Epsilon Mensae

Epsilon Mensae is a single star about 454 light years away in the faint constellation Mensa. It has an apparent magnitude of 5.5, making it visible with the naked eye under good skies. With a radial velocity of 10.82 km/s, it is drifting away from the Solar System, and is currently located 454 light years away based on parallax.

ε Mensae
Location of ε Mensae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Mensa
Right ascension 07h 25m 38.10s[1]
Declination −79° 05′ 39.1″[1]
Apparent magnitude (V) 5.52[2]
Characteristics
Spectral type K2/3 III[3]
B−V color index +1.28[2]
Astrometry
Radial velocity (Rv)+10.82±0.15[1] km/s
Proper motion (μ) RA: −29.197±0.055[1] mas/yr
Dec.: +5.181±0.056[1] mas/yr
Parallax (π)7.1874 ± 0.0449 mas[1]
Distance454 ± 3 ly
(139.1 ± 0.9 pc)
Absolute magnitude (MV)−0.24[4]
Details
Mass1.16[5] M☉
Radius23.0[6] R☉
Luminosity170[6] L☉
Surface gravity (log g)1.74[5] cgs
Temperature4,185[5] K
Metallicity [Fe/H]−0.01 dex
Rotational velocity (v sin i)1.8[7] km/s
Other designations
ε Men, HD 60816, HIP 36039, HR 2919, SAO 256415[8]
Database references
SIMBADdata

Properties

This is a K2/3 giant that has exhausted hydrogen at its core. This means that the spectrum of Epsilon Mensae is intermediate between a K2 and K3 star. It is about 1.2 times the mass of the Sun, but has expanded to 23 times the girth. It is radiating 170 times the Sun's luminosity, and has an effective temperature of 4,185 K.

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
  2. Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
  3. Houk, Nancy (1975). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 1. Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan. Bibcode:1975MSS...C01....0H.
  4. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  5. Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevič, G.; Monari, G.; Cantat-Gaudin, T.; Weiler, M.; Khan, S.; Miglio, A.; Carrillo, I.; Romero-Gómez, M.; Minchev, I.; De Jong, R. S.; Antoja, T.; Ramos, P.; Steinmetz, M.; Enke, H. (2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765.
  6. McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433.
  7. de Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762.
  8. "eps Men". SIMBAD. Centre de données astronomiques de Strasbourg.

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