Kappa Ursae Majoris
Epoch J2000.0 Equinox J2000.0
|Right ascension||09h 03m 37.52762s|
|Declination||+47° 09′ 23.4890″|
|Apparent magnitude (V)||+3.60|
|Distance||358 ± 20 ly
(109 ± 6 pc)
|Spectral type||A0IV-V + A0V|
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 and has the traditional names Talitha Australis, Al Kaprah, and Alphikra Australis.
Both components of the binary star are a white A-type main sequence dwarfs. They have apparent magnitudes of +4.2 and +4.4, which gives the system a combined apparent magnitude of +3.60. The orbital period of the binary is 35.6 years (13,007.2 days), and the two stars are separated by 0.18 arcseconds.
Name and etymology
- 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". 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).
- van Leeuwen, F. (November 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.
- Johnson, H. L. et al. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory 4 (99). Bibcode:1966CoLPL...4...99J.
- CCDM J09036+4709AB -- Double or multiple star, SIMBAD Astronomical Object Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-03-26
- 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:1010.4043, Bibcode:2010AJ....140.1623M, doi:10.1088/0004-6256/140/6/1623
- Richard Hinckley Allen :Star Names — Their Lore and Meaning - Ursa Major, the Greater Bear
- (Chinese) (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 21 日
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