Kappa Boötis

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κ Boötis
Observation data
Epoch {{{epoch}}}      Equinox
Constellation Boötes
κ1 Boötis
Right ascension  14h 13m 27.824s[1]
Declination +51° 47′ 16.62″[1]
Apparent magnitude (V) +6.69[2]
κ2 Boötis
Right ascension  14h 13m 29.009s[3]
Declination +51° 47′ 23.88″[3]
Apparent magnitude (V) +4.50 to +4.58[4]
κ1 Boötis
Spectral type F2V[5]
κ2 Boötis
Spectral type A8IV[6]
U−B color index 0.14
B−V color index 0.2
R−I color index 0.12
Variable type Delta Scuti variable[4]
κ1 Boötis
Radial velocity (Rv)−22.09[1] km/s
Proper motion (μ) RA: 44.094[1] mas/yr
Dec.: -39.325[1] mas/yr
Parallax (π)20.3067 ± 0.2221[1] mas
Distance161 ± 2 ly
(49.2 ± 0.5 pc)
Absolute magnitude (MV)+3.34
κ2 Boötis
Radial velocity (Rv)−15.60[7] km/s
Proper motion (μ) RA: 44.094[3] mas/yr
Dec.: -39.325[3] mas/yr
Parallax (π)21.1980 ± 0.4118[3] mas
Distance154 ± 3 ly
(47.2 ± 0.9 pc)
κ1 Boötis
Mass1.40[8] M
Radius1.43[1] R
Luminosity3.801[1] L
Surface gravity (log g)4.32[5] cgs
Temperature6,699[9] K
Metallicity [Fe/H]-0.09[9] dex
Rotational velocity (v sin i)38[10] km/s
Age900[9] Myr
κ2 Boötis
Mass2.12[11] M
Radius2.78[11] R
Luminosity28[6] L
Surface gravity (log g)3.66[5] cgs
Temperature7,760[6] K
Metallicity [Fe/H]-0.29[12] dex
Rotational velocity (v sin i)128[8] km/s
Other designations
Asellus Tertius, κ Boo, 17 Boötis, BD+52 1782
κ1 Boötis: HR 5328, HD 124674, HIP 69481, SAO 29045
κ2 Boötis: HR 5328, HD 124675, HIP 69483, SAO 29046
Database references

Kappa Boötis (κ Boo, κ Boötis) is a double star in the constellation Boötes. It has the traditional name Asellus Tertius /əˈsɛləs ˈtɜːrʃiəs/ (Latin for "third donkey colt")[13][14] and the Flamsteed designation 17 Boötis. The components are separated by an angular distance of 13.5 arcsec,[14] viewable in a small telescope. Kappa Boötis is approximately 155 light years from Earth.


This star, along with the other Aselli (θ Boo and ι Boo) and λ Boo, were Aulād al Dhiʼbah (أولاد الضّباع - aulād al dhiʼba), "the Whelps of the Hyenas".[15]

In Chinese, 天槍 (Tiān Qiāng), meaning Celestial Spear, refers to an asterism consisting of κ (actually κ2) Boötis, ι Boötis and θ Boötis.[16] Consequently, the Chinese name for κ Boötis itself is 天槍一 (Tiān Qiāng yī, English: the First Star of Celestial Spear.)[17]


κ1 Boötis is a spectroscopic binary star system; the visible primary is an F2 main sequence star, while the secondary is half the mass and much fainter.[18]

κ2 Boötis is classified as a Delta Scuti type variable star with a period of 1.08 hours[6] Its brightness varies from magnitude +4.50 to +4.58.[4] It is a slightly evolved A8 subgiant.


  1. ^ a b c d e f g h Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". VizieR On-line Data Catalog. Bibcode:2002yCat.2237....0D.
  3. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  4. ^ a b c Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally Published In: 2009yCat....102025S. 1: B/gcvs. Bibcode:2009yCat....102025S.
  5. ^ a b c Gray, R. O.; Napier, M. G.; Winkler, L. I. (2001). "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars". The Astronomical Journal. 121 (4): 2148. Bibcode:2001AJ....121.2148G.
  6. ^ a b c d Balona, L. A.; Dziembowski, W. A. (October 1999), "Excitation and visibility of high-degree modes in stars", Monthly Notices of the Royal Astronomical Society, 309 (1): 221–232, Bibcode:1999MNRAS.309..221B, doi:10.1046/j.1365-8711.1999.02821.x
  7. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. Bibcode:2006AstL...32..759G.
  8. ^ a b Zorec, J.; Royer, F.; Asplund, Martin; Cassisi, Santi; Ramirez, Ivan; Melendez, Jorge; Bensby, Thomas; Feltzing, Sofia (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691.
  9. ^ a b c Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey". Astronomy and Astrophysics. 530: A138. arXiv:1103.4651. Bibcode:2011A&A...530A.138C. doi:10.1051/0004-6361/201016276.
  10. ^ Royer, F.; Grenier, S.; Baylac, M. -O.; Gómez, A. E.; Zorec, J. (2002). "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin I". Astronomy and Astrophysics. 393 (3): 897–911. arXiv:1201.2052. Bibcode:2002A&A...393..897R. doi:10.1051/0004-6361:20020943.
  11. ^ a b Liakos, Alexios; Niarchos, Panagiotis (2017). "Catalogue and properties of δ Scuti stars in binaries". Monthly Notices of the Royal Astronomical Society. 465 (1): 1181. Bibcode:2017MNRAS.465.1181L.
  12. ^ Gáspár, András; Rieke, George H.; Ballering, Nicholas (2016). "The Correlation between Metallicity and Debris Disk Mass". The Astrophysical Journal. 826 (2): 171. Bibcode:2016ApJ...826..171G.
  13. ^ Star Name - R.H.Allen p.105
  14. ^ a b Kaler, Jim. "Asellus Tertius". Retrieved 2017-09-06.
  15. ^ Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York: Dover Publications Inc. p. 105. ISBN 978-0-486-21079-7. Retrieved 2010-12-12.
  16. ^ ‹See Tfd›(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.
  17. ^ ‹See Tfd›(in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived 2010-08-11 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
  18. ^ Halbwachs, J. -L; Arenou, F.; Pourbaix, D.; Famaey, B.; Guillout, P.; Lebreton, Y.; Salomon, J. -B.; Tal-Or, L.; Ibata, R.; Mazeh, T. (2014). "Masses of the components of SB2 binaries observed with Gaia - I. Selection of the sample and mass ratios of 20 new SB2s discovered with Sophie". Monthly Notices of the Royal Astronomical Society. 445 (3): 2371. Bibcode:2014MNRAS.445.2371H.

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