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| Table of Contents | Enchanted Learning All About Astronomy |
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| Our Solar System | Stars | Glossary | Printables, Worksheets, and Activities | ||||||
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| Eccentricity is a measure of how an orbit deviates from circular. A perfectly circular orbit has an eccentricity of zero; higher numbers indicate more elliptical orbits.
Neptune, Venus, and Earth are the planets in our solar system with the least eccentric orbits. Pluto and Mercury are the planets in our solar system with the most eccentric orbits. |
 Eccentricity = e = c/a |
| Planet | Orbital Eccentricity | Perihelion (Point in Orbit Closest to Sun) measured in AU's | Aphelion (Point in Orbit Farthest from Sun) measured in AU's |
|---|---|---|---|
| Mercury | 0.206 | 0.31 | 0.47 |
| Venus | 0.007 | 0.718 | 0.728 |
| Earth | 0.017 | 0.98 | 1.02 |
| Mars | 0.093 | 1.38 | 1.67 |
| Jupiter | 0.048 | 4.95 | 5.45 |
| Saturn | 0.056 | 9.02 | 10.0 |
| Uranus | 0.047 | 18.3 | 20.1 |
| Neptune | 0.009 | 30.0 | 30.3 |
| Pluto | 0.248 | 29.7 | 49.9 |
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