Epsilon Muscae
Epsilon Muscae, Latinized as ε Muscae, is a red giant star of spectral type M5III in the constellation Musca. Originally a main-sequence star of around 1.5 to 2 solar masses, it is now on the asymptotic giant branch and has now expanded to 130 times the Sun's diameter and 1800 to 2300 its luminosity. It is a semiregular variable, varying between visual magnitudes 4.0 and 4.3 in eight distinct periods ranging from a month to over half a year in length. It is located around 300 light-years distant, 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.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Musca |
| Right ascension | 12h 17m 34.27716s |
| Declination | −67° 57′ 38.6486″ |
| Apparent magnitude (V) | 4.0 - 4.3 |
| Characteristics | |
| Evolutionary stage | asymptotic giant branch |
| Spectral type | M5 III |
| Variable type | SRb |
| Astrometry | |
| Radial velocity (Rv) | 7.1±0.7 km/s |
| Proper motion (μ) | RA: −231.04±0.13 mas/yr Dec.: −26.39±0.13 mas/yr |
| Parallax (π) | 10.82 ± 0.17 mas |
| Distance | 301 ± 5 ly (92 ± 1 pc) |
| Absolute magnitude (MV) | −0.77 |
| Details | |
| Mass | <1.5-2 M☉ |
| Radius | ~130 R☉ |
| Luminosity | 1800-2300 L☉ |
| Temperature | 3400 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
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