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Star in the constellation Mensa From Wikipedia, the free encyclopedia
HD 31975 (HR 1606) is a star situated in the southern circumpolar constellation Mensa. It has an apparent magnitude of 6.28, which is near the threshold of naked eye visibility. It is relatively close at a distance of about 106 light years[1] but is receding with a heliocentric radial velocity of 26.9 km/s.[5]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Mensa |
Right ascension | 04h 53m 05.6446s[1] |
Declination | −72° 24′ 27.6449″[1] |
Apparent magnitude (V) | 6.28[2] |
Characteristics | |
Spectral type | F9 V Fe−0.5[3] |
U−B color index | +0.01[4] |
B−V color index | +0.52[4] |
Astrometry | |
Radial velocity (Rv) | 26.8 ± 0.3[5] km/s |
Proper motion (μ) | RA: −46.178[1] mas/yr Dec.: +270.916[1] mas/yr |
Parallax (π) | 30.8217 ± 0.0217 mas[1] |
Distance | 105.82 ± 0.07 ly (32.44 ± 0.02 pc) |
Absolute magnitude (MV) | +3.72[2] |
Details | |
Mass | 1.13[6] M☉ |
Radius | 1.46[6] R☉ |
Luminosity | 2.77[6] L☉ |
Surface gravity (log g) | 4.16[6] cgs |
Temperature | 6.165[6] K |
Metallicity [Fe/H] | 0.00[7] dex |
Rotational velocity (v sin i) | 6[8] km/s |
Age | 3.5[7] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
HD 31975 has a stellar classification of F9 V Fe−0.5, indicating that it is a F-type main-sequence star with a mild under abundance of iron in its atmosphere.[3] At present it has 120% the mass of the Sun and 146% the radius of the Sun.[6] It shines at double the luminosity of the Sun from its photosphere at an effective temperature of 6,165 K,[6] giving it a yellow-white glow. HD 31975 has a similar metallicity to the Sun[7] and at an age of 3.5 billion years[7] it spins slowly with a projected rotational velocity of 6 km/s.[8]
The Washington Double Star Catalog lists a faint M5 companion 16.5" away, which is related to the star.[9]
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