Delta Columbae

δ Columbae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Columba
Right ascension 06h 22m 06.82831s[1]
Declination −33° 26′ 11.0323″[1]
Apparent magnitude (V) 3.85[2]
Characteristics
Spectral type G7 II[3]
U−B color index +0.52[2]
B−V color index +0.88[2]
Astrometry
Proper motion (μ) RA: −24.23[1] mas/yr
Dec.: −51.40[1] mas/yr
Parallax (π)13.94 ± 0.51 mas[1]
Distance234 ± 9 ly
(72 ± 3 pc)
Absolute magnitude (MV)−0.32[4]
Orbit[5][6]
Period (P)868.78 d
Semi-major axis (a)9.02±0.52 mas
Eccentricity (e)0.7
Inclination (i)116.3±4.2°
Periastron epoch (T)2419915.02 JD
Argument of periastron (ω)
(secondary)		117.1°
Semi-amplitude (K1)
(primary)		10.6 km/s
Details
δ Col A
Luminosity149.5[7] L☉
Surface gravity (log g)2.49[8] cgs
Temperature5,136[4] K
Metallicity [Fe/H]−0.04[8] dex
Rotational velocity (v sin i)4.8±0.2[4] km/s
Other designations
δ Col, CD−33° 2927, HD 44762, HIP 30277, HR 2296, SAO 196735.[9]
Database references
SIMBADdata

Delta Columbae is a binary star system in the constellation Columba. It can be seen with the naked eye having an apparent visual magnitude of 3.85.[2] The distance to this system, based upon an annual parallax shift of 13.94 mas,[1] is around 234 lightyears.

Delta Columbae was a latter designation of 3 Canis Majoris, as the early astronomers Johann Bayer and John Flamsteed did not include the constellation Columba in their star charts.[10] It has the uncommon traditional name Ghusn al Zaitun, from the Arabic الغصن الزيتون al-ghuşn al-zaitūn "the olive branch" (carried by the dove of Noah's Ark).[citation needed]

This is a single-lined spectroscopic binary system with an orbital period of 868.78 days and an eccentricity of 0.7.[5] It has a peculiar velocity of 30.2±3.9 km/s, making it a candidate runaway star system. The primary component is a G-type bright giant star with a stellar classification of G7 II.[3] It radiates around 149[7] time the solar luminosity from its outer atmosphere at an effective temperature of 5,136 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 Johnson1999 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference vonEiff2012 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Pourbaix2004 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Jancart2005 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference luck2014 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Wagman1987 was invoked but never defined (see the help page).