Global InformationKappa Columbae information
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Columba |
| Right ascension | 06h 16m 33.13512s[1] |
| Declination | −35° 08′ 25.8630″[1] |
| Apparent magnitude (V) | 4.37[2] |
| Characteristics | |
| Spectral type | K0.5 IIIa[3] |
| U−B color index | +0.83[2] |
| B−V color index | +1.00[2] |
| Variable type | Suspected[4] |
| Astrometry | |
| Radial velocity (Rv) | 24.20[3] km/s |
| Proper motion (μ) | RA: −0.28[1] mas/yr Dec.: +87.94[1] mas/yr |
| Parallax (π) | 17.87 ± 0.16 mas[1] |
| Distance | 183 ± 2 ly (56.0 ± 0.5 pc) |
| Absolute magnitude (MV) | +0.63[5] |
| Details[3] | |
| Mass | 1.76 M☉ |
| Radius | 10.5[6] R☉ |
| Luminosity | 57.5 L☉ |
| Surface gravity (log g) | 2.59 cgs |
| Temperature | 4,876±33 K |
| Metallicity [Fe/H] | +0.11 dex |
| Age | 1.68 Gyr |
| Other designations | |
κ Col, CD−35° 2800, FK5 238, HD 43785, HIP 29807, HR 2256, SAO 196643.[7] | |
| Database references | |
| SIMBAD | data |
Kappa Columbae, Latinized from κ Columbae, is a solitary[8] star in the southern constellation of Columba. It has an apparent visual magnitude of 4.37,[2] which is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 17.87 mas,[1] it is located at a distance of 183 light years from the Sun. It has a peculiar velocity of 20.2±1.9 km/s, making it a candidate runaway star.[9]
This is an evolved K-type giant star with a stellar classification of K0.5 IIIa.[3] The measured angular diameter of this star, after correction for limb darkening, is 1.75±0.03 mas.[10] At the estimated distance of this star, this yields a physical size of about 10.5 times the radius of the Sun.[6] It has an estimated 1.76 times the mass of the Sun and is about 1.7 billion years old. The star radiates 57.5 times the solar luminosity from its outer atmosphere at an effective temperature of 4,876 K.[3] It is catalogued as a suspected variable star.[4]
In Chinese, 孫 (Sūn), meaning Grandson, refers to an asterism consisting of κ Columbae and θ Columbae.[11] Consequently, κ Columbae itself is known as 孫一 (Sūn yī, English: the First Star of Grandson.).[12]
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Richichi2005was invoked but never defined (see the help page). - ^ (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
- ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 16 日