HD 37811
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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Columba[1] |
| Right ascension | 05h 39m 49.8397s[2] |
| Declination | −32° 37′ 45.1772″[2] |
| Apparent magnitude (V) | 5.44±0.01[3] |
| Characteristics | |
| Evolutionary stage | RGB[4] |
| Spectral type | G6/8 III[5] |
| B−V color index | +0.92[6] |
| Astrometry | |
| Radial velocity (Rv) | −8.3±2[7] km/s |
| Proper motion (μ) | RA: −16.691 mas/yr[2] Dec.: −31.588 mas/yr[2] |
| Parallax (π) | 8.5366±0.0492 mas[2] |
| Distance | 382 ± 2 ly (117.1 ± 0.7 pc) |
| Absolute magnitude (MV) | +0.14[8] |
| Details[8] | |
| 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[9] km/s |
| Age | 440[10] Myr |
| Other designations | |
| 39 G. Columbae, CD−32°2479, CPD−32°879, GC 7082, HD 37811, HIP 26649, HR 1958, SAO 196061[11][12] | |
| Database references | |
| SIMBAD | data |
HD 37811 (HR 1958) is a solitary[13] star in the southern constellation Columba. It has an apparent magnitude of 5.44,[3] allowing it to be faintly seen with the naked eye. Parallax measurements place the object at a distance of 382 light years[2] and it is currently approaching with a heliocentric radial velocity of −8.3 km/s.[7]
HD 37811 has a stellar classification of G6/8 III[5] — intermediate between a G6 and G8 giant star that is currently on the red giant branch.[4] It has 3 times the mass of the Sun[8] but has expanded to 11.7 times its girth[8] at an age of 440 million years.[10] It shines with a luminosity of 86 L☉[8] from its enlarged photosphere at an effective temperature of 5,139 K,[8] giving a yellow glow. HD 37811 has a solar metallicity[8] and spins leisurely with a projected rotational velocity of about 2.4 km/s.[9]
