Europe plans large lunar lander
Europe is pressing ahead with plans to send a sophisticated, unmanned
spacecraft to the surface of the Moon.
EADS Astrium has been awarded a 6.5m-euro contract by the European
Space Agency (Esa) to do further detailed design work on the mission.
The 700-800kg robot would be aimed at the lunar south pole, using
automated systems to guide itself into a gentle, precision landing. Once
down, it would release a small rover to trundle across the surface.
"The lander will have a set of scientific instruments onboard but the
science will be geared towards human exploration," said Simonetta Di
Pippo, the director of human spaceflight at Esa.
"We will be looking for minerals and, hopefully, water in the soil,
to see if we can prepare for a sustainable presence on the surface of
the Moon," she told BBC News.
Recent spacecraft observations have indicated that some polar craters
on the Moon probably hide vast reserves of ice deep in their shadows.
The new study is being led by the German division of EADS Astrium.
Michael Menking from the company observed: "This is an important
technology project. For sure, it's dedicated to the Moon but if you can
make a soft, precision landing on the lunar surface you can also do it
on other planetary bodies as well."
Self-selection The feasibility work conducted in industry, known as a
Phase B1 study, will elaborate the lander's key specifications, and
initiate some component development and testing.
These investigations will inform the fully costed mission proposal
(likely to come out at several hundred million euros), which will go
before Europe's space ministers for final approval in 2012.
If the politicians like the concept and decide to fund it, the robot
could leave Earth on a Soyuz rocket before the decade's end.
The mission would build upon the experience gained from Europe's
highly successful Automated Transfer Vehicle (ATV), which resupplies the
International Space Station (ISS).
Once in orbit, this 20-tonne freighter is capable of finding its own
way to the platform using advanced navigation and sensor technologies.
In a similar vein, the Moon lander would have to take itself to a
specific location, scan the area for slopes and boulders, and then pick
out a safe place to put down.
"You need to have hazard-avoidance," said Bruno Gardini, who heads
the Esa department in which the lunar lander project is embedded.
"During the descent, you have to keep targeting two or three
different landing sites, and so you have to keep the algorithm available
which is a very heavy load on the onboard processor. You need to be
ready to switch from one site to another to select the one that has
lowest risk."
Astronaut health The spacecraft would be targeted at the lunar south
pole because it has locations that enjoy extended sunlight. This is
necessary because Europe does not possess the radioisotope space
technology capable of generating the power and heat needed by robots to
survive long periods of darkness.
One possible landing site already under discussion is a ridge close
to Shackleton Crater where the Sun stays above the horizon for months on
end. Solar panel and battery technology should be sufficient to sustain
the robot at such a location.
"Depending on the illumination pattern, we would hope to have a
mission lasting several months, up to half a year," explained Richard
Fisackerly from Esa's project team.
"The patterns we're looking at actually don't consider continuous
illumination, but we should be able to tolerate very short periods of
darkness which may be brought about by obstacles on the horizon."
As well as looking for any local resources that could be used by
future human explorers, the lander's instruments would also assess the
lunar environment to understand the risks it could pose to astronauts,
said Esa project team-member James Carpenter.
"These have been identified as radiation and its effects on human
physiology; and the lunar dust environment - both in terms of the
physics of the behaviour of the lunar dust and the way it will interact
with the systems that are on the surface, but also in terms of the
potential health effects of lunar dust when it comes into contact with
humans," he told BBC News.
- BBC
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