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JPL Solar System Dynamics
Welcome to the JPL solar system dynamics web site. This site provides information related to the orbits, physical characteristics, and discovery circumstances for most known natural bodies in orbit around our sun.

  Features

logo - ephemerides Ephemerides
High-precision ephemerides with custom selected observing parameters are available using our HORIZONS system.
logo - orbits Orbits
Orbit diagrams for most solar system bodies as well as tables of orbital elements for the planets, planetary satellites, asteroids and comets are available.
logo - physical data Physical Characteristics
Selected physical characteristics of the planets, planetary satellites, and some small-bodies are available.
logo - discovery Discovery Circumstances
For many solar system bodies, discovery circumstances such as date, location, and discoverers are available.
logo - tools On-Line Tools
We provide a number of on-line tools in addition to our HORIZONS system, including a date/time converter and small-body identification from astrometry.

Where to Find More

If you can't find what you're looking for on our site, be sure to check our site map before giving up. While we don't provide an exhaustive list of related external web sites, you may find what you're looking for on our links page.

This site does not provide information about stars, galaxies, extra-solar planets, or any other objects outside our solar system. Please try JPL's Stars & Galaxies site for related information.

Artificial satellites and other spacecraft are also beyond the scope of this site. However, ephemerides for selected spacecraft are available via our HORIZONS system.

If you are looking for orbital elements of Earth-orbiting spacecraft (artificial satellites), you might try the CelesTrak site.

Don't forget to check our list of Frequently Asked Questions (FAQ) and possibly our glossary of selected terms. If you still can't find what you're looking for and believe it should be on our site, please let us know.

This site is maintained by JPL's Solar System Dynamics Group.

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