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HD 72659
Star in the constellation of Hydra From Wikipedia, the free encyclopedia
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HD 72659 is a star in the equatorial constellation of Hydra. With an apparent visual magnitude of 7.46,[2] its yellow-hued star is too faint to be viewed with the naked eye. Parallax measurements provide a distance estimate of 169.4 light years from the Sun, and it has an absolute magnitude of 3.98.[2] The star is drifting closer with a radial velocity of −18.2 km/s.[4]
This is a Sun-like main sequence star with a stellar classification of G2V,[3] indicating that it is generating energy through core hydrogen fusion. It is older than the Sun with an age of about seven billion years,[5] and is spinning with a projected rotational velocity of 5.1 km/s.[7] The star has 7% greater mass than the Sun and a 38% larger radius. It is radiating more than double the Sun's luminosity from its photosphere at an effective temperature of 5,956 K.[5] The metallicity of the stellar atmosphere is similar to the Sun.[2]
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Planetary system
An extrasolar planet was discovered orbiting this star in 2003 via the Doppler method.[8] This is a superjovian planet with an eccentric orbit, completing a lap around its host star every 9.9 years.[9] In 2022, the inclination and true mass of HD 72659 b were measured via astrometry, along with the detection of a second substellar companion, likely a brown dwarf.[10] The orbit of the brown dwarf lies in the so-called brown dwarf desert, regions with a deficit of brown dwarfs. The host star is very old and thus HD 72659 b and c can not be directly imaged, even with the most modern equipment such as the James Webb Space Telescope. The moderate eccentricity of planet b may be the result of Kozai-Lidov oscillations.[4]
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See also
References
External links
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