The MESSENGER spaceprobe successfully flew by Mercury, passing only 228 kilometres above the surface, just before 21:55 GMT, 29th September, in its third and final flyby of the planet. The first images from the flyby will be released around 14:00 GMT on the 30th September, 2009.
NASA's Messenger spacecraft -- with a University of Colorado instrument onboard -- will whiz by Mercury for the third and final time Tuesday, snapping photos of previously unseen terrain on the way past. The spacecraft will also use the planet's gravitational field to scrub some speed. In all, it will take seven years, 15 trips around the sun and three flybys of Mercury to brake Messenger's speed enough allow it to drop gently into orbit around the tiny planet in March 2011.
MESSENGER's Neutron Spectrometer Zeros In on Mercury's Crust
"You bet, I'm really excited about this flyby" - William C. Feldman, a Senior Scientist at the Tucson-based Planetary Science Institute and Cognizant Co-Investigator for the Neutron Spectrometer flying aboard the MESSENGER spacecraft.
MESSENGER will make its third and final pass around Mercury tomorrow (Sept. 29) before returning in March 2011 to go into orbit around the solar system's innermost planet. The current flyby is designed to slow the spacecraft and to prepare its trajectory for orbital insertion. Feldman is excited about taking a close look at the side of Mercury that MESSENGER flew by on its second encounter with the planet in October 2008 and about seeing another five percent of the planet's surface that is being imaged for the first time.
Nasa's Messenger probe is about to make its third and final fly-by of Mercury. The pass, just 228km from the surface, will make use of the planet's gravity to help slow the spacecraft enough to enable it to enter into orbit in 2011. Messenger will train its instruments on scientifically interesting craters and study the stream of charged particles blasted from its surface by the Sun.