HD 181720 b

HD 181720 b is an extrasolar planet which orbits the G-type main sequence star HD 181720, located approximately 190 light years away in the constellation Sagittarius. This planet has at least three-eighths the mass of Jupiter and takes over two and five-eighths years to orbit the star at a semimajor axis of 1.78 AU with an eccentricity of 0.26.[1] This planet was detected by HARPS on October 19, 2009, together with 29 other planets.

HD 181720 b / Toge
Discovery
Discovered bySantos et al.
Discovery siteLa Silla Observatory
Discovery dateOctober 19, 2009
radial velocity (HARPS)
Orbital characteristics
Apastron2.24 AU (335,000,000 km)
Periastron1.31 AU (196,000,000 km)
1.78 AU (266,000,000 km)[1]
Eccentricity0.26 ± 0.06[1]
956 ± 14[1] d
2.62 y
20.3
2,453,631 ± 30[1]
177 ± 12[1]
Semi-amplitude8.4 ± 0.4[1]
StarHD 181720

    The planet HD 181720 b is named Toge. The name was selected in the NameExoWorlds campaign by Ghana, during the 100th anniversary of the IAU. Toge means earring in the Ewe language.[2][3]

    See also

    References

    1. Santos, Nuno C.; Mayor, Michel; Benz, Willy; Bouchy, François; et al. (2010). "The HARPS Search for Southern Extra-solar Planets XXI. Three New Giant Planets Orbiting the Metal-poor Stars HD 5388, HD 181720, and HD 190984". Astronomy and Astrophysics. 512 (A47): A47. arXiv:0912.3216. Bibcode:2010A&A...512A..47S. doi:10.1051/0004-6361/200913489. S2CID 118675798.
    2. "Approved names". NameExoworlds. Retrieved 2020-01-02.
    3. "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.


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