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.^[3] The distance to this system, based upon an annual parallax shift of 13.94 mas,^[2] is around 234 lightyears.

δ Columbae

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Columba[1]
Right ascension	06h 22m 06.82831s[2]
Declination	−33° 26′ 11.0323″[2]
Apparent magnitude (V)	3.85[3]
Characteristics
Spectral type	G7 II[4]
U−B color index	+0.52[3]
B−V color index	+0.88[3]
Astrometry
Proper motion (μ)	RA: −24.23[2] mas/yr Dec.: −51.40[2] mas/yr
Parallax (π)	13.94±0.51 mas[2]
Distance	234 ± 9 ly (72 ± 3 pc)
Absolute magnitude (MV)	−0.32[5]
Orbit[6][7]
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
Luminosity	149.5[8] L☉
Surface gravity (log g)	2.49[9] cgs
Temperature	5,136[5] K
Metallicity [Fe/H]	−0.04[9] dex
Rotational velocity (v sin i)	4.8±0.2[5] km/s
Other designations
δ Col, CD−33°2927, HD 44762, HIP 30277, HR 2296, SAO 196735.[10]
Database references
SIMBAD	data

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.^[11]

This is a single-lined spectroscopic binary system with an orbital period of 868.78 days and an eccentricity of 0.7.^[6] 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.^[4] It radiates around 149^[8] time the solar luminosity from its outer atmosphere at an effective temperature of 5,136 K.^[5]