6 Lyncis

6 Lyncis is a star in the northern constellation of Lynx,[6] located approximately 179 light years from Earth.[1] It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.86.[2] This object is moving away from the Earth with a heliocentric radial velocity of +40 km/s.[2] It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.341 arc seconds per annum.[7]

6 Lyncis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lynx
Right ascension 06h 30m 47.1071s[1]
Declination +58° 09′ 45.481″[1]
Apparent magnitude (V) 5.86[2]
Characteristics
Spectral type K0.5 IIIb Fe0.5[3]
B−V color index 0.934±0.006[2]
Astrometry
Radial velocity (Rv)+39.57±0.20[2] km/s
Proper motion (μ) RA: −30.421±0.098[1] mas/yr
Dec.: −338.678±0.071[1] mas/yr
Parallax (π)18.2668 ± 0.0908[1] mas
Distance178.6 ± 0.9 ly
(54.7 ± 0.3 pc)
Absolute magnitude (MV)2.13[2]
Details[4]
Mass1.46±0.02 M☉
Radius5.2±0.1 R☉
Luminosity14.9±0.1 L☉
Surface gravity (log g)3.17±0.03 cgs
Temperature4,994±15 K
Metallicity [Fe/H]−0.18±0.04[2] dex
Rotational velocity (v sin i)1.8[5] km/s
Age2.8±0.2 Gyr
Other designations
6 Lyn, BD+58°932, GC 8416, HD 45410, HIP 31039, HR 2331, SAO 25771[6]
Database references
SIMBADdata
Exoplanet Archivedata

This is an aging giant star with a stellar classification of K0.5 IIIb Fe0.5,[3] which indicates it has a mild overabundance of iron in its spectrum. At the age of 2.8 billion years old, it has exhausted the hydrogen at its core, causing it to evolve away from the main sequence. As a consequence, it has expanded to 5.2 times the radius of the Sun although it only has 1.46 times the Sun's mass. The star is radiating 14.9 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,994 K.[4] One sub-stellar companion has been identified.[8]

Planetary system

In July 2008, the planet 6 Lyncis b was announced by Bun'ei Sato and collaborators from the Okayama Planet Search Program, along with 14 Andromedae b and 81 Ceti b. The planet was found to have minimum mass of 2.4 Jupiter masses and period of 899 days.[8]

The 6 Lyncis planetary system[9]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥2.010±0.077 MJ 2.11±0.11 934.3±8.6 0.073±0.036 — —

See also

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  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.
  3. Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
  4. Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951. S2CID 54555839.
  5. Massarotti, Alessandro; et al. (January 2008). "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity". The Astronomical Journal. 135 (1): 209–231. Bibcode:2008AJ....135..209M. doi:10.1088/0004-6256/135/1/209.
  6. "6 Lyn". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-05-27.
  7. Lépine, Sébastien; Shara, Michael M. (March 2005). "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)". The Astronomical Journal. 129 (3): 1483–1522. arXiv:astro-ph/0412070. Bibcode:2005AJ....129.1483L. doi:10.1086/427854. S2CID 2603568.
  8. Sato, Bun'ei; et al. (2008). "Planetary Companions to Evolved Intermediate-Mass Stars: 14 Andromedae, 81 Ceti, 6 Lyncis, and HD167042". Publications of the Astronomical Society of Japan. 60 (6): 1317–1326. arXiv:0807.0268. Bibcode:2008PASJ...60.1317S. doi:10.1093/pasj/60.6.1317. S2CID 67841762.
  9. Luhn, Jacob K.; et al. (2019). "Retired A Stars and Their Companions. VIII. 15 New Planetary Signals around Subgiants and Transit Parameters for California Planet Search Planets with Subgiant Hosts". The Astronomical Journal. 157 (4). 149. arXiv:1811.03043. Bibcode:2019AJ....157..149L. doi:10.3847/1538-3881/aaf5d0. S2CID 102486961.

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