Epsilon Mensae

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′ 39.0878″[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]
Distance454 ± 3 ly
(139.1 ± 0.9 pc)
Absolute magnitude (MV)−0.24[6]
Details
Mass1.15[7] M☉
Radius21.94[8] R☉
Luminosity170[9] L☉
Surface gravity (log g)1.74[7] cgs
Temperature4,657±122[8] K
Metallicity [Fe/H]−0.31[10] dex
Rotational velocity (v sin i)1.8±1.4[11] km/s
Age233[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
SIMBADdata

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]

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]

  1. ^ a b c d e f Cite error: The named reference DR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 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 Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference McDonald2017 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Eggen1989 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference DeMed2014 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).