Eccentric Jupiter
An eccentric Jupiter is a Jovian planet that orbits its star in an eccentric orbit. Eccentric Jupiters may probably disqualify a planetary system from having Earth-like planets in it because a massive gas giant with an eccentric orbit may remove all Earth mass exoplanets from the habitable zone, if not from the system entirely.
To date, it appears that approximately 7% of all stars have an eccentric Jupiter, making these planets more common than Hot Jupiters.
Out of the more than 200 extrasolar planet discoveries, 15 planets have high eccentricities.
The typical exoplanet with an orbital period greater than 5 days has a median eccentricity of 0.23.
Possible habitable zone planets near eccentric Jupiters:
| Planet | SMA | ecc | MJ | Notes |
| HD 3651 b | 0.29 | 0.61 | 0.22 | Might allow for planets at or beyond 0.6 AU |
| HD 37605 b | 0.26 | 0.73 | 2.84 | Might allow for planets at or beyond 0.8 AU |
| HD 45350 b | 1.92 | 0.77 | 1.79 | Restricted stable orbits to the innermost 0.2 AU |
| HD 80606 b | 0.45 | 0.93 | 4.0 | Only beyond 1.75 AU did simulated particles remain |
| HD 20782 b | 1.381 | 0.97 | 2.620 | |
| HD 89744 b | 0.93 | 0.67 | 8.58 | No terrestrial planets in the habitable zone |
| 16 Cygni Bb | 1.68 | 0.68 | 1.68 | No terrestrial planets in the habitable zone |