Kappa Boötis

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Kappa Boötis (κ Boo, κ Boötis) is a double star in the constellation Boötes. It has the traditional name Asellus Tertius (Latin for "third donkey colt")[1][2] and the Flamsteed designation 17 Boötis. The components are separated by an angular distance of 13.5 arcsec[2], 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".[3]

In Chinese, 梗河 (Tiān Qiāng), meaning Celestial Spear, refers to an asterism consisting of κ (actually κ2) Boötis, ι Boötis and θ Boötis.[4] Consequently, κ Boötis itself is known as 天槍一 (Tiān Qiāng yī, English: the First Star of Celestial Spear.)[5]

κ1 Boötis[edit]

κ1 Boötis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Boötes
Right ascension 14h 13m 27.80713s
Declination +51° 47′ 16.2525″
Apparent magnitude (V) +6.62
Distance151 ± 7 ly
(46 ± 2 pc)
Spectral typeF1V
Database references

Kappa1 Boötis is a spectroscopic binary star system.

κ2 Boötis[edit]

κ2 Boötis
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 14h 13m 29.0078s
Declination +51° 47′ 23.874″
Apparent magnitude (V) +4.50 to +4.58
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
Radial velocity (Rv)-17.4 km/s
Proper motion (μ) RA: 61.39 mas/yr
Dec.: -10.57 mas/yr
Parallax (π)21.03 ± 0.83 mas
Distance155 ± 6 ly
(48 ± 2 pc)
Luminosity28[6] L
Temperature7,760[6] K
Other designations
Asellus Tertius, 17 Boötis, HR 5329+HR 5328, HD 124675+HD 124674, BD+52°1782, HIP 69483+HIP 69481, SAO 29046+SAO 29045.
Database references
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

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. HR 5328


  1. ^ Star Name - R.H.Allen p.105
  2. ^ a b Kaler, Jim. "Asellus Tertius". Retrieved 2017-09-06. 
  3. ^ Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York: Dover Publications Inc. p. 105. ISBN 0-486-21079-0. Retrieved 2010-12-12. 
  4. ^ (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.
  5. ^ (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.
  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 

External links[edit]