Beta Mensae

Beta Mensae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Mensa
Right ascension 05h 02m 42.99714s[1]
Declination −71° 18′ 51.4842″[1]
Apparent magnitude (V) 5.31[2]
Characteristics
Spectral type G8 III[3]
U−B color index +0.77[2]
B−V color index +1.00[2]
Astrometry
Radial velocity (Rv)−11.40[4] km/s
Proper motion (μ) RA: −3.54[1] mas/yr
Dec.: +10.68[1] mas/yr
Parallax (π)4.11 ± 0.22[1] mas
Distance790 ± 40 ly
(240 ± 10 pc)
Absolute magnitude (MV)−1.62[5]
Details
Mass3.58[4] M☉
Luminosity513[4] L☉
Surface gravity (log g)2.54±0.11[6] cgs
Temperature5,088±44[6] K
Metallicity [Fe/H]+0.00±0.04[6] dex
Age270[4] Myr
Other designations
β Men, CPD−71° 309, FK5 2380, GC 6232, HD 33285, HIP 23467, HR 1677, SAO 256154, PPM 368632[7]
Database references
SIMBADdata

Beta Mensae, Latinized from β Mensae, is the third-brightest star in the constellation of Mensa. Despite this, it is only dimly visible to the naked eye, having an apparent visual magnitude of 5.31.[2] Based upon an annual parallax shift of just 4.11 mas as seen from the Earth,[1] it is roughly 790 light years from the Sun. This is a solitary,[8] yellow-hued G-type giant star with a stellar classification of G8 III.[3] It is around 270 million years old with 3.6 times the mass of the Sun.[4] Beta Mensae is radiating 513[4] times the Sun's luminosity from its photosphere at an effective temperature of about 5,088 K.[6]

References

  1. 1 2 3 4 5 6 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. 1 2 3 4 Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. 1 2 Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  4. 1 2 3 4 5 6 Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 23, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, 88.
  5. ↑ 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.
  6. 1 2 3 4 Alves, S.; et al. (April 2015), "Determination of the spectroscopic stellar parameters for 257 field giant stars", Monthly Notices of the Royal Astronomical Society, 448 (3): 2749–2765, arXiv:1503.02556, Bibcode:2015MNRAS.448.2749A, doi:10.1093/mnras/stv189.
  7. ↑ "bet Men". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-16.
  8. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.


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