Epsilon Mensae
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Mensa |
| Right ascension | 07h 25m 38.0987s |
| Declination | −79° 05′ 39.088″ |
| Apparent magnitude (V) | 5.52±0.01 |
| Characteristics | |
| Spectral type | K2/3 III |
| U−B color index | +1.42 |
| B−V color index | +1.28 |
| Astrometry | |
| Radial velocity (Rv) | 10.5±2.9 km/s |
| Proper motion (μ) | RA: −29.197 mas/yr Dec.: +5.181 mas/yr |
| Parallax (π) | 7.1874±0.0449 mas |
| Distance | 454 ± 3 ly (139.1 ± 0.9 pc) |
| Absolute magnitude (MV) | −0.24 |
| Details | |
| Mass | 1.15 M☉ |
| Radius | 21.94 R☉ |
| Luminosity | 170 L☉ |
| Surface gravity (log g) | 1.74 cgs |
| Temperature | 4,657±122 K |
| Metallicity [Fe/H] | −0.31 dex |
| Rotational velocity (v sin i) | 1.8±1.4 km/s |
| Age | 233 Myr |
| Other designations | |
| ε Men, 43 G. Mensae, CPD−78°265, FK5 2583, GC 10055, HD 60816, HIP 36039, HR 2919, SAO 256415 | |
| Database references | |
| SIMBAD | data |
Epsilon Mensae, Latinized to ε Mensae, is a single star in the southern circumpolar constellation Mensa. It has an apparent magnitude of 5.52, making it faintly visible to the naked eye under ideal conditions. The object has a heliocentric radial velocity of 10.5 km/s, meaning it is receding from the Solar System, and is estimated to be 454 light years away.
Epsilon Mensae has a stellar classification of K2/3 III — intermediate between a K2 and K3 giant star. It has 115% the mass of the Sun and an enlarged radius of 21.9 R☉. It shines at 170 times the luminosity of the Sun from its photosphere at an effective temperature of 4,657 K, giving it an orange glow. Epsilon Mensae has a metallicity 49% that of the Sun and is believed to be a member of the young disk population. It spins leisurely with a projected rotational velocity of about 1.8 km/s.