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]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lynx |
| Right ascension | 06h 46m 14.13019s[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 (Rv) | −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 (MV) | 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 | |
| Database references | |
| SIMBAD | 12 Lyn |
| 12 Lyn A | |
| 12 Lyn B | |
References
edit- ^ 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.