12 Lyncis

12 Lyn
Observation data; Epoch J2000 Equinox J2000
Constellation	Lynx
Right ascension	06h 46m 14.13019s
Declination	+59° 26′ 30.0227″
Apparent magnitude (V)	4.86 (5.44 / 6.00)
Characteristics
Spectral type	A3V (A1.5V + A2V)
U−B color index	+0.08
B−V color index	+0.084±0.012
Astrometry
Radial velocity (Rv)	−3.0±4.2 km/s
Proper motion (μ)	RA: −19.63 mas/yr ; Dec.: −7.23 mas/yr
Parallax (π)	15.19±0.78 mas
Distance	210 ± 10 ly ; (66 ± 3 pc)
Absolute magnitude (MV)	0.77
Orbit
Period (P)	907.6 yr
Semi-major axis (a)	2.30″
Eccentricity (e)	0.3700
Inclination (i)	134.7°
Longitude of the node (Ω)	166.5°
Periastron epoch (T)	B 2677.4
Argument of periastron (ω); (secondary)	322.6°
Details
12 Lyn A
Radius	2.52 R☉
Rotational velocity (v sin i)	90±30 km/s
12 Lyn B
Radius	2.44 R☉
Rotational velocity (v sin i)	100±30 km/s
Other designations
	12 Lyn, BD+59°1015, GC 9850, HD 48250, HIP 32438, HR 2470, SAO 25939, WDS 06462+5927
Database references
SIMBAD	12 Lyn
	12 Lyn A
	12 Lyn B

12 Lyncis, abbreviated 12 Lyn, is a triple star^[8] system in the constellation Lynx. It is visible to the naked eye as a faint point of light with a combined apparent visual magnitude of 4.87. When seen through a telescope, it can be separated into three stars: two components with magnitudes 5.4 and 6.0 that lie at an angular separation by 1.8″ (as of 1992) and a yellow-hued star of magnitude 7.2 at a separation of 8.6″ (as of 1990).^[9]^[10] The orbit of the two brighter stars is not known with certainty, but appears to have a period of somewhere around 700 to 900 years.^[11] The pair have a projected separation of 128 AU.^[4] Parallax indicates the system is 210±10 light years distant from Earth.^[1]

References

^ ^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. Archived from the original on 2016-04-02.
^ ^a ^b ^c ^d 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, S2CID 119257644.
^ ^a ^b "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 28 May 2017.
^ ^a ^b ^c ^d ^e ^f Howe, K. S.; Clarke, C. J. (January 2009). "An analysis of v sin (i) correlations in early-type binaries". Monthly Notices of the Royal Astronomical Society. 392 (1): 448–454. Bibcode:2009MNRAS.392..448H. doi:10.1111/j.1365-2966.2008.14073.x.
^ Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
^ "* 12 Lyn". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 November 2012.
^ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
^ Mason, Brian D.; et al. (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.
^ Monks, Neale (2010). Go-To Telescopes Under Suburban Skies. New York, New York: Springer Science & Business Media. p. 56. ISBN 9781441968517.
^ Malkov, O. Yu.; Tamazian, V.S.; Docobo, J.A.; Chulkov, D.A. (2012). "Dynamical Masses of a Selected Sample of Orbital Binaries". Astronomy and Astrophysics. 546: 5. Bibcode:2012A&A...546A..69M. doi:10.1051/0004-6361/201219774. A69.

[HIP-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:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600. Archived from the original on 2016-04-02.

[Anderson2012-2] 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, S2CID 119257644.

[ORB6-3] "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 28 May 2017.

[Howe2009-4] ^ ^a ^b ^c ^d ^e ^f Howe, K. S.; Clarke, C. J. (January 2009). "An analysis of v sin (i) correlations in early-type binaries". Monthly Notices of the Royal Astronomical Society. 392 (1): 448–454. Bibcode:2009MNRAS.392..448H. doi:10.1111/j.1365-2966.2008.14073.x.

[Johnson-5] Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.

[Gontcharov-6] Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.

[SIMBAD-7] "* 12 Lyn". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 November 2012.

[Eggleton2008-8] Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.

[wds2001-9] Mason, Brian D.; et al. (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.

[10] Monks, Neale (2010). Go-To Telescopes Under Suburban Skies. New York, New York: Springer Science & Business Media. p. 56. ISBN 9781441968517.

[malkov-11] Malkov, O. Yu.; Tamazian, V.S.; Docobo, J.A.; Chulkov, D.A. (2012). "Dynamical Masses of a Selected Sample of Orbital Binaries". Astronomy and Astrophysics. 546: 5. Bibcode:2012A&A...546A..69M. doi:10.1051/0004-6361/201219774. A69.

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Observation data Epoch J2000 Equinox J2000
Constellation	Lynx
Right ascension	06^h 46^m 14.13019^s^[1]
Declination	+59° 26′ 30.0227″^[1]
Apparent magnitude (V)	4.86^[2] (5.44 / 6.00)^[3]
Characteristics
Spectral type	A3V^[2] (A1.5V + A2V)^[4]
U−B color index	+0.08^[5]
B−V color index	+0.084±0.012^[2]
Astrometry

Radial velocity (R_v)	−3.0±4.2^[6] km/s
Proper motion (μ)	RA: −19.63^[1] mas/yr Dec.: −7.23^[1] mas/yr
Parallax (π)	15.19±0.78 mas^[1]
Distance	210 ± 10 ly (66 ± 3 pc)
Absolute magnitude (M_V)	0.77^[2]

Orbit^[3]
Period (P)	907.6 yr
Semi-major axis (a)	2.30″
Eccentricity (e)	0.3700
Inclination (i)	134.7°
Longitude of the node (Ω)	166.5°
Periastron epoch (T)	B 2677.4
Argument of periastron (ω) (secondary)	322.6°
Details
12 Lyn A
Radius	2.52^[4] `R`_☉
Rotational velocity (v sin i)	90±30^[4] km/s
12 Lyn B
Radius	2.44^[4] `R`_☉
Rotational velocity (v sin i)	100±30^[4] km/s
Other designations
12 Lyn, BD+59°1015, GC 9850, HD 48250, HIP 32438, HR 2470, SAO 25939, WDS 06462+5927^[7]
Database references
SIMBAD	12 Lyn
	12 Lyn A
	12 Lyn B

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