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] |
| Characteristics | |
| Spectral type | F3V + K0V[4] |
| U−B color index | +0.04[2] |
| B−V color index | +0.43[2] |
| Astrometry | |
| 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 |
| Distance | 52.4 ± 0.6 ly (16.1 ± 0.2 pc) |
| Orbit[6] | |
| 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) (secondary) | 32.30 ± 0.44° |
| Details[4] | |
| 10 UMa A | |
| Mass | 1.44 M☉ |
| Luminosity | 4.285 L☉ |
| Temperature | 6740 K |
| 10 UMa B | |
| Mass | 0.89 M☉ |
| Luminosity | 0.638 L☉ |
| Temperature | 5250 K |
| Other designations | |
| Database references | |
| SIMBAD | 10 UMa |
| ARICNS | 10 UMa A |
| 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]
References
- 1 2 3 4 5 6 van Leeuwen, F.; et al. (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.
- 1 2 3 4 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.
- ↑ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 18 June 2017.
- 1 2 3 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:1210.5411. Bibcode:2013MNRAS.428.3104E. doi:10.1093/mnras/sts257.
- ↑ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.
- 1 2 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:1010.4043. Bibcode:2010AJ....140.1623M. doi:10.1088/0004-6256/140/6/1623.
- ↑ 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
Kaler, James B. "10 UMA (10 Ursae Majoris) = HR 3579 Lyncis". Stars. University of Illinois. Retrieved 9 March 2016.