SMART-1 set for more lunar science

Sep 26, 2005
SMART-1 celebrates its first year in space

ESA’s SMART-1 mission in orbit around the Moon has had its scientific lifetime extended by ingenious use of its solar-electric propulsion system (or ‘ion engine’).

In February this year, the SMART-1 mission was granted financial support to extend the mission by one year, starting at the end of July 2005. However, whether SMART-1 could actually survive that length of time all depended on the propulsion system, the ion engine, and the small amount of xenon fuel left on board.
Without using the remaining fuel and letting the orbit decay naturally, SMART-1 would have ended its mission sometime before May 2006. Engineers and flight controllers at ESA’s European Space Operations Centre (ESOC) in Darmstadt, Germany, were aware that the ion engine could not use all the fuel left on board. They had to keep two kilograms of fuel to maintain sufficient gaseous pressure inside the tank to be able to control the engine thrust.

However, ESA and industry worked together to find a way to stretch the technology of SMART-1’s engine to set a new record. New simulations and analysis allowed the SMART-1 flight control team to successfully operate the engine until the almost the last drop of fuel was consumed and an orbit with one-year lifetime was reached.

A series of re-boost manoeuvres, beginning in August 2005 has allowed the mission to be extended by one year, until July 2006. The engine was shutdown finally on 17 September after the last of these re-boost operations. SMART-1 is now coasting around the Moon ready to restart science observations on 1 October.

These re-boosts also brought the spacecraft into the optimal orbit to perform the more complex scientific observations to come in the extended phase. This orbit will have a perilune (lowest point of its orbit) closer to the equator than before, with very good solar illumination conditions over the whole year.

"This mission has given ESA a valuable experience about electric propulsion operations and navigation that can be exploited in future missions," says Octavio Camino-Ramos, SMART-1 Spacecraft Operations Manager at ESOC.

From now on SMART-1 will be left in a natural orbit determined by lunar gravity, but also by perturbations by Earth and the Sun. Analyses show that SMART-1 will end its life naturally, through impact with the Moon surface, around mid August 2006.

Bernard Foing, ESA’s SMART-1 Project Scientist, said, "The first scientific phase of the mission, from March to July 2005, was essentially dedicated to simple observations of the Moon and the study of the behaviour of spacecraft and instruments in the difficult thermal conditions of the lunar environment. From early October, with the extended scientific phase, SMART-1 will perform more complex science operations."

This autumn, science operations will include so-called ‘push broom’ observations, in which the spacecraft will be able to take colour images of the Moon surface by superimposing sequences of images of the same area taken with different colour filters.

"Multi-colour observations, surveys of the composition of the Moon, studies of polar regions illumination, the search for ice, support for future international lunar missions, and low-altitude observations until impact are our major objectives for this year," added Bernard Foing.

Source: ESA

Explore further: Spitzer telescope witnesses asteroid smashup

add to favorites email to friend print save as pdf

Related Stories

Avatars make the Internet sign to deaf people

11 minutes ago

It is challenging for deaf people to learn a sound-based language, since they are physically not able to hear those sounds. Hence, most of them struggle with written language as well as with text reading ...

Recommended for you

Spitzer telescope witnesses asteroid smashup

16 hours ago

(Phys.org) —NASA's Spitzer Space Telescope has spotted an eruption of dust around a young star, possibly the result of a smashup between large asteroids. This type of collision can eventually lead to the ...

Informing NASA's Asteroid Initiative: A citizen forum

17 hours ago

In its history, the Earth has been repeatedly struck by asteroids, large chunks of rock from space that can cause considerable damage in a collision. Can we—or should we—try to protect Earth from potentially ...

Image: Rosetta's comet looms

23 hours ago

Wow! Rosetta is getting ever-closer to its target comet by the day. This navigation camera shot from Aug. 23 shows that the spacecraft is so close to Comet 67P/Churyumov-Gerasimenko that it's difficult to ...

User comments : 0