Solar System (Subscribe)
Links
PDS - Planetary Data System
Solar system exploration science data archive, maintained at JPL.
National Space Science Data Center
Provides access to a wide variety of astrophysics, space physics, solar physics, lunar, and planetary data from NASA space flight missions, in addition to selected other data, models, and software.
IAU: Minor Planet Center
http://www.cfa.harvard.edu/iau/mpc.html
The official body that deals with astrometric observations, and orbits of minor planets, asteroids, and comets.