Kappa Columbae
Star in the constellation Columba
From Wikipedia, the free encyclopedia
Kappa Columbae is a solitary[8] star in the southern constellation of Columba. Its name is a Bayer designation that is Latinized from κ Columbae, and abbreviated Kappa Col or κ Col. It has an apparent visual magnitude of 4.37,[3] which is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 17.38 mas,[2] it is located at a distance of 187.6 light-years (57.5 pc) from the Sun. It has a peculiar velocity of 20.2±1.9 km/s, making it a candidate runaway star.[9]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Columba[1] |
| Right ascension | 06h 16m 33.135s[2] |
| Declination | −35° 08′ 25.85″[2] |
| Apparent magnitude (V) | 4.37[3] |
| Characteristics | |
| Evolutionary stage | red giant branch[2] |
| Spectral type | K0.5 IIIa[4] or G9IIIb CN0.5[5] |
| U−B color index | +0.83[3] |
| B−V color index | +1.00[3] |
| Variable type | Suspected[6] |
| Astrometry | |
| Radial velocity (Rv) | 23.20±0.13[2] km/s |
| Proper motion (μ) | RA: +0.614 mas/yr[2] Dec.: +87.903 mas/yr[2] |
| Parallax (π) | 17.3842±0.0832 mas[2] |
| Distance | 187.6 ± 0.9 ly (57.5 ± 0.3 pc) |
| Absolute magnitude (MV) | +0.63[1] |
| Details | |
| Mass | 2.50+0.50 −0.04[2] M☉ |
| Radius | 10.7±0.2[2] R☉ |
| Luminosity | 60.73+0.55 −0.54[2] L☉ |
| Surface gravity (log g) | 2.682 cgs |
| Temperature | 4,937+5 −6[2] K |
| Metallicity [Fe/H] | +0.11[4] dex |
| Age | 622+64 −253[2] Myr |
| Other designations | |
| κ Col, NSV 2897, CD−35°2800, FK5 238, GC 8062, HD 43785, HIP 29807, HR 2256, SAO 196643[7] | |
| Database references | |
| SIMBAD | data |
This is an evolved K-type giant star with a stellar classification of K0.5 IIIa.[4] At the age of 622 million years, it has 2.50 times the mass of the Sun and has expanded to 10.7 times the Sun's radius.The star radiates 60.7 times the solar luminosity from its outer atmosphere at an effective temperature of 4,937 K.[2] It is catalogued as a suspected variable star.[6]
In Chinese, 孫 (Sūn), meaning Grandson, refers to an asterism consisting of κ Columbae and θ Columbae.[10] Consequently, κ Columbae itself is known as 孫一 (Sūn yī, English: the First Star of Grandson).[11]