planets

Resources:

Planetary Data System
PDS archives and distributes scientific data from NASA planetary missions, astronomical observations, and laboratory measurements. The PDS is sponsored by NASA's Office of Space Science.
http://pds.jpl.nasa.gov/

Observatoire de Paris-Meudon
Bibliothèque de l'Observatoire de Paris - Meudon.
http://www.obspm.fr/

Harvard-Smithsonian Center for Astrophysics
Collaboration between Harvard College Observatory and the Smithsonian Astrophysical Observatory
http://cfa-www.harvard.edu/