Eta Columbae

η Columbae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Columba
Right ascension 05h 59m 08.80519s[1]
Declination −42° 48′ 54.4822″[1]
Apparent magnitude (V) 3.96[2]
Characteristics
Spectral type G8/K1 II[3] or K0 III[4]
U−B color index +1.08[2]
B−V color index +1.14[2]
Astrometry
Radial velocity (Rv)+17.0[4] km/s
Proper motion (μ) RA: +18.39[1] mas/yr
Dec.: −10.87[1] mas/yr
Parallax (π)6.91 ± 0.12 mas[1]
Distance472 ± 8 ly
(145 ± 3 pc)
Absolute magnitude (MV)−2.10[5]
Details[4]
Mass3.33 M☉
Radius38.6[6] R☉
Luminosity708 L☉
Surface gravity (log g)1.72 cgs
Temperature4,620±54 K
Metallicity [Fe/H]−0.01 dex
Other designations
η Col, CD−42° 2266, FK5 229, HD 40808, HIP 28328, HR 2120, SAO 217650.[7]
Database references
SIMBADdata

Eta Columbae is a solitary[8] star near the southern boundary of the constellation Columba.[9] It is visible to the naked eye, having an apparent visual magnitude of 3.96.[2] Based upon an annual parallax shift of 6.91 mas,[1] it lies at a distance of roughly 472 light years from the Sun.

This is an orange-hued[9] K-type giant star with a stellar classification of K0 III,[4] or possibly a bright giant with a crossover class of G8/K1 II.[3] The measured angular diameter of this star, after correction for limb darkening, is 2.48±0.03 mas.[10] At the estimated distance of this star, this yields a physical size of about 38.6 times the radius of the Sun.[6] It has an estimated 3.33 times the mass of the Sun and radiates 708 times the solar luminosity from its outer atmosphere at an effective temperature of 4,620 K.[4]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1978 was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference luck2015 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference BohmVitense2000 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference lang2006 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Kambic2009 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Richichi2005 was invoked but never defined (see the help page).