Delta Columbae

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. The distance to this system, based upon an annual parallax shift of 13.94 mas, is around 234 light years.

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. It has the uncommon traditional name Ghusn al Zaitun, from the Arabic الغصن الزيتون al-ghuşn al-zaitūn "the olive branch". In early Arabian astronomy, this star, along with ζ CMa, λ CMa, γ Col, θ Col, κ Col, λ Col, μ Col and ξ Col, formed Al Ḳurūd (ألقرد - al-qird), the Apes.

This is a single-lined spectroscopic binary system with an orbital period of 868.78 days and an eccentricity of 0.7. It has a peculiar velocity of 7004302000000000000♠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. It radiates around 149 time the solar luminosity from its outer atmosphere at an effective temperature of 5,136 K.