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) | +3.60[2] |
| Characteristics | |
| Spectral type | A0IV-V + A0V[3] |
| Astrometry | |
| Distance | 358 ± 20 ly (109 ± 6[1] pc) |
| Other designations | |
| Database references | |
| SIMBAD | data |
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,[4] which gives the system a combined apparent magnitude of +3.60.[2] The orbital period of the binary is 35.6 years (13,007.2 days), and the two stars are separated by 0.18 arcseconds.[5]
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".[6] 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).[7]
References
- 1 2 3 van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. Bibcode:2007A&A...474..653V. arXiv:0708.1752
. doi:10.1051/0004-6361:20078357. - 1 2 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.
- 1 2 "CCDM J09036+4709AB -- Double or multiple star", SIMBAD Astronomical Object Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-03-26
- ↑ 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.
- ↑ 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, Bibcode:2010AJ....140.1623M, arXiv:1010.4043 , doi:10.1088/0004-6256/140/6/1623
- ↑ Richard Hinckley Allen :Star Names — Their Lore and Meaning - Ursa Major, the Greater Bear
- ↑ (in 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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