article_snippet: Lander system engineer Laurence O'Rourke told CNN that Philae needs 5.5 watts of power to reboot Philae, nine watts to switch on the receiver to accept communications and 19 watts to activate Philae transmitter and allow two-way communication with the orbiter.
article_snippet: On Tuesday, @ESA_Rosetta tweeted:
article_snippet: I have some opportunities to listen for @philae2014 to find out if @philae2014's awake!
article_snippet: " Rosetta and Philae's love affair on Twitter .
article_snippet: The mission website adds that Philae could already have woken up but does not yet have sufficient power to communicate with Rosetta.
article_snippet: The mission website says Rosetta will transmit to Philae between March 12 and March 20, listening for a response.
article_snippet: Beginning Thursday, mission controllers will send what O'Rourke described as "blind commands" to Philae in the hope that the lander has enough power to receive instructions even if the lander can't respond.
article_snippet: Philae will be told to save power for the transmitter.
article_snippet: Even if Philae never wakes up, all is not lost.
article_snippet: CNN Interactive: Rosetta and Rosetta mission .