Kappa Columbae

κ Columbae
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Columba
Right ascension	06h 16m 33.13512s
Declination	−35° 08′ 25.8630″
Apparent magnitude (V)	4.37
Characteristics
Spectral type	K0.5 IIIa
U−B color index	+0.83
B−V color index	+1.00
Variable type	Suspected
Astrometry
Radial velocity (Rv)	24.20 km/s
Proper motion (μ)	RA: −0.28 mas/yr ; Dec.: +87.94 mas/yr
Parallax (π)	17.87 ± 0.16 mas
Distance	183 ± 2 ly ; (56.0 ± 0.5 pc)
Absolute magnitude (MV)	+0.63
Details
Mass	1.76 M☉
Radius	10.5 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.
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]

References

^ ^a ^b ^c ^d ^e ^f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
^ ^a ^b ^c ^d Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1999), "UBVRIJKL photometry of the bright stars", Commission Lunar and Planetary Laboratory, 4: 99, Bibcode:1966CoLPL...4...99J.
^ ^a ^b ^c ^d ^e Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
^ ^a ^b Samus, N. N.; Durlevich, O. V.; et al. (2004), Combined General Catalogue of Variable Stars (GCVS4.2), retrieved 2016-12-26.
^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
^ ^a ^b Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1.. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(56.0\cdot 1.75\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 21.1\cdot R_{\bigodot }\end{aligned}}$
^ "kap Col -- Variable Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-12-25.
^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
^ Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
^ Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.
^ (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 Archived 2011-08-22 at the Wayback Machine

[vanLeeuwen2007-1] ^ ^a ^b ^c ^d ^e ^f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.

[Johnson1999-2] Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1999), "UBVRIJKL photometry of the bright stars", Commission Lunar and Planetary Laboratory, 4: 99, Bibcode:1966CoLPL...4...99J.

[luck2015-3] Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.

[cgcvs2004-4] Samus, N. N.; Durlevich, O. V.; et al. (2004), Combined General Catalogue of Variable Stars (GCVS4.2), retrieved 2016-12-26.

[Anderson2012-5] Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.

[lang2006-6] Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1.. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(56.0\cdot 1.75\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 21.1\cdot R_{\bigodot }\end{aligned}}$

[SIMBAD-7] "kap Col -- Variable Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-12-25.

[Eggleton2008-8] Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.

[Tetzlaff2011-9] Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.

[Richichi2005-10] Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.

[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 Archived 2011-08-22 at the Wayback Machine

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Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Columba
Right ascension	06^h 16^m 33.13512^s^[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 (R_v)	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 (M_V)	+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