Back HD 11977 b Arabic Eta2 de l'Hidra Mascle b Catalan Eta² Hydri b Spanish Eta2 Hydri b ID Eta2 Hydri b Italian 물뱀자리 에타² b Korean Eta2 Hydri b Portuguese 水蛇座η2b Chinese
| Discovery | |
|---|---|
| Discovered by | Setiawan et al. |
| Discovery site | Chile, La Silla |
| Discovery date | 25 May 2005 |
| Radial velocity | |
| Orbital characteristics | |
| 1.93 AU (289,000,000 km) | |
| Eccentricity | 0.40±0.07 |
| 711±8 d | |
| 2,451,420 | |
| 351.5±9.5 | |
| Semi-amplitude | 105±8 |
| Star | Eta2 Hydri |
| Physical characteristics | |
| Mass | >6.54 MJ |
Eta2 Hydri b (η2 Hyi b, η2 Hydri b), commonly known as HD 11977 b, is an extrasolar planet that is approximately 217 light-years away in the constellation of Hydrus. The presence of the planet around an intermediately massive giant star provides indirect evidence for the existence of planetary systems around A-type stars.