article_snippet: Experts have abandoned an eight-day vigil for a wakeup call from the robot lander Philae, but remained hopeful the scout will revive as the scout rides on a comet nearing the Sun.
article_snippet: Philae had just enough juice to carry out a 54-hour roster of core experiments before going into shutdown mode.
article_snippet: It began to listen out for signals on March 12 as It launched a schedule of orbital swoops around the spot where Philae is believed to have landed.
article_snippet: Before the Philae lander batteries finally ran out, Philae managed to send back data on the few experiments it was able to conduct along with some images.
article_snippet: Once awake, Philae will turn on Philae receiver every 30 minutes and listens for a signal from the Rosetta orbiter.
article_snippet: Koen Guerts, part of the Philae lander team at the DLR Control Centre, said the Rosetta probe may have already woken up but is yet to send a signal home.
article_snippet: Koen Guerts, part of the Philae lander team at the DLR Control Centre said: 'Philae is designed so that, since November 2014, Philae has been using all the available solar energy to heat up.' 'At this time, we do not yet know that the lander is awake.
article_snippet: Over the next eight days the Rosetta orbiter is due to transmit signals to Philae and listen for the response during a series of 11 flybys.
article_snippet: Once Philae wakes up and can also transmit, Philae will first send data about Philae 'health' to Earth.
article_snippet: Currently, scientists believe that Philae is in sunlight for 1.3 hours - just a fraction of the 12.4 hour long day that the comet enjoys.