| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Columba |
| Right ascension | 05h17m 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] |
| Distance | 105.8 ± 0.7 ly (32.4 ± 0.2 pc) |
| Absolute magnitude (MV) | +2.17±0.04[6] |
| Details[5] | |
| Mass | 1.57±0.07 M☉ |
| Radius | 5.04±0.14 R☉ |
| Luminosity | 15.5 L☉ |
| Surface gravity (log g) | 3.19±0.03 cgs |
| Temperature | 4,936±28 K |
| Metallicity [Fe/H] | −0.04±0.04 dex |
| Rotational velocity (v sin i) | 1.2[2] km/s |
| Age | 2.17±0.28 Gyr |
| Other designations | |
ο Col, CD−35° 2214, FK5 197, HD 34642, HIP 24659, HR 1743, SAO 195721.[7] | |
| Database references | |
| SIMBAD | data |
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 subgiantorgiant 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]
