SpaceRef - Astronomy - Solar System

JPL HORIZONS On-Line Solar System Data and Ephemeris Computation - HORIZONS provides access to key solar system data and flexible production of highly accurate ephemerides for solar system objects (24000+ asteroids and comets, 64 natural satellites, 9 planets, the Sun). [NASA Jet Propulsion Laboratory]

NASA Planetary Photojournal - This service is designed to provide visitors with easy access to the publicly released images from various Solar System exploration programs. The system database is currently populated with approximately 1930 images. [NASA Jet Propulsion Laboratory]

Planetary Data System - The Planetary Data System (PDS) archives and distributes digital data from past and present NASA planetary missions, astronomical observations, and laboratory measurements. The PDS is sponsored by NASA's Office of Space Science to ensure the long-term usability of data, to stimulate research, to facilitate data access, and to support correlative analysis. [NASA Jet Propulsion Laboratory]

Regional Planetary Image Facility (RPIF) Image Library - RPIF contains images, topographic maps, and geologic maps of the planets and their satellites taken both from Earth and in space. The RPIF is intended for use by individuals and groups who use photographic and cartographic material of the planets in their research programs. These programs include geologic, photometric, colorimetric, photogrammeric, and atmospheric dynamical studies. [NASA Jet Propulsion Laboratory]

Solar System Dynamics - This web site provides information related to all known bodies in orbit around the sun including mean orbital elements, physical properties, observer tools, and astrodynamic constants. [NASA Jet Propulsion Laboratory]

Solar System Simulator - This amazing website allows you to visit all of the worlds in our solar system and get a simulated view from any vantage point on - or above these worlds. [NASA Jet Propulsion Laboratory]

Welcome to the Planets - This is a collection of basic planetary data and many of the best images from NASA's planetary exploration program extracted from the interactive program "Welcome to the Planets" which was distributed on the Planetary Data System Educational CD-ROM Version 1.5 in December 1995. [NASA Jet Propulsion Laboratory]

Welcome to the Planets CD-ROM - This educational CD-ROM contains 190 selected images acquired over approximately 20 years of NASA planetary exploration. Each image is accompanied by information about Solar System bodies and various spacecraft that explored them. [NASA Jet Propulsion Laboratory]