HD 20781 d
HD 20781 d is an extrasolar planet orbiting the K-type main-sequence star HD 20781 117 light years away in the southern constellation Fornax. It was discovered in 2011 during a survey for southern exoplanets conducted with HARPS using doppler spectroscopy, the radial velocity variations caused by the gravitational pull of the planet. Its existence was confirmed in another survey during 2017.
An artist's impression of HD 20781 d orbiting its host star. | |
| Discovery | |
|---|---|
| Discovered by | Mayor et al. |
| Discovery site | La Silla Observatory |
| Discovery date | 2011 |
| Doppler spectroscopy (HARPS) | |
| Orbital characteristics | |
| Periastron | 0.15 AU |
| Apoastron | 0.18 AU |
| 0.1647+0.0076 −0.0083 AU | |
| Eccentricity | 0.11+0.05 −0.06 |
| 29.1580+0.0102 −0.0100 d | |
| 2,455,511.3258+2.4394 −2.4382 JD | |
| 60.99°+30.79° −30.03° | |
| Semi-amplitude | 2.82+0.17 −0.16 m/s |
| Physical characteristics | |
Mean radius | ~3.18 R🜨 (estimate) |
| Mass | ≥10.61+1.20 −1.19 M🜨 |
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