Kappa Columbae

κ Columbae
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]
Distance183 ± 2 ly
(56.0 ± 0.5 pc)
Absolute magnitude (MV)+0.63[5]
Details[3]
Mass1.76 M☉
Radius10.5[6] R☉
Luminosity57.5 L☉
Surface gravity (log g)2.59 cgs
Temperature4,876±33 K
Metallicity [Fe/H]+0.11 dex
Age1.68 Gyr
Other designations
κ Col, CD−35° 2800, FK5 238, HD 43785, HIP 29807, HR 2256, SAO 196643.[7]
Database references
SIMBADdata

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]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Johnson1999 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference luck2015 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference cgcvs2004 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference lang2006 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Richichi2005 was invoked but never defined (see the help page).
  11. ^ (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.
  12. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 16 日