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IRON AND ICE
Triumphant comet probe sends last-gasp data from 'alien world'
by Staff Writers
Paris (AFP) Nov 15, 2014


Philae lander goes silent away from battery-charging sunlight
Darmstadt, Germany (UPI) Nov 15, 2014 - The pioneering lander that made history and gained worldwide notoriety by landing on a comet some 300 million miles away has stopped working -- at least for now.

The Rosetta spacecraft's Philae lander set itself down aboard comet 67P right on target but bounced off the ground a few times and landed in a spot where its solar panels aren't getting enough sunlight.

According to the European Space Agency, all systems on Philae have shut down for a "possibly long silence."

"Prior to falling silent, the lander was able to transmit all science data gathered during the First Science Sequence," said Stephan Ulamec from the European Space Operations Center.

"Despite the unplanned series of three touchdowns, all of our instruments could be operated and now it's time to see what we've got."

Expected in the information being analyzed from Philae are results from its attempt to drill down into the surface of the comet. The lander used its ROLIS, COSAC, Ptolemy, SD2 and CONSERT instruments to gather data, which could reveal the comet's inner structure.

Though currently out of contact with mission control in Darmstadt, Germany, scientists hope to be able to position the lander in better sunlight so its batteries will at least partially recharge, allowing it to once again communicate with the ground team.

An initial attempt to do that on Saturday failed, but Ulamec thinks that as the comet flies closer to the sun, more sunlight may be able to reach the lander in order to give its batteries a boost.

"We still hope that at a later stage of the mission, perhaps when we are nearer to the Sun, that we might have enough solar illumination to wake up the lander and re-establish communication," Ulamec said.

The Rosetta spacecraft carrying Philae was launched ten years ago and traveled more than six billion miles before its August rendezvous with comet 67P. Philae touched down on the comet's surface on Wednesday.

Robot probe Philae uploaded a slew of last-minute data to Earth Friday from a comet in deep space, before going to sleep at the end of its historic mission, ground controllers said.

Data streamed in as soon as Europe's pioneering robot lab reestablished late-night contact with its orbiting mothership, Rosetta, but its limited battery soon started wavering.

"My #lifeonacomet has just begun," said an official tweet in the name of the washing machine-sized lander perched on comet 67P/Churyumov-Gerasimenko since Wednesday -- concluding with a restful "zzzzz".

"S'ok Philae, I've got it from here for now. Rest well...," said a response tweeted on behalf of Rosetta.

The European Space Agency (ESA) said its robot lab had entered "idle mode", with all instruments and most systems shut down after three days of non-stop work -- taking pictures and probing the comet's density, temperature, composition and atmosphere.

"Prior to falling silent, the lander was able to transmit all science data gathered," said a statement.

The lander and its mothership, which relayed Philae's data to Earth, had only two communications windows per day -- the last opened around 2130 GMT on Friday and closed at 0036 GMT the next morning as Rosetta disappeared in orbit behind the comet.

Mission controllers had feared the robot may not even have enough power to make contact during this window -- but they were pleasantly surprised.

"Science from an alien world" ESA Operations tweeted when contact was made. "Info now flowing from @ Philae2014."

The channel should open again around 1000 GMT Saturday, but lander manager Stephan Ulamec told AFP from mission control in Darmstadt, Germany, he did "not really expect" contact with Philae then.

"The chances that we could reestablish the link again tomorrow are really very, very low," he said.

"The battery is not completely empty, but it is below the level the central computer needs to boot" up.

In one of many jaw-dropping achievements, the robot lab appears to have lifted itself slightly on Friday and rotate the larger of its solar panels to absorb as much energy as possible to be stored for a possible wakeup later.

Philae had landed in a dark ditch after a bouncy touchdown Wednesday, and did not get enough sunlight to recharge its batteries sufficiently to extend its mission.

Mission engineers dream, however, of making contact with the lander "at some point" in the coming months as the comet, with Philae hopefully still clinging to its surface, moves closer to the Sun.

Philae's historic on-site survey of a comet travelling at 18 kilometres (11 miles) per second, currently at a distance of 510 million kilometres (320 million miles) from Earth, is the highlight in a more than decade-long mission.

Philae landed Wednesday after a nail-biting seven-hour, 20-km descent from Rosetta, which had travelled more than a decade and 6.5 billion kilometres (four billion miles) to meet up with the comet in August this year.

The touchdown did not go entirely as planned, when Philae's duo of anchoring harpoons failed to deploy and it lifted off again... twice.

The lander finally settled in a crevice in a location that remains a mystery, and data revealed it was shadowed from sunlight that could have extended its core, battery-powered mission of 60-odd hours.

- 'First comet drilling' -

Among the most anticipated data from Philae is chemical analysis of a drill sample which scientists hope will shed light on the origins of the Solar System 4.6 billion years ago, and maybe even life on Earth.

The ESA confirmed that Philae had drilled Friday, though it did not specify whether a sample had been obtained.

"I confirm that my (drill) went all the way DOWN and UP again!!" said a tweet in the robot's name. "First comet drilling is a fact!"

The Rosetta-Philae team said Friday they were ecstatic with the results.

"We're in the middle of drinking champagne because this mission is a success," Philippe Gaudon, the head of the Rosetta project at France's space studies centre CNES, told AFP early on Saturday.

All 10 instruments on board the 100-kilogramme (22-pound) lab had kicked into action.

"This machine performed magnificently under tough conditions, and we can be fully proud of the incredible scientific success Philae has delivered," said Ulamec.

The 1.3-billion-euro ($1.6-billion) mission aims to unlock the secrets of comets, which some astrophysicists believe may have "seeded" Earth with some of the ingredients for life.


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IRON AND ICE
Comet probe in race against time to crown stellar feat
Paris (AFP) Nov 14, 2014
Europe's deep-space robot lab Philae worked against the clock Friday, attempting to drill into a comet 510 million kilometres (320 million miles) from Earth to crown a historic exploration before its battery runs out. Charged with 60 hours of onboard power, the lander bounced twice after touchdown Wednesday, settling in a crevice in a mystery location, shadowed from battery-boosting sunlight ... read more


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