15 November 2014 at 0:15 UTC: Philae shut down (into hibernation)
12 March 2015: Rosetta orbiter communication unit turned on to listen out for the lander
13 June 2015 at 20:28 UTC: Philae communicates to ESA, Darmstadt via Rosetta that it has woken up
(UTC=Universal Coordinated Time == same as GMT)
(UK is currently UTC 01:00 due to Summer Time)
(Darmstadt is currently CEST == UTC 02:00)
Naturally, Philae tweeted that it was awake:
“Waking up” is a complicated business for Philae:
It looks like Philae has been awake for a while, but unable to contact it’s mother ship Rosetta. When out of contact it is designed to place gathered data into non-volatile storage and, after contact had been made, Philae sent 300 data packets & reported another 8,000 waiting to be sent.
ESA still does not know exactly where the pesky lander landed. As radio communication continues that will also eventually be answered.
--------- Alex Kemp