10 Ursae Majoris

10 Ursae Majoris
	Location of 10 UMa (circled in red)
Observation data; Epoch J2000 Equinox J2000
Constellation	Lynx
Right ascension	09h 00m 38.38067s
Declination	+41° 46′ 58.6051″
Apparent magnitude (V)	3.960 (4.18 / 6.48)
Characteristics
Spectral type	F3V + K0V
U−B color index	+0.04
B−V color index	+0.43
Astrometry
Radial velocity (Rv)	26.4 ± 0.9 km/s
Proper motion (μ)	RA: -474.31 mas/yr ; Dec.: -204.21 mas/yr
Parallax (π)	62.23±0.68 mas
Distance	52.4 ± 0.6 ly ; (16.1 ± 0.2 pc)
Absolute magnitude (MV)	+2.93
Orbit
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
10 UMa A
Mass	1.44 M☉
Radius	1.518 R☉
Luminosity	4.285 L☉
Temperature	6740 K
10 UMa B
Mass	0.89 M☉
Radius	0.965 R☉
Luminosity	0.638 L☉
Temperature	5250 K
Other designations
	10 UMa, BD+42°1956, FK5 339, GJ 332, HD 76943, HIP 44248, HR 3579, SAO 42642
Database references
SIMBAD	10 UMa
ARICNS	10 UMa A
	10 UMa B

10 Ursae Majoris is a binary star system in the northern constellation of Lynx. It is visible to the naked eye as a faint star with a combined apparent visual magnitude of 3.960.^[3] This system is fairly close to the Sun, at 53 light-years (16.1 pc) away from Earth.^[2] It is the third-brightest object in Lynx. John Flamsteed, England’s first Astronomer Royal, wrongly catalogued this star as part of Ursa Major, hence its designation.^[9] The system is moving further from the Earth with a heliocentric radial velocity of 26.4 km/s.^[6] It is a probable member of the Hyades supercluster.^[10]

This 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 magnitude 4.18^[4] primary has a mass of 1.44 M_☉ and the fainter secondary, 0.89 M_☉.^[5] The primary is an F-type main-sequence star radiating 4.3 times the Sun's luminosity, and the magnitude 6.48^[4] secondary is K-type with 0.6 times the luminosity of the Sun. The two orbit each other every 21.057 years with an eccentricity of 0.15.^[7]

Notes

^ ^a ^b Calculated, using the Stefan-Boltzmann law and the star's effective temperature and luminosity, with respect to the solar nominal effective temperature of 5,772 K: ${\sqrt {{\biggl (}{\frac {5,772}{6,740}}{\biggr )}^{4}\cdot 4.285}}=1.518\ R_{\odot }.$ ${\sqrt {{\biggl (}{\frac {5,772}{5,250}}{\biggr )}^{4}\cdot 0.638}}=0.965\ R_{\odot }.$

References

^ ^a ^b Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
^ ^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:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
^ ^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.
^ ^a ^b ^c "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 18 June 2017.
^ ^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:1210.5411. Bibcode:2013MNRAS.428.3104E. doi:10.1093/mnras/sts257. S2CID 73534476.
^ ^a ^b Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.
^ ^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:1010.4043. Bibcode:2010AJ....140.1623M. doi:10.1088/0004-6256/140/6/1623. S2CID 6030289.
^ "10 UMa". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved April 27, 2019.
^ Ridpath, Ian. "Star Tales (online edition)".
^ Eggen, O. J. (June 1984). "A Systematic Search for Members of the Hyades Supercluster - Part Two - the Visual Binaries". Astronomical Journal. 89:6 (1541): 839. Bibcode:1984AJ.....89..839E. doi:10.1086/113579.

External links

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

[rad-8] Calculated, using the Stefan-Boltzmann law and the star's effective temperature and luminosity, with respect to the solar nominal effective temperature of 5,772 K: ${\sqrt {{\biggl (}{\frac {5,772}{6,740}}{\biggr )}^{4}\cdot 4.285}}=1.518\ R_{\odot }.$ ${\sqrt {{\biggl (}{\frac {5,772}{5,250}}{\biggr )}^{4}\cdot 0.638}}=0.965\ R_{\odot }.$

[xhip-1] Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.

[HIP-2] ^ ^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:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.

[Oja-3] 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.

[ORB6-4] "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 18 June 2017.

[Eggl-5] 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. S2CID 73534476.

[GCRV-6] Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.

[Muterspaugh-7] 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. S2CID 6030289.

[SIMBAD-9] "10 UMa". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved April 27, 2019.

[ridpath-10] Ridpath, Ian. "Star Tales (online edition)".

[Eggen1984-11] Eggen, O. J. (June 1984). "A Systematic Search for Members of the Hyades Supercluster - Part Two - the Visual Binaries". Astronomical Journal. 89:6 (1541): 839. Bibcode:1984AJ.....89..839E. doi:10.1086/113579.

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Observation data Epoch J2000 Equinox J2000
Location of 10 UMa (circled in red)
Constellation	Lynx^[1]
Right ascension	09^h 00^m 38.38067^s^[2]
Declination	+41° 46′ 58.6051″^[2]
Apparent magnitude (V)	3.960^[3] (4.18 / 6.48)^[4]
Characteristics
Spectral type	F3V + K0V^[5]
U−B color index	+0.04^[3]
B−V color index	+0.43^[3]
Astrometry

Radial velocity (R_v)	26.4 ± 0.9^[6] km/s
Proper motion (μ)	RA: -474.31^[2] mas/yr Dec.: -204.21^[2] mas/yr
Parallax (π)	62.23±0.68 mas^[2]
Distance	52.4 ± 0.6 ly (16.1 ± 0.2 pc)
Absolute magnitude (M_V)	+2.93^[1]

Orbit^[7]
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^[5]
10 UMa A
Mass	1.44 `M`_☉
Radius	1.518^[a] `R`_☉
Luminosity	4.285 `L`_☉
Temperature	6740 K
10 UMa B
Mass	0.89 `M`_☉
Radius	0.965^[a] `R`_☉
Luminosity	0.638 `L`_☉
Temperature	5250 K
Other designations
10 UMa, BD+42°1956, FK5 339, GJ 332, HD 76943, HIP 44248, HR 3579, SAO 42642^[8]
Database references
SIMBAD	10 UMa
ARICNS	10 UMa A
	10 UMa B

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