Comment Re:We may hear from Philae later (Score 1) 337
Yes, the comet's perihelion is about 1.3AU so not much farther than Earth's orbit (and so Earth surface heat input), and yes, ice melting temperature drops significantly with pressure. As for what forms the emission takes, this is one of the huge questions Rosetta is suppoed to answer - we've never observed a comet from near enough to see how exactly the melting process works. In one hand, the chance that they will be explosive is quite low (though non-zero, under-rock ice pockets heating up and accumulated steam blasting its way out), on the other hand Philae weighs about 1 gram while on Chury, and its size is around 1 cubic meter. That's about the parameters of 1m^3 sized soap bubble when it comes to reacting to "wind". So the emission doesn't have to be anywhere near to explosive; even mild zephyr from under the surface can move the lander.
Since we still don't know about the character of the emissions from the comet, we can only guess whether the point when Philae heats up enough to starts charging its batteries happens before or after the comet produces enough steam to blow it away.
Of course, had the harpoons deployed, that would be moot. Currently the outlook isn't too good. Philae is in a hole, which can channel the steam into a stream. Plus its systems could have been damaged by extreme cold, plus even the intensified sun input may be insufficient, plus the 'seasonal shift' of shadows can (though is unlikely) to worsen the shadow conditions... Still - until the comet actually begins emitting steam and we see how it does it, we have really no clue what's going to happen.
Check this nice graph for water behavior in different pressures.