Rosetta’s Lander Philae Wakes Up From Hibernation

Philae touchdown. Image Credit: ESA

Philae touchdown. Image Credit: ESA

June 15, 2015 – Rosetta’s lander Philae has woken up after seven months in hibernation on the surface of Comet 67P/Churyumov-Gerasimenko.

The signals were received at ESA’s European Space Operations Centre in Darmstadt at 22:28 CEST on June 13. More than 300 data packets have been analysed by the teams at the Lander Control Center at the German Aerospace Center (DLR).

“Philae is doing very well: It has an operating temperature of -35ºC and has 24 Watts available,” explains DLR Philae Project Manager Dr. Stephan Ulamec. “The lander is ready for operations.”

For 85 seconds Philae “spoke” with its team on ground, via Rosetta, in the first contact since going into hibernation in November.

When analysing the status data it became clear that Philae also must have been awake earlier: “We have also received historical data – so far, however, the lander had not been able to contact us earlier.”

Now the scientists are waiting for the next contact. There are still more than 8000 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.

Philae shut down on November 15, 2014 at 1:15 CET after being in operation on the comet for about 60 hours. Since March 12, 2015 the communication unit on orbiter Rosetta was turned on to listen out for the lander.

Rosetta is an ESA mission with contributions from its member states and NASA. Rosetta’s Philae lander is provided by a consortium led by the German Aerospace Center in Cologne; Max Planck Institute for Solar System Research in Göttingen; French National Space Agency in Paris; and the Italian Space Agency in Rome.

NASA’s Jet Propulsion Laboratory in Pasadena, California, manages the U.S. contributions to the Rosetta mission for the agency’s Science Mission Directorate in Washington. JPL also built the MIRO instrument and hosts its principal investigator, Samuel Gulkis. The Southwest Research Institute, located in San Antonio and Boulder, developed Rosetta’s IES and Alice instruments and hosts their principal investigators, James Burch (IES) and Alan Stern (Alice).