Hacker News new | ask | show | jobs
by gokhan 4230 days ago
From Reddit[1]:

"Got fresh news from the team, they are broadcasting live right now on french TV ! Philae landed, and bounced slowly for (1-2-? hours), and travelled 1km away the targetted site. Yes 1000m. Then know this because of the datas from the radar. It's now stopped slanted, some cams are shooting the sky, other the ground, and other nearby rocks, as seen on the first photo. It's inside some kind of cave/hole, not much sun for the solar panels.

EDIT1: It landed on the core of the comet, it sees the light from the sun for about 1 to 2 hours per day. In the next days/week the angle of the comet will change/sun, and it very likely the solar panel will get more sunlight so more power for the probe.

EDIT2 : Many labs are performing right now and performed the whole night. For now they put the drilling on hold since they don't know if it's tied to the ground or not. Drilling op was also power hungry so it's kinda a good thing it's on hold since there's not much sun available for the panels. Battery life been re-estimated to 50-55hours due to the lack of sunlight. This time includes the 7 hours of descent.They are constantly adjusting missions goals, depending on conditions, power available, etc,

EDIT3 : The probe has been working to gather scientifict datas the whole time, including during the bounces. There's already a large amount of datas available, whatever happens next.

EDIT4 : It's resting on "hard" ground, with a layer of dust about 30cm, and that's good news because it allows measurements to proceed as planned. As in, it's not burried into soft soil.

EDIT5 : Solar panels are deployed, radio link is up and running, but the fact the probe is slanted/in a hole/random ground limits the time it can communicate with the orbiter, but that's not jeopardizing the mission. There's already a lot of datas transmitted successfully to the orbiter. Contact between the orbiter and the probe can be approximately done twice per day.

EDIT6 : The first place it touched the comet was exaclty where it was planned, flat and cosy, too bad it didn't harpoon there.

EDIT7 : Next contact will be near 19:30GMT, until 23:45GMT approx. This night they made contact with the probe (from the orbiter) at about 4:00GMT, and at 5:30GMT they had safely recovered all the datas from the first batch of tests."

[1] http://www.reddit.com/r/space/comments/2m63hd/first_civa_ima...

3 comments

> travelled 1km away the targetted site. Yes 1000m.

Wow, I think this is great luck, that the probe is still on the comet, and even seems to work properly.

Does the comet have enough gravity to hold on to dust? How do these small space objects even stay together?
> Does the comet have enough gravity to hold on to dust?

Yes. Philae's weight on the comet is roughly equivalent to a few ounces/100g* on Earth. It's why there's so much concern about it not being anchored correctly; deploy the wrong instrument and you might push it away from the surface and out into space. So there is a significant gravitational attraction from the comet, just not very much!

* I've seen a few different estimates for this, but it's of this order.

> I've seen a few different estimates for this

Considering the comet's irregular shape, it probably depends a lot on exactly where the lander is.