The ESA has spent an eventful weekend now that the Rosetta probe has woken up after a long sleep on a comet:
Hidden by shadows, Philae shut down on 15 November 2014 at 00:36 GMT after completing its main science operations sequence on the comet when the primary battery expired as expected after about 60 hours.
Since March 2015, when Philae’s environmental conditions started to improve with higher surface temperatures and better illumination, the orbiter’s receiver had been turned on periodically to listen for signals from the lander when the orbital geometry was thought to be optimum.
On the evening of 13 June, a weak but solid radio link between Rosetta and the lander was finally established for 85 seconds. More than 300 ‘packets’ – 663 kbits – of lander housekeeping telemetry were received. This information had been stored on board at an as-yet-to-be determined time in the past, as much as several days to a few weeks, so does not necessarily reflect the lander’s current status.
A second, smaller burst of lander data was received on Sunday, 14 June, at about 21:26 GMT, lasting just a few seconds. These data were confirmed to give the current status, showing the lander’s internal temperature had already risen to –5ºC.
It is believed that there is sufficient power now being generated to allow some science measurements during the time Philae is illuminated, with initial activities focusing on low-power measurements. This first phase would also likely include measurements that did not previously generate science in November.
(I really like the phrase “generate science.” Someday, we’ll make enough for everyone.)