SMART 1 - Latest results and lunar impact

We present the latest science and technology results of SMART-1. Using sun power only and 60 litres of Xenon fuel, SMART-1 escaped Earth orbit, reached lunar capture, descended to a science orbit from 400 to 3000 km in March 2005, re boosted the orbit to extend observations until august 2006. SMART-1 new technology instruments unveiled new clues on the lunar origin, composition, mineralogy, geology, as well as on impact, volcanic and tectonic processes that have shaped the Moon. SMART-1 obtained new views on polar, far side regions and sites of interest for future robotic and human exploration, and conducted measurements in preparation to the fleet of upcoming orbiters. Using attitude thrusters, the SMART-1 trajectory was also tuned in the last months to permit an impact on the Moon nearside. We describe the final operations that permitted an impact at specific date on 3 September 2006, hour and finally within 1 second of the predicted time in the Lake of Excellence. We describe the world wide impact campaign involving SMART-1 project and operations team, theoretical modellers, laboratory simulations, astronomical observatories, radio VLBI, amateur astronomers, public and media events organised to celebrate SMART-1 touch down. Following the real time impact event, we report on the last status of information from the spacecraft, and ground based observations of the flash, clouds of ejecta and debris, We draw lessons for the preparation of future orbiters, impactors and lunar lander missions.