Kappa Ursae Majoris

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
Distance358 ± 20 ly
(109 ± 6[1] pc)
Other designations
Talitha, Talitha Australis, Alphikra Australis, κ Ursae Majoris, κ UMa, Kappa UMa, 12 Ursae Majoris, BD+47 1633, CCDM J09036+4709AB, FK5 341, GC 12503, HD 77327, HIP 44471, HR 3594, IDS 08568+4733, PPM 50987, SAO 42661, WDS J09036+4709AB.[3]
Database references
SIMBADdata

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 +4.5,[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

References

  1. 1 2 3 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. 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.
  3. 1 2 "CCDM J09036+4709AB -- Double or multiple star", SIMBAD Astronomical Object Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-03-26
  4. 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.
  5. 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
  6. Richard Hinckley Allen :Star Names — Their Lore and Meaning - Ursa Major, the Greater Bear
  7. (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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