Dec.: −26.206±0.263 mas/yr[2]
Parallax (π)9.9915 ± 0.2 mas[2]
Distance326 ± 7 ly
(100 ± 2 pc)
Absolute magnitude (MV)−0.77[6]
Details
Mass2±0.3[7] M☉
Radius116±9[7] R☉
Luminosity1,738[2] L☉
Surface gravity (log g)0.6±0.02[7] cgs
Temperature3,470±125[7] K
Other designations
eps Mus, CPD−67 1931, HD 106849, HIP 59929, HR 4671, SAO 251830
Database references
SIMBADdata

Epsilon Muscae, Latinized as ε Muscae, is a red giant star of spectral type M5III in the constellation Musca.[5] Originally a main-sequence star of around 2 solar masses,[7] it is now on the asymptotic giant branch[4] and has now expanded to 117 times the Sun's diameter and 1,700 its luminosity.[7] It is a semiregular variable, varying between visual magnitudes 4.0 and 4.3[3] in eight distinct periods ranging from a month to over half a year in length.[5] It is located around 326 light-years distant,[2] 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.[8]

  1. ^ Cite error: The named reference CDS was invoked but never defined (see the help page).
  2. ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. ^ a b c Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 255195566.
  4. ^ a b Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal, 104 (1): 275–313, Bibcode:1992AJ....104..275E, doi:10.1086/116239.
  5. ^ a b c Cite error: The named reference TaburBedding2009 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d e f Cite error: The named reference kallinger was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference kalereps was invoked but never defined (see the help page).