Delta Columbae

δ Columbae

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Columba
Right ascension	Template:RA
Declination	Template:DEC
Apparent magnitude (V)	3.85
Characteristics
Spectral type	G7 II
U−B Template:Engvar	+0.52
B−V Template:Engvar	+0.88
Astrometry
Proper motion (μ)	RA: −24.23 mas/yr Dec.: −51.40 mas/yr
Parallax (π)	13.94±0.51 mas
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)	−0.32
Orbit
Period (P)	868.78 d
Semi-major axis (a)
Eccentricity (e)	0.7
Inclination (i)	°
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 Template:Solar luminosity
Surface gravity (log g)	2.49 cgs
Temperature	5,136 K
Metallicity [Fe/H]	−0.04 dex
Rotational velocity (v sin i)	km/s
Metallicity [Fe/H]	{{{metal_fe2}}} dex
Other designations
δ Col, CD−33°2927, HD 44762, HIP 30277, HR 2296, SAO 196735.
Database references
SIMBAD	data

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 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.

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 , 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.