Alpha Mensae

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Alpha Mensae
Stellar characteristics
Right ascension (Epoch J2000)06h 10m 14.47s
Declination (Epoch J2000)-74° 45' 10.96"
Spectral typeG5-6 V
Distance from Sol33.1 ± 0.02 ly
Other designationsAlp Men, Alf Men, HR 2261, Gl 231, Hip 29271, HD 43834, CP(D)-74 374, SAO 256274, FK5 239, LTT 2490
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Alpha Mensae is a yellow-orange main sequence dwarf star of spectral and luminosity type G5-6 V, with about 87 percent of Sol's mass, 84 to 91 percent of its diameter[1], and around 80 percent of its luminosity. The star may be as as enriched (102 percent) as Sol with elements heavier than hydrogen ("metallicity"), based on its abundance of iron[2].

Alpha Mensae is located about 33.1 light-years from Sol. It lies in the northeastern part of the Constellation Mensa, the Table Mountain -- west of Zeta Volantis, southwest of Gamma2 Volantis, and south of the Large Magellanic Cloud.

The orbit of an Earth-like planet (with liquid water) around this star would be centered around 0.91 AU -- between the orbital distances of Venus and Earth in the Solar System -- with an orbital period of nearly 342 days, close to an Earth year.

(Boilerplate from


  1. Perrin and Karoji, 1987, page 236; and Johnson and Wright, 1983, page 659
  2. Cayrel de Strobel et al, 1991, page 285