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Variable star in the constellation Musca From Wikipedia, the free encyclopedia
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]
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] |
Distance | 326 ± 7 ly (100 ± 2 pc) |
Absolute magnitude (MV) | −0.77[6] |
Details | |
Mass | 2±0.3[7] M☉ |
Radius | 116±9[7] R☉ |
Luminosity | 1,738[2] L☉ |
Surface gravity (log g) | 0.6±0.02[7] cgs |
Temperature | 3,470±125[7] K |
Other designations | |
Database references | |
SIMBAD | data |
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