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 (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]
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]
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 (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]
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]