The LCROSS Lunar mission (one of two such satellites going to the moon) was
launched this afternoon approximately 5:32 PM EST. Its trajectory will soon be
available on the JPL Horizons web site:

http://ssd.jpl.nasa.gov/horizons.cgi#results

Quote below from that JPL web page:

"After launch, the LCROSS shepherding spacecraft and the Atlas V's Centaur upper
stage rocket will execute a fly-by of the moon and enter into an elongated Earth
orbit to position LCROSS for impact near a lunar pole.

On final approach, the shepherding spacecraft and Centaur will separate. The
Centaur will impact, creating a crater about 20 meters in diameters and a debris
plume that will rise above the lunar surface. Following four minutes behind, the
shepherding spacecraft will fly through the debris
plume, collecting and relaying data back to Earth before impacting the lunar
surface and creating a second debris plume.

The debris plumes are expected to be visible from Earth- and space-based
telescopes 10-to-12 inches and larger."

Bob N.