79 Ceti

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79 Ceti
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Cetus
Right ascension 02h 35m 19.9293s [1]
Declination −03° 33′ 38.1707″ [1]
Apparent magnitude  (V)+6.83 [2]
Characteristics
Spectral type G2V+M [3] [4] or G8IV [5]
B−V color index 0.670±0.004 [2]
Variable type none
Astrometry
Radial velocity (Rv)−50.93±0.09 [2]  km/s
Proper motion (μ)RA: −155.58 [1]   mas/yr
Dec.: −437.99 [1]   mas/yr
Parallax (π)26.4360 ± 0.0580  mas [1]
Distance 123.4 ± 0.3  ly
(37.83 ± 0.08  pc)
Absolute magnitude  (MV)+3.88 [2]
Details [6]
79 Ceti A
Mass 1.01  M☉
Radius 1.48 [7]   R☉
Luminosity 1.99±0.04  L☉
Surface gravity (log g)4.19±0.02  cgs
Temperature 5,806±17  K
Metallicity [Fe/H]+0.16±0.01 [6]   dex
Age 6.0 [8] or 9.4±0.8 [2]   Gyr
79 Ceti B
Mass 0.286 [4]   M☉
Other designations
79 Cet, BD−04°426, FK5  4237, Gaia DR2  2495335115182966016, GJ  9085, HD  16141, HIP  12048, SAO  129992, WDS J02353-0334A, 2MASS J02351994-0333376 [9]
Database references
SIMBAD data

79 Ceti, also known as HD 16141, is a binary star system located 123 [1]   light-years from the Sun in the southern constellation of Cetus. It has an apparent visual magnitude of +6.83, [2] which puts it below the normal limit for visibility with the average naked eye. The star is drifting closer to the Earth with a heliocentric radial velocity of −51 km/s. [2]

Contents

Harlan (1974) assigned this star a stellar classification of G2V, [3] matching an ordinary G-type main-sequence star that is undergoing core hydrogen fusion. However, Houk and Swift (1999) found a class of G8IV, [5] which suggests it has exhausted the supply of hydrogen at its core and begun to evolve off the main sequence. Eventually the outer layers of the star will expand and cool and the star will become a red giant. Estimates of the star's age range from 6.0 [8] to 9.4 billion years old. It has an estimated 1.06 times the mass of the Sun and 1.48 [7] times the Sun's radius. The star is radiating twice [6] luminosity of the Sun from its photosphere at an effective temperature of 5,806 K. [6] The discrepancy was later found to be due to an additional red dwarf star in the system at a projected separation 220 AUs. [4]

Planetary system

On March 29, 2000, a planet orbiting primary star was announced, it was discovered using the radial velocity method. [10] This object has a minimum 0.26 times the mass of Jupiter and is orbiting its host star every 75.5 days. [11]

The 79 Ceti planetary system [12]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥0.260 ± 0.028  MJ 0.363 ± 0.02175.523 ± 0.0550.252 ± 0.052——

See also

Related Research Articles

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HD 224693, also named Axólotl, is a star in the equatorial constellation of Cetus, and is positioned near the western constellation border with Aquarius. It can be viewed with a small telescope but is too faint to be seen with the naked eye, having an apparent visual magnitude of 8.23. Based on parallax measurements, the object is located at a distance of approximately 306 light years from the Sun. It is drifting further away with a radial velocity of 1.5 km/s.

HD 11964 is a binary star system located 110 light-years away from the Sun in the equatorial constellation of Cetus. It is visible in binoculars or a telescope but is too faint to be seen with the naked eye, having an apparent visual magnitude of 7.51. The system is drifting closer to the Sun with a radial velocity of −9 km/s. Two extrasolar planets have been confirmed to orbit the primary.

<span class="mw-page-title-main">HD 70573</span> Star in the constellation Hydra

HD 70573 is a variable star in the equatorial constellation of Hydra. At a mean apparent visual magnitude of +8.7, this yellow-hued star is too dim to be visible to the naked eye. Based upon parallax measurements, it is located at a distance of 193 light years from the Sun, and is drifting further away with a radial velocity of 20.5 km/s. It is a candidate member of the proposed Hercules-Lyra Association of co-moving stars, although this membership is disputed.

<span class="mw-page-title-main">HD 136118</span> Star in the constellation Serpens

HD 136118 is a star in the Serpens Caput section of the Serpens constellation. The star is too dim to be readily visible to the naked eye, having an apparent visual magnitude of 6.93. It is located at a distance of 165 light years from the Sun based on parallax, and is drifting closer with a radial velocity of −3 km/s.

HD 222582 is a multiple star system in the equatorial constellation of Aquarius. It is invisible to the naked eye with an apparent visual magnitude of 7.7, but can be viewed with binoculars or a small telescope. The system is located at a distance of 138 light years from the Sun based on parallax, and it is drifting further away with a radial velocity of +12 km/s. It is located close enough to the ecliptic that it is subject to lunar occultations.

HD 196050 is a triple star system located in the southern constellation of Pavo. This system has an apparent magnitude of 7.50 and the absolute magnitude is 4.01. It is located at a distance of 165 light-years from the Sun based on parallax, and is drifting further away with a radial velocity of +61 km/s. It is also called by the Hipparcos designation HIP 101806.

81 Ceti is a star located approximately 331 light years away from the Sun in the equatorial constellation of Cetus. 81 Ceti is the Flamsteed designation for this object. It is visible to the naked eye as a dim, yellow-hued point of light with an apparent visual magnitude of 5.65. The star is drifting further away from the Earth with a heliocentric radial velocity of +9 km/s.

HD 30562 is a star in the equatorial constellation of Eridanus. It has a golden hue and can be viewed with the naked eye under good seeing conditions, having an apparent visual magnitude of 5.77. The distance to this star is 85 light years based on parallax. It is drifting further away with a high radial velocity of +77 km/s, having come to within 46.8 light-years some 236,000 years ago.

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<span class="mw-page-title-main">Chi Ceti</span> Double star in the constellation Cetus

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<span class="mw-page-title-main">HD 114613</span> Star in the constellation Centaurus

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HD 63399 is an orange hued star located in the southern constellation Puppis, the poop deck. It has an apparent magnitude of 6.45, placing it near the limit for naked eye visibility. Based on parallax measurements from Gaia DR3, the object is estimated to be 445 light years distant. It appears to be receding with a spectroscopic radial velocity of 28.5 km/s. At its current distance, HD 63399 is diminished by 0.29 magnitudes due to interstellar dust.

<span class="mw-page-title-main">9 Ceti</span> Star in the constellation Cetus

9 Ceti is a star in the equatorial constellation of Cetus. It has the variable star designation BE Ceti, while 9 Ceti is the Flamsteed designation. It has an apparent visual magnitude of 6.4, which is below the limit that can be seen with the naked eye by a typical observer. Based upon parallax measurements, this star is 69.6 light years away from the Sun.

HD 212771, also named Lionrock, is a solitary star in the southern zodiac constellation Aquarius. It has an apparent magnitude of 7.60, making it readily visible with binoculars but not the naked eye. Parallax measurements place the object at a distance of 364 light years, and is currently receding with a radial velocity of 15 km/s.

HD 72945 and HD 72946 form a co-moving star system in the northern constellation of Cancer. HD 72945 is a binary star that is dimly visible to the naked eye as a point of light with an apparent visual magnitude of 5.91. At an angular separation of 10.10″ is the fainter companion star HD 72946 at magnitude 7.25. It is being orbited by a brown dwarf. The system as a whole is located at a distance of approximately 84 light years from the Sun based on parallax measurements.

References

  1. 1 2 3 4 5 6 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. 1 2 3 4 5 6 7 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. 1 2 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.
  4. 1 2 3 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
  5. 1 2 Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
  6. 1 2 3 4 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.
  7. 1 2 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.
  8. 1 2 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.
  9. ↑ "79 Cet". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 19 August 2017.
  10. ↑ "Keck astronomers discover planets smaller than saturn" (Press release). Kamuela, Hawaii: W. M. Keck Observatory. March 29, 2000. Retrieved August 13, 2019.
  11. ↑ 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.
  12. ↑ 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.
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