Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Columba |
Right ascension | 05h 39m 49.8397s[1] |
Declination | −32° 37′ 45.1772″[1] |
Apparent magnitude (V) | 5.44±0.01[2] |
Characteristics | |
Evolutionary stage | RGB[3] |
Spectral type | G6/8 III[4] |
B−V color index | +0.92[5] |
Astrometry | |
Radial velocity (Rv) | −8.3±2[6] km/s |
Proper motion (μ) | RA: −16.691 mas/yr[1] Dec.: −31.588 mas/yr[1] |
Parallax (π) | 8.5366 ± 0.0492 mas[1] |
Distance | 382 ± 2 ly (117.1 ± 0.7 pc) |
Absolute magnitude (MV) | +0.14[7] |
Details[7] | |
Mass | 3.0±0.1 M☉ |
Radius | 11.68±0.20 R☉ |
Luminosity | 86±2 L☉ |
Surface gravity (log g) | 2.81±0.08 cgs |
Temperature | 5,139±34 K |
Metallicity [Fe/H] | 0.01±0.03 dex |
Rotational velocity (v sin i) | 2.4±1.1[8] km/s |
Age | 440[9] Myr |
Other designations | |
Database references | |
SIMBAD | data |
HD 37811 (HR 1958) is a solitary[12] star in the southern constellation Columba. It has an apparent magnitude of 5.44,[2] allowing it to be faintly seen with the naked eye. Parallax measurements place the object at a distance of 382 light years[1] and it is currently approaching with a heliocentric radial velocity of −8.3 km/s.[6]
HD 37811 has a stellar classification of G6/8 III[4] — intermediate between a G6 and G8 giant star that is currently on the red giant branch.[3] It has 3 times the mass of the Sun[7] but has expanded to 11.7 times its girth[7] at an age of 440 million years.[9] It shines with a luminosity of 86 L☉[7] from its enlarged photosphere at an effective temperature of 5,139 K,[7] giving a yellow glow. HD 37811 has a solar metallicity[7] and spins leisurely with a projected rotational velocity of about 2.4 km/s.[8]