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After months of silence, comet lander Philae phones home

Philae, the European Space Agency's comet lander that had bounced into an area with little sunlight for its solar panels, has finally woken up, say scientists.

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ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA
The European Space Agency's Philae comet lander is seen by the Rosetta spacecraft in this image captured on Nov. 12, 2014 as Philae headed for its landing on Comet 67P/Churyumov-Gerasimenko. The probe went silent 60 hours later and reawakened on June 13, 2015.
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ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA
These images from the European Space Agency's Rosetta spacecraft show the approach of the Philae comet lander (insets) to Comet 67P/Churyumov–Gerasimenko on Nov. 12, 2015, including views of the probe's bounces on the surface.
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ESA/Rosetta/NavCam – CC BY-SA IGO 3.0; insets: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA
This European Space Agency image of Comet 67P/Churyumov–Gerasimenko show the five most likely candidates for the final landing spot of the Philae lander after it separated from the Rosetta spacecraft on Nov. 12, 2015. The top left candidate may be the most likely site for Philae.

A European probe that made a bouncy landing on a comet last year, and then slipped into a silent hibernation, is alive again and phoning home. 

The European Space Agency's Philae comet lander, which dropped onto Comet 67P/Churyumov-Gerasimenko from the Rosetta spacecraft last November, beamed an 85-second wake-up message to Earth via Rosetta yesterday (June 13), ESA officials announced today. It was the first signal from Philae in seven months since the probe fell silent on Nov. 15 after its historic comet landing. 

"Philae is doing very well," Philae project manager Stephan Ulamec of the German Aerospace Center (DLR), said in a statement. "The lander is ready for operations." [See more comet photos from Rosetta and Philae]

According to Ulamec, Philae is currently experience temperatures of minus 31 degrees Fahrenheit (minus 35 degrees Celsius) and has about 24 watts of power available. During its wake-up call to Earth, Philae beamed 300 data packets home and was most likely active before the first signal reached Earth on Saturday, ESA officials said. 

"We have also received historical data – so far, however, the lander had not been able to contact us earlier," Ulamec said in the same statement.

Philae is a solar-powered probe about the size of a washing machine that landed on Comet 67P on Nov. 12, 2014. It dropped to the surface from its mothership Rosetta, but bounced twice when its anchor-like harpoon system failed to secure it to the surface. The probe ultimately ended up in the shadow of a cliff face on the comet. After about 60 hours the probe's batteries ran out and it went into hibernation on Nov. 15.

Over the last seven months, Rosetta and Philae mission scientists in Europe have hoped that once Comet 67P approached closer to the sun, Philae might receive enough sunlight to wake itself up from its forced slumber. Those hopes, it seems, have finally been realized. 

ESA officials said Philae has more details about Comet 67P to share with scientists on Earth. 

"Now the scientists are waiting for the next contact," ESA officials wrote in a statement. "There are still more than 8,000 data packets in Philae’s mass memory which will give the DLR team information on what happened to the lander in the past few days on Comet 67P/Churyumov-Gerasimenko."

The Rosetta comet mission launched toward Comet 67P in 2004 and traveled 4 billion miles (6.4 billion kilometers) over 10 years to reach its destination. Rosetta arrived at the comet in August 2014 and is expected to continue studying 67P through December.

Email Tariq Malik at tmalik@space.com or follow him @tariqjmalik and Google+. Follow us @Spacedotcom, Facebook and Google+. Original article on Space.com.

Copyright 2015 SPACE.com, a Purch company. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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