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Star in the constellation Mensa From Wikipedia, the free encyclopedia
Iota Mensae is a single star about 880 light years away in the faint constellation Mensa. It has a very slightly variable apparent magnitude of 6.0, making it visible with the naked eye under good skies.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Mensa |
Right ascension | 05h 35m 36.1787s[1] |
Declination | −78° 49′ 15.129″[1] |
Apparent magnitude (V) | 6.00 - 6.05[2] |
Characteristics | |
Spectral type | B8 III[3] |
B−V color index | −0.022[4] |
Variable type | Ellipsoidal?[2] |
Astrometry | |
Radial velocity (Rv) | 12.6±4.3[5] km/s |
Proper motion (μ) | RA: +5.547[1] mas/yr[1] Dec.: +25.710[1] mas/yr[1] |
Parallax (π) | 3.7076 ± 0.1819 mas[1] |
Distance | 880 ± 40 ly (270 ± 10 pc) |
Absolute magnitude (MV) | −1.03[6] |
Details | |
Mass | 3.6[1] M☉ |
Radius | 9.5[1] R☉ |
Luminosity | 301[1] L☉ |
Surface gravity (log g) | 3.4[7] cgs |
Temperature | 11,272±264[8] K |
Metallicity [Fe/H] | +0.13[9] dex |
Age | 203[1] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Iota Mensae has a spectral type of B8III, indicating that it has exhausted hydrogen at its core and expanded away from the main sequence. It is about 3.6 times the mass (M☉), 301 times as luminous, and has swollen to 9.5 times the radius of the Sun (R☉). It is calculated to be 314 million years old.
It has been catalogued as a chemically peculiar star with abnormally strong lines of silicon in its spectrum but this classification is now considered doubtful.[11] Its brightness varies by a few hundredths of a magnitude. Its period was initially measured at 2.6 days,[12] but this is now considered to be a period of 5.3 days with primary and secondary minima of a similar depth. The variability is thought to be due to the rotation of the star.[2]
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