| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| Parent star | ||
| Star | Eta2 Hydri | |
| Constellation | Hydrus | |
| Right ascension | (α) | 01h 54m 56s |
| Declination | (δ) | -67° 38′ 50″ |
| Distance | 216.89 ly (66.53 pc) |
|
| Spectral type | G8.5III | |
| Orbital elements | ||
| Semimajor axis | (a) | 1.93 AU |
| Eccentricity | (e) | 0.40±0.07 |
| Orbital period | (P) | 711±8 d |
| Argument of periastron |
(ω) | 351.5±9.5° |
| Time of periastron | (T0) | 2,451,420 JD |
| Semi-amplitude | (K) | 105±8 m/s |
| Physical characteristics | ||
| Mass | (m) | >6.54 MJ |
| Discovery information | ||
| Discovery date | 25 May 2005 | |
| Discoverer(s) | Setiawan et al. | |
| Detection method | Radial velocity | |
| Discovery site | La Silla | |
| Discovery status | Published | |
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.