Epsilon Mensae

Epsilon Mensae, Latinized to ε Mensae, is a single^[14] star in the southern circumpolar constellation Mensa. It has an apparent magnitude of 5.52,^[2] making it faintly visible to the naked eye under ideal conditions. The object has a heliocentric radial velocity of 10.5 km/s,^[5] meaning it is receding from the Solar System, and is estimated to be 454 light years away.^[1]

ε Mensae

Location of ε Mensae (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Mensa
Right ascension	07h 25m 38.0987s[1]
Declination	−79° 05′ 39.088″[1]
Apparent magnitude (V)	5.52±0.01[2]
Characteristics
Spectral type	K2/3 III[3]
U−B color index	+1.42[4]
B−V color index	+1.28[4]
Astrometry
Radial velocity (Rv)	10.5±2.9[5] km/s
Proper motion (μ)	RA: −29.197 mas/yr[1] Dec.: +5.181 mas/yr[1]
Parallax (π)	7.1874±0.0449 mas[1]
Distance	454 ± 3 ly (139.1 ± 0.9 pc)
Absolute magnitude (MV)	−0.24[6]
Details
Mass	1.15[7] M☉
Radius	21.94[8] R☉
Luminosity	170[9] L☉
Surface gravity (log g)	1.74[7] cgs
Temperature	4,657±122[8] K
Metallicity [Fe/H]	−0.31[10] dex
Rotational velocity (v sin i)	1.8±1.4[11] km/s
Age	233[1] Myr
Other designations
ε Men, 43 G. Mensae, CPD−78°265, FK5 2583, GC 10055, HD 60816, HIP 36039, HR 2919, SAO 256415[12][13]
Database references
SIMBAD	data

Epsilon Mensae has a stellar classification of K2/3 III — intermediate between a K2 and K3 giant star.^[3] It has 115% the mass of the Sun^[7] and an enlarged radius of 21.9 R_☉. It shines at 170 times the luminosity of the Sun^[9] from its photosphere at an effective temperature of 4,657 K,^[8] 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.^[10] It spins leisurely with a projected rotational velocity of about 1.8 km/s.^[11]