From the European Space Agency:
“Silent since its last call to mothership Rosetta seven months ago, the Philae lander is facing conditions on Comet 67P/Churyumov–Gerasimenko from which it is unlikely to recover.
“Rosetta, which continues its scientific investigations at the comet until September before its own comet-landing finale, has in recent months been balancing science observations with flying dedicated trajectories optimised to listen out for Philae. But the lander has remained silent since 9 July 2015.
“ ‘The chances for Philae to contact our team at our lander control centre are unfortunately getting close to zero,’ says Stephan Ulamec, Philae project manager at the German Aerospace Center, DLR. ‘We are not sending commands any more and it would be very surprising if we were to receive a signal again.’ ”
Read more about the Philae lander nearing the end of its mission.