Omicron Columbae

"o Columbae" redirects here. For O Columbia, see O Columbia.
Omicron Columbae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Columba
Right ascension 05h 17m 29.08929s[1]
Declination −34° 53′ 42.7444″[1]
Apparent magnitude (V) 4.81[2]
Characteristics
Spectral type K1 IV[3] or K1 III[2]
U−B color index +0.80[4]
B−V color index +1.00[4]
Astrometry
Radial velocity (Rv)21.10±0.09[5] km/s
Proper motion (μ) RA: +92.67[1] mas/yr
Dec.: −336.23[1] mas/yr
Parallax (π)30.82 ± 0.20 mas[1]
Distance105.8 ± 0.7 ly
(32.4 ± 0.2 pc)
Absolute magnitude (MV)+2.17±0.04[6]
Details[5]
Mass1.57±0.07 M☉
Radius5.04±0.14 R☉
Luminosity15.5 L☉
Surface gravity (log g)3.19±0.03 cgs
Temperature4,936±28 K
Metallicity [Fe/H]−0.04±0.04 dex
Rotational velocity (v sin i)1.2[2] km/s
Age2.17±0.28 Gyr
Other designations
ο Col, CD−35° 2214, FK5 197, HD 34642, HIP 24659, HR 1743, SAO 195721.[7]
Database references
SIMBADdata

Omicron Columbae is a star in the southern constellation Columba. It has an apparent visual magnitude of 4.81,[2] which is bright enough to be faintly visible to the naked eye. The distance to this star, as determined by an annual parallax shift of 30.82 mas,[1] is 105.8 light years. The visual magnitude is reduced by an interstellar absorption factor of 0.06 due to intervening dust.[5]

Depending on the source, this star has been given a stellar classification of K1 III[2] or K1 IV,[3] suggesting that it is a K-type star currently in the subgiant or giant stage of its evolution. It has 1.57 times the Sun's mass and has expanded to more than five times the radius of the Sun.[5] The star appears to be spinning slowly with a projected rotational velocity of 1.2 km/s,[2] and is around 2.2 billion years old. It is estimated to radiate 15.5 times the solar luminosity from its outer atmosphere at an effective temperature of 4,936 K.[5]

Omicron Columbae is a high proper motion star that may share a common proper motion with the object WISE J051723.87−345121.8. The two have an angular separation of 159 arc seconds.[8]

  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 e f Cite error: The named reference Setaiwan2004 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Gray2003 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Cousins1969 was invoked but never defined (see the help page).
  5. ^ a b c d e Cite error: The named reference Jofre2015 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference daSilva2006 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 Luhman was invoked but never defined (see the help page).