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Star in the constellation of Mensa From Wikipedia, the free encyclopedia
Nu Mensae, Latinized from ν Mensae, is a solitary[10] star situated in the southern circumpolar constellation Mensa. It has an apparent magnitude of 5.76,[2] making it faintly visible to the naked eye. The star is relatively close at a distance of 176 light years[1] but is receding with a heliocentric radial velocity of 9.1 km/s.[5]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Mensa |
Right ascension | 04h 20m 58.0721s[1] |
Declination | −81° 34′ 47.719″[1] |
Apparent magnitude (V) | 5.76±0.01[2] |
Characteristics | |
Spectral type | F0/2 III[3] |
U−B color index | +0.05[4] |
B−V color index | +0.35[4] |
Astrometry | |
Radial velocity (Rv) | 9.1±2.8[5] km/s |
Proper motion (μ) | RA: +10.182[1] mas/yr Dec.: +125.469[1] mas/yr |
Parallax (π) | 18.4754 ± 0.0273 mas[1] |
Distance | 176.5 ± 0.3 ly (54.13 ± 0.08 pc) |
Absolute magnitude (MV) | +2.13[6] |
Details | |
Mass | 1.69[7] M☉ |
Radius | 2.3[8] R☉ |
Luminosity | 11.5[9] L☉ |
Surface gravity (log g) | 3.94[7] cgs |
Temperature | 6,921±139[7] K |
Metallicity [Fe/H] | −0.08[7] dex |
Rotational velocity (v sin i) | 108±5[6] km/s |
Age | 1.7[7] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Nu Mensae has a stellar classification of F0/2 III,[3] indicating that it is a giant star with a spectrum intermediate between that of an F0 and F2 star. The star has an angular diameter of 0.41±0.03 mas,[11] and a radius 2.39 times that of the Sun at its estimated distance.[8] At present it has 169% the mass of the Sun[7] and shines at 11.5 times the luminosity of the Sun[9] at an effective temperature of 6,921 K,[7] giving it a white glow with a yellow tint. Despite an age of 1.7 billion years,[7] Nu Mensae spins rapidly with a projected rotational velocity of 108 km/s[6] and is slightly metal deficient relative to the Sun.[7]
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