Space agency extends mission of comet-orbiting spacecraft Rosetta
(CNN) — More than a decade after it first launched, the comet-orbiting spacecraft Rosetta — already seen as one of the great successes of space exploration — will be given an extra lease on life.
Rather than coming to a close in December as planned, its mission will be extended until the end of September 2016, the European Space Agency said in a statement Tuesday.
At that point, the spacecraft will most likely be landed on the surface of Comet 67P/Churyumov-Gerasimenko, which it reached in August — 10 years after it launched from Earth.
Earlier this month, the solar-powered spacecraft delighted project scientists when it re-established contact with the Philae comet lander for the first time since it went into hibernation after running out of power seven months ago.
This means Philae, on Comet 67P’s surface, can continue with experiments up to and beyond the comet’s closest approach to the sun in mid-August — called perihelion.
Philae is expected to run out of power for good in October, but the extension of Rosetta’s mission means scientists can continue to observe the comet’s progress as it loops away again from the sun.
“This is fantastic news for science,” Matt Taylor, the European Space Agency’s Rosetta project scientist, is quoted as saying in a news release.
“We’ll be able to monitor the decline in the comet’s activity as we move away from the sun again, and we’ll have the opportunity to fly closer to the comet to continue collecting more unique data. By comparing detailed ‘before and after’ data, we’ll have a much better understanding of how comets evolve during their lifetimes.”
Slow spiral to comet’s surface
By September next year, as the comet recedes ever farther from the sun, there will no longer be enough solar power to run Rosetta’s set of scientific instrumentation efficiently, the space agency said.
In June 2011, the spacecraft was put into hibernation for 31 months for the most distant leg of its journey out toward the orbit of Jupiter. But now, with little propellent remaining to power the orbiter’s thrusters, scientists instead propose sending it on a slow spiral down to the comet’s surface.
“This time, as we’re riding along next to the comet, the most logical way to end the mission is to set Rosetta down on the surface,” said Patrick Martin, Rosetta mission manager.
“But there is still a lot to do to confirm that this end-of-mission scenario is possible. We’ll first have to see what the status of the spacecraft is after perihelion and how well it is performing close to the comet, and later we will have to try and determine where on the surface we can have a touchdown.”
Before that potential touchdown, scientists will try to bring the spacecraft nearer to the comet — a safer prospect as its activity wanes after perihelion — for detailed observations that may make it possible definitively to spot Philae on the surface.
Rosetta should be able to gather data all the way down to the comet’s surface — a journey that could take three months. But the orbiter’s touchdown is likely to mark the end of its groundbreaking mission, the European Space Agency said.
Philae’s bumpy landing
Now it’s back in touch, Philae can carry out a whole host of experiments intended to shed light on how comets behave as they approach the sun.
It was originally hoped that after it landed in November, Philae would operate until March when the fierce heat of the sun would likely burn out its components.
But in what now appears to be a happy accident, the probe, which is about the size of a washing machine, bounced across the comet’s surface in the weak gravity after anchor devices failed, and it landed in a sheltered spot — protecting it from the worst of the solar scorching.
The European Space Agency, which is leading a consortium that includes NASA to find out more about the composition of comets and how they interact with the sun, has already notched up some notable firsts with the project.
It is the first time a mission has successfully orbited a comet, following it on its journey around the sun, and the first time a controlled landing has been made on a comet — even though Philae encountered a bumpy ride.
And the Rosetta mission has already discovered organic chemicals on the comet surface.
CNN’s Dave Gilbert and Damien Ward contributed to this report.
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