Effemeridi MPC: http://www.minorplanetcenter.org/iau/MPEph/MPEph.html

NEO Confirm  : http://www.minorplanetcenter.org/iau/NEO/ToConfirm.html

NeoDys          : http://newton.dm.unipi.it/neodys/index.php

OrbitSimulator : http://neo.jpl.nasa.gov/orbits/

Supernove    : http://www.cfa.harvard.edu/iau/lists/RecentSupernovae.html

Astrometrica  : http://www.astrometrica.at/

Call              : http://www.minorplanetobserver.com/astlc/default.htm