Binary star system in the constellation of Cetus
79 Ceti Observation dataEpoch J2000.0 Equinox J2000.0 Constellation Cetus [ 1] A Right ascension 02h 35m 19.9292s [ 2] Declination −03° 33′ 38.173″[ 2] Apparent magnitude (V)+6.83[ 1] B Right ascension 02h 35m 19.8725s [ 3] Declination −03° 33′ 44.340″[ 3] Apparent magnitude (V)+14.4[ 4] Characteristics A Evolutionary stage subgiant [ 2] Spectral type G2V[ 5] [ 6] B−Vcolor index ± 0.004[ 1] B Evolutionary stage main sequence [ 7] Spectral type M2.5[ 7] Astrometry Radial velocity (Rv )± 0.09[ 1] km/s Absolute magnitude (MV )+3.88[ 1] A Proper motion (μ)RA: [ 2] mas /yr Dec.: [ 2] mas /yr Parallax (π)26.5057± 0.0271 mas [ 2] Distance 123.1 ± 0.1 ly pc ) B Proper motion (μ)RA: [ 3] mas /yr Dec.: [ 3] mas /yr Parallax (π)26.5223± 0.0353 mas [ 3] Distance 123.0 ± 0.2 ly pc ) Details 79 Ceti A Mass 1.01[ 8] M ☉ Radius 1.48[ 9] R ☉ Luminosity ± 0.04[ 8] L ☉ Surface gravity (log g )± 0.02[ 8] cgs Temperature ± 17[ 8] K Metallicity [Fe/H] ± 0.01[ 8] dex Rotational velocity (v sin i )1.9[ 7] Age 6.0[ 10] ± 0.8[ 1] Gyr 79 Ceti B Mass 0.286[ 6] M ☉ Radius +0.004 [ 3] R ☉ Luminosity +0.009 [ 3] L ☉ Surface gravity (log g )+0.02 [ 3] cgs Temperature +3 [ 3] K Other designations 79 Cet ,BD −04°426FK5 4237GJ 9085HD 16141HIP 12048SAO 129992WDS J02353-0334A2MASS J02351994-0333376Gaia DR2 2495335115182966016[ 11] Database references SIMBAD data B
79 Ceti , also known asHD 16141 , is abinary star system located 123 light-years from theSun in the southernconstellation ofCetus . It has anapparent visual magnitude of +6.83, which puts it below the normal limit for visibility with the average naked eye. The star is drifting closer to the Earth with a heliocentricradial velocity of −51 km/s.
Harlan (1974) assigned this star astellar classification of G2V,[ 5] G-type main-sequence star that is undergoingcore hydrogen fusion . However, Houk and Swift (1999) found a class of G8IV,[ 12] hydrogen at its core and begun toevolve off the main sequence. Eventually the outer layers of the star will expand and cool and the star will become ared giant . Estimates of the star's age range from 6.0[ 10] [ 1] mass of the Sun and 1.48 times theSun's radius .[ 9] [ 8] luminosity of the Sun from itsphotosphere at aneffective temperature ofK [ 8]
Ared dwarf companion at a projected separation of 220AU was discovered in 2005.[ 13] [ 4]
On March 29, 2000, a planet orbiting primary star was announced, it was discovered using theradial velocity method .[ 14] Jupiter and is orbiting its host star every 75.5 days.[ 15]
^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 . XHIP record for this object atVizieR .^a b c d e f 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 atVizieR .^a b c d e f g h i 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 atVizieR .^a b Tokovinin, Andrei (2018)."The Updated Multiple Star Catalog" .The Astrophysical Journal Supplement Series .235 (1): 6.arXiv :1712.04750 Bibcode :2018ApJS..235....6T .doi :10.3847/1538-4365/aaa1a5 ^a b Harlan, E. A. (June 1974). "MK classification for F- and G-type stars. III".Astronomical Journal .79 :682– 686.Bibcode :1974AJ.....79..682H .doi :10.1086/111597 . ^a b Quarles, Billy; Li, Gongjie; Kostov, Veselin; Haghighipour, Nader (2020)."Orbital Stability of Circumstellar Planets in Binary Systems" .The Astronomical Journal .159 (3): 80.arXiv :1912.11019 Bibcode :2020AJ....159...80Q .doi :10.3847/1538-3881/ab64fa S2CID 209444271 . ^a b c Lindgren, Sara; Heiter, Ulrike; Seifahrt, Andreas (2016). "Metallicity determination of M dwarfs. High-resolution infrared spectroscopy".Astronomy and Astrophysics .586 .arXiv :1510.06642 Bibcode :2016A&A...586A.100L .doi :10.1051/0004-6361/201526602 . ^a b c d e f g S. G., Sousa; et al. (August 2008). "Spectroscopic parameters for 451 stars in the HARPS GTO planet search program. Stellar [Fe/H] and the frequency of exo-Neptunes".Astronomy and Astrophysics .487 (1):373– 381.arXiv :0805.4826 Bibcode :2008A&A...487..373S .doi :10.1051/0004-6361:200809698 .S2CID 18173201 . ^a b Stassun, Keivan G.; et al. (March 2017)."Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes" .The Astronomical Journal .153 (3): 20.arXiv :1609.04389 Bibcode :2017AJ....153..136S .doi :10.3847/1538-3881/aa5df3 S2CID 119219062 . 136. ^a b Sousa, S. G.; et al. (March 2010). "Higher depletion of lithium in planet host stars: no age and mass effect".Astronomy and Astrophysics .512 : L5.arXiv :1003.0405 Bibcode :2010A&A...512L...5S .doi :10.1051/0004-6361/201014125 .S2CID 118646949 . ^ "79 Cet" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved19 August 2017 .^ Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars".Michigan Spectral Survey .5 .Bibcode :1999MSS...C05....0H . ^ Mugrauer, M.; Neuhäuser, R.; Seifahrt, A.; Mazeh, T.; Guenther, E. (2005). "Four new wide binaries among exoplanet host stars".Astronomy and Astrophysics .440 (3): 1051.arXiv :astro-ph/0507101 Bibcode :2005A&A...440.1051M .doi :10.1051/0004-6361:20042297 . ^ "Keck astronomers discover planets smaller than saturn" (Press release). Kamuela, Hawaii: W. M. Keck Observatory. March 29, 2000. RetrievedAugust 13, 2019 .^ Marcy, Geoffrey W.; et al. (2000). "Sub-Saturn Planetary Candidates of HD 16141 and HD 46375".The Astrophysical Journal Letters .536 (1):L43– L46.arXiv :astro-ph/0004326 Bibcode :2000ApJ...536L..43M .doi :10.1086/312723 .PMID 10849416 .S2CID 119530785 . ^ Butler, J. T.; et al. (2006). "Catalog of Nearby Exoplanets".The Astrophysical Journal .646 (1):505– 522.arXiv :astro-ph/0607493 Bibcode :2006ApJ...646..505B .doi :10.1086/504701 .S2CID 119067572 .
