10 Ursae Majoris

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10 Ursae Majoris
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension 09h 00m 38.38067s[1]
Declination +41° 46′ 58.6051″[1]
Apparent magnitude (V) 3.960[2] (4.18 / 6.48)[3]
Spectral type F3V + K0V[4]
U−B color index +0.04[2]
B−V color index +0.43[2]
Radial velocity (Rv)26.4 ± 0.9[5] km/s
Proper motion (μ) RA: -474.31[1] mas/yr
Dec.: -204.21[1] mas/yr
Parallax (π)62.23 ± 0.68[1] mas
Distance52.4 ± 0.6 ly
(16.1 ± 0.2 pc)
Period (P)7691.0 ± 1.8 d
Semi-major axis (a)0.64566 ± 0.00056″
Eccentricity (e)0.15075 ± 0.00084
Inclination (i)131.366 ± 0.099°
Longitude of the node (Ω)203.74 ± 0.10°
Periastron epoch (T)JD 2449263.1 ± 9.1
Argument of periastron (ω)
32.30 ± 0.44°
10 UMa A
Mass1.44 M
Luminosity4.285 L
Temperature6740 K
10 UMa B
Mass0.89 M
Luminosity0.638 L
Temperature5250 K
Other designations
BD+42° 1956, FK5 339, GJ 332, HD 76943, HIP 44248, HR 3579, SAO 42642
Database references
10 UMa B

10 Ursae Majoris (10 UMa) is a star in the constellation Lynx. Its apparent magnitude is 3.960.[2] It is also fairly close, at 52.4 light-years (16.1 parsecs) away from Earth.[1]

It is the third-brightest star in Lynx. Originally in the neighbouring constellation Ursa Major, it became part of Lynx with the official laying down of the constellation borders.[7]

10 Ursae Majoris is a spectroscopic binary—orbital motion from the two stars can be detected by Doppler shifts in their spectra. In this case, the two stars can also be split by differential astrometry. The primary has a mass of 1,44 M and the secondary, 0.89 M.[4] The primary is an F-type main-sequence star, and the secondary is K-type. The two orbit each other every 21.057 years along a slightly eccentric orbit.[6]


  1. ^ a b c d e f van Leeuwen, F.; et al. (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. ^ a b c d Oja, T. (1991). "UBV photometry of stars whose positions are accurately known. VI". Astronomy and Astrophysics Supplement Series. 89 (2): 415–419. Bibcode:1991A&AS...89..415O. 
  3. ^ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 18 June 2017. 
  4. ^ a b c Eggl, S.; Pilat-Lohinger, E.; Funk, B.; Georgakarakos, N.; Haghighipour, N. (2012). "Circumstellar habitable zones of binary-star systems in the solar neighbourhood". Monthly Notices of the Royal Astronomical Society. 428 (4): 3104. arXiv:1210.5411Freely accessible. Bibcode:2013MNRAS.428.3104E. doi:10.1093/mnras/sts257. 
  5. ^ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W. 
  6. ^ a b Muterspaugh, Matthew W.; Hartkopf, William I.; Lane, Benjamin F.; o'Connell, J.; Williamson, M.; Kulkarni, S. R.; Konacki, Maciej; Burke, Bernard F.; Colavita, M. M.; Shao, M.; Wiktorowicz, Sloane J. (2010). "The Phases Differential Astrometry Data Archive. Ii. Updated Binary Star Orbits and a Long Period Eclipsing Binary". The Astronomical Journal. 140 (6): 1623. arXiv:1010.4043Freely accessible. Bibcode:2010AJ....140.1623M. doi:10.1088/0004-6256/140/6/1623. 
  7. ^ Bagnall, Philip M. (2012). The Star Atlas Companion: What You Need to Know about the Constellations. New York, New York: Springer. p. 281. ISBN 1-4614-0830-X. 

External links[edit]

Kaler, James B. "10 UMA (10 Ursae Majoris) = HR 3579 Lyncis". Stars. University of Illinois. Retrieved 9 March 2016.