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.
| Discovery | |
|---|---|
| Discovered by | Santos et al. |
| Discovery site | La Silla Observatory |
| Discovery date | October 19, 2009 |
| radial velocity (HARPS) | |
| Orbital characteristics | |
| Apastron | 2.24 AU (335,000,000 km) |
| Periastron | 1.31 AU (196,000,000 km) |
| 1.78 AU (266,000,000 km)[1] | |
| Eccentricity | 0.26 ± 0.06[1] |
| 956 ± 14[1] d 2.62 y | |
Average orbital speed | 20.3 |
| 2,453,631 ± 30[1] | |
| 177 ± 12[1] | |
| Semi-amplitude | 8.4 ± 0.4[1] |
| Star | HD 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
- Santos, N. C.; et al. (2010). "The HARPS search for southern extrasolar planets XXI. Three new giant planets orbiting the metal-poor stars HD5388, HD181720, and HD190984". Astronomy and Astrophysics. 512. A47. arXiv:0912.3216. Bibcode:2010A&A...512A..47S. doi:10.1051/0004-6361/200913489.
- "Approved names". NameExoworlds. Retrieved 2020-01-02.
- "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
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