6 Lyncis
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lynx |
| Right ascension | 06h 30m 47.10759s[1] |
| Declination | +58° 09′ 45.4798″[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: −30.691 mas/yr[1] Dec.: −338.612 mas/yr[1] |
| Parallax (π) | 18.2183 ± 0.0486 mas[1] |
| Distance | 179.0 ± 0.5 ly (54.9 ± 0.1 pc) |
| Absolute magnitude (MV) | 2.13[2] |
| Details | |
| Mass | 1.37±0.14[4] M☉ |
| Radius | 5.12±0.16[5] R☉ |
| Luminosity | 14.2±0.9[5] L☉ |
| Surface gravity (log g) | 3.17±0.03[6] cgs |
| Temperature | 4,949±58[5] K |
| Metallicity [Fe/H] | −0.18±0.04[2] dex |
| Rotational velocity (v sin i) | 1.8[7] km/s |
| Age | 2.8±0.2[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
6 Lyncis is a star in the northern constellation of Lynx,[8] 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.[9] One exoplanet is known to orbit it.[10]
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 2.8 billion years old,[6] it has exhausted the hydrogen at its core, causing it to evolve away from the main sequence. As a consequence, it has expanded to 5.12 times the radius of the Sun[5] although it only has 1.37 times the Sun's mass.[4] The star is radiating 14.2 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,950 K.[6]
Planetary system
[edit]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.[10]
| 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
[edit]References
[edit]- ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d e f g 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 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.
- ^ a b Malla, Sai Prathyusha; Stello, Dennis; Huber, Daniel; Montet, Benjamin T; Bedding, Timothy R; Fredslund Andersen, Mads; Grundahl, Frank; Jessen-Hansen, Jens; Hey, Daniel R; Palle, Pere L; Deng, Licai; Zhang, Chunguang; Chen, Xiaodian; Lloyd, James; Antoci, Victoria (2020-08-21). "Asteroseismic masses of four evolved planet-hosting stars using SONG and TESS: resolving the retired A-star mass controversy". Monthly Notices of the Royal Astronomical Society. 496 (4): 5423–5435. arXiv:2006.07649. doi:10.1093/mnras/staa1793. ISSN 0035-8711.
- ^ a b c d White, T R; Huber, D; Mann, A W; Casagrande, L; Grunblatt, S K; Justesen, A B; Silva Aguirre, V; Bedding, T R; Ireland, M J; Schaefer, G H; Tuthill, P G (2018-07-11). "Interferometric diameters of five evolved intermediate-mass planet-hosting stars measured with PAVO at the CHARA Array". Monthly Notices of the Royal Astronomical Society. 477 (4): 4403–4413. arXiv:1804.05976. doi:10.1093/mnras/sty898. ISSN 0035-8711.
- ^ a b c d 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.
- ^ 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.
- ^ a b "6 Lyn". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-05-27.
- ^ 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.
- ^ a b 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.
- ^ 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.
External links
[edit]- Jean Schneider (2011). "Notes for star 6 Lyn". Extrasolar Planets Encyclopaedia. Archived from the original on August 3, 2008. Retrieved 8 October 2011.
