Europe's first lunar mission heads for planned impact on moon

At 2 km./ second, the impact of the SMART-1 spacecraft was expected to leave a 3 X 10-meter crater.

September 3, 2006 08:55
2 minute read.
Europe's first lunar mission heads for planned impact on moon

smart 1 moon probe. (photo credit: AP)

Europe's first spacecraft to the moon ended its three-year mission Sunday by crashing into the lunar surface in a volcanic plane called the Lake of Excellence, to a round of applause in the mission control room. Hitting at 2 kilometers (1 miles) per second, or 7,200 kilometers per hour (4,475 mph), the impact of the SMART-1 spacecraft was expected to leave a 3-meter-by-10-meter crater and send dust kilometers above the surface. Observatories watched the event from Earth and scientists hoped the cloud of dust and debris would provide clues to the geologic composition of the site. "That's it - we are in the Lake of Excellence," said spacecraft operations chief Octavio Camino as applause broke out in mission control in Darmstadt, Germany. "We have landed." Minutes later, officials showed off a picture captured by an observatory in Hawaii displaying a bright flash from the impact. On Saturday, mission controllers in Darmstadt, Germany had to raise the spacecraft's orbit by 600 meters (2,000 feet) to avoid hitting a crater rim on final approach. Had the orbit not been raised, the craft would have crashed one orbit too soon, making the impact difficult or impossible to observe. The spacecraft is at the end of a three-year mission that scanned the lunar surface from orbit and tested a new, efficient ion-propulsion system that officials hope to use on future interplanetary missions. Launched into Earth's orbit by an Ariane-5 booster rocket from Kourou, French Guiana, in September 2003, SMART-1 used its ion engine to slowly raise its orbit over 14 months until the moon's gravity grabbed it. The engine, which uses electricity from the craft's solar panels to produce a stream of charged particles called ions, generates only small amounts of thrust but only needed 80 kilograms (176 pounds) of xenon fuel. The craft's X-ray and infrared spectrometers have gathered information about the moon's geology that scientists hope will advance their knowledge about how the moon's surface evolved and test theories about how the moon came into being. SMART-1, a cube measuring roughly a meter on each side, took the long way to the moon - more than 100 million kilometers (62 million miles) instead of the direct route of 350,000 to 400,000 kilometers (217,000 to 250,000 miles). But the European Space Agency did it for a relatively cheap €110 million (US$140 million). The spacecraft has also been taking high-resolution pictures of the surface with a miniaturized camera.

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