| HD 181720 b / Toge | |
| Discoverer: | Santos et al. |
| Discovery Site: | La Silla Observatory |
| Discovered: | October 19, 2009 |
| Discovery Method: | radial velocity (HARPS) |
| Apsis: | astron |
| Aphelion: | 2.24AU |
| Perihelion: | 1.31AU |
| Semimajor: | 1.78AU |
| Eccentricity: | 0.26 ± 0.06 |
| Period: | 956 ± 14 d 2.62 y |
| Avg Speed: | 20.3 |
| Time Periastron: | 2,453,631 ± 30 |
| Arg Peri: | 177 ± 12 |
| Semi-Amplitude: | 8.4 ± 0.4 |
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. This planet was detected by HARPS on October 19, 2009, together with 29 other planets.
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.[1] [2]