Kappa Ursae Majoris

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Kappa Ursae Majoris
Kappa Ursae Majoris is located in 100x100
Kappa Ursae Majoris

Location of κ Ursae Majoris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major
Right ascension 09h 03m 37.52762s[1]
Declination +47° 09′ 23.4890″[1]
Apparent magnitude (V) 3.56 (4.16 + 4.54)[2]
Spectral type A0 IV-V + A0 V[3]
Proper motion (μ) RA: −36.19[1] mas/yr
Dec.: −55.40[1] mas/yr
Parallax (π) 9.10 ± 0.50[1] mas
Distance 360 ± 20 ly
(110 ± 6 pc)
Absolute magnitude (MV) −1.63[4]
Period (P) 13,007.2±9.7 d
Semi-major axis (a) 0.18194 ± 0.00025
Eccentricity (e) 0.5584±0.0015
Inclination (i) 109.410±0.066°
Longitude of the node (Ω) 105.641±0.080°
Periastron epoch (T) 50404 ± 12
Argument of periastron (ω)
Other designations
Talitha[citation needed], Talitha Australis[citation needed], Alphikra Australis[citation needed], κ UMi, 12 Ursae Minoris, BD+47° 1633, FK5 341, GC 12503, HD 77327, HIP 44471, HR 3594, SAO 42661, PPM 50987, CCDM J09036+4709AB, WDS J09036+4709AB[6]
Database references

Kappa Ursae Majoris (Kappa UMa, κ Ursae Majoris, κ UMa) is a binary star in the constellation Ursa Major. It is approximately 358 light years from Earth.

Both components of the binary star are a white A-type main sequence dwarfs. They have apparent magnitudes of +4.2 and +4.5,[7] which gives the system a combined apparent magnitude of +3.60.[8] The orbital period of the binary is 35.6 years (13,007.2 days), and the two stars are separated by 0.18 arcseconds.[9]

Name and etymology[edit]

  • The traditional name Talitha' (share with ι UMa) comes from the Arabic phrase Al Fiḳrah al Thalitha "the third spring, or leap, of the ghazal".[10] The term Australis meaning "the south side" in Latin.
  • In Chinese, 三台 (Sān Tái), meaning Three Steps, refers to an asterism consisting of κ Ursae Majoris, ι Ursae Majoris, λ Ursae Majoris, μ Ursae Majoris, ν Ursae Majoris and ξ Ursae Majoris. Consequently, κ Ursae Majoris itself is known as 三台二 (Sān Tái èr, English: the Second Star of Three Steps) and 上台二 (Shàng Tái èr, English: Star of Second Upper Step).[11]


  1. ^ a b c d e van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ 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:0806.2878Freely accessible, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x. 
  3. ^ Edwards, T. W. (April 1976), "MK classification for visual binary components", Astronomical Journal, 81: 245–249, Bibcode:1976AJ.....81..245E, doi:10.1086/111879 
  4. ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971Freely accessible, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015. 
  5. ^ Hartkopf, W. I.; et al. (June 30, 2006), Sixth Catalog of Orbits of Visual Binary Stars, United States Naval Observatory, retrieved 2017-06-02. 
  6. ^ "CCDM J09036+4709AB -- Double or multiple star", SIMBAD Astronomical Object Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-03-26 
  7. ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. 
  8. ^ Johnson, H. L.; et al. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99): 99. Bibcode:1966CoLPL...4...99J. 
  9. ^ Muterspaugh, Matthew W.; et al. (December 2010), "The Phases Differential Astrometry Data Archive. II. Updated Binary Star Orbits and a Long Period Eclipsing Binary", The Astronomical Journal, 140 (6): 1623–1630, arXiv:1010.4043Freely accessible, Bibcode:2010AJ....140.1623M, doi:10.1088/0004-6256/140/6/1623 
  10. ^ Richard Hinckley Allen :Star Names — Their Lore and Meaning - Ursa Major, the Greater Bear
  11. ^ (in Chinese) (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 21 日