Star in the constellation Sculptor
HD 4208 is a star with an orbiting exoplanetary companion in the southern constellation of Sculptor . It has a yellow hue with an apparent visual magnitude of 7.78,[ 2] making it too dim to be visible to the naked eye. But with binoculars or small telescope it should be an easy target. This object is located at a distance of 111.6 light years from the Sun based on parallax , and is drifting further away with a radial velocity of +57 km/s.[ 2]
The star HD 4208 is named Cocibolca . The name was selected in the NameExoWorlds campaign by Nicaragua , during the 100th anniversary of the IAU . Cocibolca is the Nahuatl name for the Lake Nicaragua .[ 8] [ 9]
This is a G-type main-sequence star with a stellar classification of G7V Fe-1 CH-0.5 ,[ 3] where the suffix notation indicates underabundances of iron and carbyne in the spectrum . It is roughly 6.6[ 5] billion years old and is spinning with a projected rotational velocity of 4.4 km/s.[ 6] The star has 86% of the Sun's mass and radius, and is radiating 71% of the Sun's luminosity from its photosphere at an effective temperature of 5,717 K.[ 5]
In 2001, a planet was discovered orbiting the star by means of the radial velocity method .[ 10] This body is orbiting 1.66 AU from the host star with a period of 2.28 years and a low eccentricity of 0.042.[ 4] The position of this planet near the star's habitable zone means that it will have a strong gravitational perturbation effect on any potential Earth-mass planet that may be orbiting within this region.[ 11]
See also
References
^ a b c d e 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 .
^ a b c d e f 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 Gray, R. O.; et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal . 132 (1): 161–170. arXiv :astro-ph/0603770 . Bibcode :2006AJ....132..161G . doi :10.1086/504637 . S2CID 119476992 .
^ a b c d Barbato, D.; et al. (August 2018). "Exploring the realm of scaled solar system analogues with HARPS". Astronomy & Astrophysics . 615 : 21. arXiv :1804.08329 . Bibcode :2018A&A...615A.175B . doi :10.1051/0004-6361/201832791 . S2CID 119099721 . A175.
^ 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 .
^ a b Luck, R. Earle (January 2017), "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants", The Astronomical Journal , 153 (1): 19, arXiv :1611.02897 , Bibcode :2017AJ....153...21L , doi :10.3847/1538-3881/153/1/21 , S2CID 119511744 , 21.
^ "HD 4208" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-11-05 .
^ "Approved names" . NameExoworlds . Retrieved 2020-01-02 .
^ "International Astronomical Union | IAU" . www.iau.org . Retrieved 2020-01-02 .
^ Vogt, Steven S.; et al. (2002). "Ten Low-Mass Companions from the Keck Precision Velocity Survey". The Astrophysical Journal . 568 (1): 352–362. arXiv :astro-ph/0110378 . Bibcode :2002ApJ...568..352V . doi :10.1086/338768 . S2CID 2272917 .
^ Hinse, T. C.; et al. (September 2008). "Dynamics and stability of telluric planets within the habitable zone of extrasolar planetary systems. Numerical simulations of test particles within the HD 4208 and HD 70642 systems" . Astronomy and Astrophysics . 488 (3): 1133–1147. Bibcode :2008A&A...488.1133H . doi :10.1051/0004-6361:200809822 .