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WASP-71
F-class main sequence star in the constellation Cetus From Wikipedia, the free encyclopedia
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WASP-71, also named Mpingo, is an ordinary star with a close-orbiting planetary companion in the equatorial constellation of Cetus. With an apparent visual magnitude of 10.56,[3] it is too faint to be visible to the naked eye. This star is located at a distance of 1,160 light-years based on parallax measurements, and is drifting further away with a heliocentric radial velocity of 7.7 km/s.[5]
This is classified as an F-type star with a stellar classification of F8.[4] It is more than double the diameter of the Sun with 1.5 times the Sun's mass. The star is younger than the Sun at about 3.6 billion years,[6] yet is already evolving away from the main sequence.[4] BD+00 316 is enriched in heavy elements, having 140% of the solar abundance of iron.[6] Imaging surveys in 2015 and 2020 failed to find any stellar companions for BD+00 316.[8][9]
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Nomenclature
The designation WASP-71 comes from the Wide Angle Search for Planets and has been used since 2012;[4] BD+00 316 is the stellar identifier from the Bonner Durchmusterung catalogue.[7]
The star was named Mpingo by Tanzanian amateur astronomers in 2020 as part of the NameExoWorlds contest, after the mpingo tree (Dalbergia melanoxylon) whose wood is a type of ebony used in musical instruments.[10]
Planetary system
In 2012 a transiting superjovian planet, designated WASP-71b, was detected on a tight, circular orbit.[4] The planetary orbit is well aligned with the equatorial plane of the star, the misalignment angle being equal to −1.9+7.1
−7.5°.[6] Its equilibrium temperature is 2,016.1+67.0
−52.5 K.[6]
The planet was named Tanzanite by Tanzanian amateur astronomers in 2020 as part of the NameExoWorlds contest, after the mineral also known as tanzanite.[10]
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References
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