An eccentric Jupiter is a Jovian planet that orbits its star in an eccentric orbit.[1] Eccentric Jupiters may 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 planets from the habitable zone.

To date, it appears that approximately 7% of all stars (half of the known planetary systems) have an eccentric Jupiter (e > 0.1), making these planets more common than Hot Jupiters.Template:Citation needed

Out of the more than 200 extrasolar planet discoveries (as of 2006), 15 planets have high eccentricities (e > 0.6).[2]

The typical exoplanet with an orbital period greater than 5 days has a median eccentricity of 0.23.[3]

Possible habitable zone planets near eccentric Jupiters:[2]

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 test 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

See alsoEdit


  1. Raymond, Sean N.; Quinn, Thomas; Lunine, Jonathan I. (March 2004). Making other earths: dynamical simulations of terrestrial planet formation and water delivery. Icarus 168 (1): 1–17. Note: this study treats eccentric Jupiters as giant planets having an orbital eccentricity of 0.1 or greater.
  2. 2.0 2.1 Wittenmyer et al. (2007). Dynamical and Observational Constraints on Additional Planets in Highly Eccentric Planetary Systems. The Astronomical Journal 134 (3): 1276–1284.
  3. Kathryn; Fischer; Marcy; et al. (2009). Old, Rich, and Eccentric: Two Jovian Planets Orbiting Evolved Metal-Rich Stars. Publications of the Astronomical Society of the Pacific 121 (880): 613–620.


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