Astrometric binary star system in the constellation Mensa
γ Mensae
Location of γ Mensae (circled)
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation
Mensa
Right ascension
05h 31m 53.01393s[1]
Declination
−76° 20′ 27.4779″[1]
Apparent magnitude (V)
5.19[2]
Characteristics
Spectral type
K2 III[3][4]
U−B color index
+1.18[2]
B−V color index
+1.13[2]
Astrometry
Radial velocity (Rv)
+56.7±0.8[5] km/s
Proper motion (μ)
RA: +140.646[6] mas/yr Dec.: +269.634[6] mas/yr
Parallax (π)
31.1021 ± 0.1519 mas[6]
Distance
104.9 ± 0.5 ly (32.2 ± 0.2 pc)
Absolute magnitude (MV)
+2.70[7]
Orbit[8]
Period (P)
7.455±4.857 yr
Semi-major axis (a)
51±10″
Eccentricity (e)
0.59±0.15
Inclination (i)
53±8°
Longitude of the node (Ω)
117±90°
Periastron epoch (T)
1995.111±4.085
Argument of periastron (ω) (secondary)
124±74°
Details[9]
γ Men A
Mass
1.04 M☉
Radius
4.99 R☉
Luminosity
21 L☉
Surface gravity (log g)
2.76[3] cgs
Temperature
4,491[3] K
Metallicity [Fe/H]
+0.22 dex
Age
10.60 Gyr
Other designations
γ Men, CD−76° 222, HD 37763, HIP 25918, HR 1953, SAO 256201[10]
Database references
SIMBAD
data
Gamma Mensae, Latinized from γ Mensae, is an orange-hued star system in the southern constellation of Mensa. The apparent visual magnitude of 5.19[2] indicates it is dimly visible to the naked eye. Based upon an annual parallax shift of 7.70 mas as seen from the Earth,[1] it is about 102 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.033 due to interstellar dust.[9] The system shows the high velocity kinematic properties of a population II star, but has Sun-like abundances of most elements.[11]
This is a probable astrometric binary system[4] with poorly constrained orbital elements. The visible member, component A, is an evolved K-type giant star with a stellar classification K2 III[3] At about 10.6 billion years of age, it has nearly the same mass as the Sun but has expanded to five times the Sun's radius.[9] The star shines with 21 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,491 K.[3]
^ abcCite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
^ abcdCite error: The named reference Johnson1966 was invoked but never defined (see the help page).
^ abcdeCite error: The named reference Gray2006 was invoked but never defined (see the help page).
^ abCite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
^Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
^ abcBrown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
^Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
^Cite error: The named reference Hartkopf2006 was invoked but never defined (see the help page).
^ abcCite error: The named reference Wittenmyer2016 was invoked but never defined (see the help page).
^Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
^Cite error: The named reference Foy1980 was invoked but never defined (see the help page).
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hawaii.edu. July 16, 2003. Archived from the original on January 4, 2011. "Gamma-Ray Evidence Suggests Ancient Mars Had Oceans". SpaceRef. November 17, 2008...
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Steve B.; Lundkvist, Mia S. (2021-12-01). "TESS Asteroseismology of α Mensae: Benchmark Ages for a G7 Dwarf and Its M Dwarf Companion". The Astrophysical...
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Longmire, J.L.; Litvak, M.L.; Ton'chev, A.K. (2004). "The Mars Odyssey Gamma-Ray Spectrometer Instrument Suite". Space Science Reviews. 110 (1/2). Springer...
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