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HD 37811

HD 37811
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]
Distance382 ± 2 ly
(117.1 ± 0.7 pc)
Absolute magnitude (MV)+0.14[7]
Details[7]
Mass3.0±0.1 M☉
Radius11.68±0.20 R☉
Luminosity86±2 L☉
Surface gravity (log g)2.81±0.08 cgs
Temperature5,139±34 K
Metallicity [Fe/H]0.01±0.03 dex
Rotational velocity (v sin i)2.4±1.1[8] km/s
Age440[9] Myr
Other designations
39 G. Columbae, CD−32°2479, CPD−32°879, GC 7082, HD 37811, HIP 26649, HR 1958, SAO 196061[10][11]
Database references
SIMBADdata

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]

  1. ^ a b c d e Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Jones2011 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1982 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Wilson1953 was invoked but never defined (see the help page).
  7. ^ a b c d e f g Cite error: The named reference Ottoni2022 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference DeMederios2014 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Dotter2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
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