1446: "Landing"

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Soup
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Re: 1446: "Landing"

Postby Soup » Wed Nov 12, 2014 11:18 pm UTC

<Blitzed!> What an adventure! Good little Philae :D Great content, everyone!
Spoiler:
Now to see how far the OTT's progressed since this morningEDIT2. For a while, it was pretty slow, due to everyone being here! :mrgreen:
EDIT2 Less than a page today. Eazy Peazy

EDIT:
Spoiler:
Well, I didn't see that coming.
Last edited by Soup on Wed Nov 12, 2014 11:22 pm UTC, edited 1 time in total.
Waiting for it...

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rivulatus
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Re: 1446: "Landing"

Postby rivulatus » Wed Nov 12, 2014 11:20 pm UTC

I refuse to believe that GLR is not going to update this comic again while the title test is still telling me that it is "[LIVE]".

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Re: 1446: "Landing"

Postby Pfhorrest » Wed Nov 12, 2014 11:21 pm UTC

Flumble wrote:
Envelope Generator wrote:I just noticed there's still one whale in there. It is HIDING! But it is not so smart!

Why does that phrase sound so familiar?

I thought that sounded familiar too. I feel like Björk said it in a previous xkcd, but I can't figure out which one.
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Re: 1446: "???"

Postby edo » Wed Nov 12, 2014 11:51 pm UTC

BlitzGirl wrote:I want to watch the deleted scenes, particularly the one where a leopard crashes into Rosetta and diverts it off-course.

I literally LOL'd.
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colonel_hack
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Re: 1446: "Landing"

Postby colonel_hack » Wed Nov 12, 2014 11:54 pm UTC

Klear wrote:
cah wrote:Is the comic finished? When do we find out about the harpoons?


That's probably it. I'd like to hear from Rosetta before the end though. Is she going to stay in orbit forever now? (And not get to go home either?)


Rosetta drinks her whisky neat
She gets in a fight and she might get beat
So I go round on the Saturday night
And ask her if she feels alright

Rosetta are you better, are you well, well, well
Rosetta are you better, are you well, well, well
Well, well, well - well, well, well - well, well, well

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Re: 1446: "Landing"

Postby Coyoty » Thu Nov 13, 2014 12:23 am UTC

The Devils Engineer wrote:Is anyone else (like me) still looking for that whale on the surface of the comet? He's there.......right?......... :D

G.


Look for some petunias.

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Re: 1446: "Landing"

Postby azule » Thu Nov 13, 2014 12:54 am UTC

Title text hasn't changed. Maybe this will update throughout the week as those space agency xuys get more info. Please keep watch.

Moose Anus wrote:The sea is cometish.
Yes. Approved.
micdi wrote:H, though
Nah. There were the meteor frames. They're all just space rocks. Or, to paraphrase someone, they're just "space poo". lol.

ucim "Philae Rope.jpg" - hah.

Qalyar - Doubly well-done.

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Re: 1446: "Landing"

Postby project2051 » Thu Nov 13, 2014 1:01 am UTC

Chicagojon wrote:
orthogon wrote:I'm glad I'm not on a live camera feed while I'm doing my job, is all I can say. That, and Wahayyy!


Great job by the ESA in having representative Euro-wear. I love the sweathshirt, jackets with untucked shirts, nice jeans, etc.


I say it's not rocket science without white short sleeve shirts, skinny black ties, and pocket protectors.

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Re: 1446: "Landing"

Postby geekguyandy » Thu Nov 13, 2014 1:39 am UTC

More interesting news from Philae - it bounced multiple times! The sensors detected 3 landings, at 15:33, 17:26 and 17:33 UTC. Notice that nearly two hours passed after the first bounce.

I still can't find anything confirming that it stuck to the surface. With so little gravity, the long bounce time might mean it only moved a meter, or it could be far, far away from the planned site.

The first round of images came back blank or with many black bars, though that camera snapped a good photo on descent.

Hopefully all will be well by tomorrow, but there's an unfortunate chance that it is 1) not where it was planned to land, and 2) not functioning well (cold-gas thruster broken, harpoons broken, foot screws broken, camera broken).

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Re: 1446: "Landing"

Postby serutan » Thu Nov 13, 2014 3:20 am UTC

geekguyandy wrote:More interesting news from Philae - it bounced multiple times! The sensors detected 3 landings, at 15:33, 17:26 and 17:33 UTC. Notice that nearly two hours passed after the first bounce.

I still can't find anything confirming that it stuck to the surface. With so little gravity, the long bounce time might mean it only moved a meter, or it could be far, far away from the planned site.

The first round of images came back blank or with many black bars, though that camera snapped a good photo on descent.

Hopefully all will be well by tomorrow, but there's an unfortunate chance that it is 1) not where it was planned to land, and 2) not functioning well (cold-gas thruster broken, harpoons broken, foot screws broken, camera broken).



The ESA and NASA sites report a successful landing. The BBC reports the bounces, and the belief that it is not anchored. Would be a shame
if it got sloughed off.
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Re: 1446: "???"

Postby Eternal Density » Thu Nov 13, 2014 5:08 am UTC

rivulatus wrote:I refuse to believe that GLR is not going to update this comic again while the title test is still telling me that it is "[LIVE]".
I guess it didn't pass the title test.
edo wrote:
BlitzGirl wrote:I want to watch the deleted scenes, particularly the one where a leopard crashes into Rosetta and diverts it off-course.

I literally LOL'd.
You physically produced the letters L, O, and another L?
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Re: 1446: "Landing"

Postby ucim » Thu Nov 13, 2014 7:18 am UTC

geekguyandy wrote:More interesting news from Philae - it bounced multiple times! The sensors detected 3 landings, at 15:33, 17:26 and 17:33 UTC. Notice that nearly two hours passed after the first bounce.
Given the microgravity, how high a bounce would that be? Could it be instead a sensor malfunction, or a pad not being quite down?

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Re: 1446: "Landing"

Postby Dan H » Thu Nov 13, 2014 8:03 am UTC

ucim wrote:
geekguyandy wrote:More interesting news from Philae - it bounced multiple times! The sensors detected 3 landings, at 15:33, 17:26 and 17:33 UTC. Notice that nearly two hours passed after the first bounce.
Given the microgravity, how high a bounce would that be? Could it be instead a sensor malfunction, or a pad not being quite down?

Jose

This doesn't entirely answer your question, but given the comet's mass and size the gravitational acceleration at its surface should be about 10^-4 m/s^2 (this will vary quite a bit since the comet is asymmetric), and a physics-1 calculation with that value for "g" and a bounce time of 113 minutes yields a maximum height of about 500 meters. This uses a lousy oversimplified model assuming a flat surface, so even if those sensor times are accurate and the gap between the first and second times represented a single huge bounce, at best I've just pegged the approximate order of magnitude of the bounce height.

You could probably obtain an answer from a more accurate model by a quick computer simulation. But I don't trust the interpretation of the first time gap as a single bounce enough to spend the time to do that.

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Re: 1446: "Landing"

Postby Kanonfutter » Thu Nov 13, 2014 8:18 am UTC

Quick and dirty simulation based on mass and assuming start point 2 km from center of mass says about 200 m, with a starting velocity of 0.15 m/s. These are the figures that will hit my high school students for a question this afternoon, seeing that we just finished numerical integration and basic mechanics last week.

BTW, do we have a source for the time between the bounces. I've been searching high and low without getting anything, and I don't recall it being said at the livestream last night.
Last edited by Kanonfutter on Thu Nov 13, 2014 8:26 am UTC, edited 1 time in total.

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Re: 1446: "Landing"

Postby LordHorst » Thu Nov 13, 2014 8:21 am UTC

geekguyandy wrote:They are saying it landed, bounced a little bit because it didn't attach, and landed a second time. So maybe "HAVE WE LANDED ON A COMET:" needs to say "TWICE!"


If a plane hits the ground, then bounces up again, and lands (they do that sometimes, right?) did it land twice? I wouldn't think so.

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Re: 1446: "Landing"

Postby Neil_Boekend » Thu Nov 13, 2014 8:52 am UTC

LordHorst wrote:
geekguyandy wrote:They are saying it landed, bounced a little bit because it didn't attach, and landed a second time. So maybe "HAVE WE LANDED ON A COMET:" needs to say "TWICE!"


If a plane hits the ground, then bounces up again, and lands (they do that sometimes, right?) did it land twice? I wouldn't think so.

While that is correct, a plane is landing on earth. Earth is big and has serious gravity. If a plane bounces once that does not mean it might miss the next time. It's coming down one way or the other.
With Philae that was not so sure. The comet is less than 10 km in size and has very little gravity. Both factors mean that bouncing was really dangerous. I assume they programmed the Philae software to try and land again if it bounces. That software worked. That is an achievement, because many factors were not known.
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Re: 1446: "Landing"

Postby LordHorst » Thu Nov 13, 2014 10:05 am UTC

Neil_Boekend wrote:With Philae that was not so sure. The comet is less than 10 km in size and has very little gravity. Both factors mean that bouncing was really dangerous. I assume they programmed the Philae software to try and land again if it bounces. That software worked. That is an achievement, because many factors were not known.


All of this is true. But the bouncing could be expected (and it was expected). So the bouncing was part of the landing process. It didn't land twice in one landing process. It bounced one (or twice) in one landing process and finished that one landing process successfully.

But since the status report only says: "Did we land on a comet? YES" the status report still is true, no matter if we argue about how many times it did land.
Also: "Has anyone ever tried this before? NOPE" is also correct, which makes the achievement of actually landing on the comet even greater.

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Re: 1446: "Landing"

Postby azule » Thu Nov 13, 2014 10:19 am UTC

Thank you, eidako, for your list. For posterity, the full list in a spoiler. I know the 1446 site has it, but who knows about later.
Spoiler:
http://imgs.xkcd.com/comics/landing/r_00-00-00_8MxxPSiNYx.png
http://imgs.xkcd.com/comics/landing/r_00-05-00_KsvXIwq84J.png
http://imgs.xkcd.com/comics/landing/r_00-10-00_fUWUYNkxwp.png
http://imgs.xkcd.com/comics/landing/r_00-15-00_74eSd3x7BQ.png
http://imgs.xkcd.com/comics/landing/r_00-20-00_UT4FKycrmC.png
http://imgs.xkcd.com/comics/landing/r_00-25-00_FX6hlfSQHR.png
http://imgs.xkcd.com/comics/landing/r_00-30-00_FjnXADopvO.png
http://imgs.xkcd.com/comics/landing/r_00-35-00_lVC98SMY1X.png
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http://imgs.xkcd.com/comics/landing/r_00-45-00_MZprhbADHL.png
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http://imgs.xkcd.com/comics/landing/r_01-05-00_Os6SVGalch.png
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http://imgs.xkcd.com/comics/landing/r_01-25-00_ADajYkIBoR.png
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http://imgs.xkcd.com/comics/landing/r_04-05-00_ZKoWCrw6iB.png
http://imgs.xkcd.com/comics/landing/r_04-10-00_GFIr1zPjmc.png
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http://imgs.xkcd.com/comics/landing/r_11-05-00_bLSCTYXxmg.png
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http://imgs.xkcd.com/comics/landing/r_11-40-00_4VokwrsMkd.png
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http://imgs.xkcd.com/comics/landing/r_15-15-00_h5wbb6byZh.png
http://imgs.xkcd.com/comics/landing/r_15-20-00_JWDUJvUT2O.png
http://imgs.xkcd.com/comics/landing/r_15-25-00_QQZZrjzRfR.png
http://imgs.xkcd.com/comics/landing/r_15-30-00_n3FmVbsd8O.png
http://imgs.xkcd.com/comics/landing/r_15-35-00_HN9pEceSNq.png
http://imgs.xkcd.com/comics/landing/r_15-40-00_t5MhSYQ6UE.png
http://imgs.xkcd.com/comics/landing/r_15-45-00_00sn21iRyi.png
http://imgs.xkcd.com/comics/landing/r_15-50-00_cFks3Ycc7A.png
http://imgs.xkcd.com/comics/landing/r_15-55-00_fbGux9Rqtg.png
http://imgs.xkcd.com/comics/landing/r_16-00-00_rmyLlIdOnH.png
http://imgs.xkcd.com/comics/landing/r_16-05-00_5tOXgmw34m.png
http://imgs.xkcd.com/comics/landing/r_16-10-00_PcWHdMRG9W.png
http://imgs.xkcd.com/comics/landing/r_16-15-00_LNTu3py0Zu.png
http://imgs.xkcd.com/comics/landing/r_16-20-00_5kNwJ7gpN2.png
http://imgs.xkcd.com/comics/landing/r_16-25-00_MZ7aAUNWN5.png
http://imgs.xkcd.com/comics/landing/r_16-30-00_yzSUwWrLR7.png
http://imgs.xkcd.com/comics/landing/r_16-35-00_AvjxRtJO4G.png
http://imgs.xkcd.com/comics/landing/r_16-40-00_NfbEBFUw0W.png
http://imgs.xkcd.com/comics/landing/r_16-45-00_oAhSqIi56i.png
http://imgs.xkcd.com/comics/landing/r_16-50-00_XPPONIRJaJ.png
http://imgs.xkcd.com/comics/landing/r_16-55-00_bD01qtUkFk.png
http://imgs.xkcd.com/comics/landing/r_17-00-00_asLLfEVzOA.png
http://imgs.xkcd.com/comics/landing/r_17-05-00_FagcS2rsZm.png
http://imgs.xkcd.com/comics/landing/r_17-10-00_jxclbog8sI.png
http://imgs.xkcd.com/comics/landing/r_17-15-00_jx7ENjy6ac.png
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Re: 1446: "Landing"

Postby LordHorst » Thu Nov 13, 2014 10:40 am UTC

Do we already have the link to the nytimes here? If not, here it is. If yes, it doesn't hurt to link it more than once, since it offers many nice pics.

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Re: 1446: "Landing"

Postby Flotter » Thu Nov 13, 2014 10:42 am UTC

First pics from the surface!

Image

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Re: 1446: "Landing"

Postby orthogon » Thu Nov 13, 2014 11:19 am UTC

I know there's not much gravity, but which way is "up"?
xtifr wrote:... and orthogon merely sounds undecided.

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Re: 1446: "Landing"

Postby manvandmaan » Thu Nov 13, 2014 11:21 am UTC

Maybe it's better that the harpoons didn't work. Can you imagine the conversations on the next Space-Con1?

NASA: We put a man on the moon
NASA: We put robots on MARS
NASA: We put a spacecraft outside the limits of our solar system.
ESA: Pfuh, we shot a comet.
NASA: With lasers?
ESA: NO, you NERD! 't were harpoons we utilized! Harrr!


1 that's probably a thing, right?2
2 Pretty sure it is.
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Re: 1446: "Landing"

Postby Xenocat » Thu Nov 13, 2014 11:34 am UTC

Pfhorrest wrote:
Flumble wrote:
Envelope Generator wrote:I just noticed there's still one whale in there. It is HIDING! But it is not so smart!

Why does that phrase sound so familiar?

I thought that sounded familiar too. I feel like Björk said it in a previous xkcd, but I can't figure out which one.


Spoiler:
Image

Someone round here has that gif as their avatar, but I can't remember who.

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Re: 1446: "Landing"

Postby Flumble » Thu Nov 13, 2014 11:42 am UTC

Pfhorrest wrote:
Flumble wrote:
Envelope Generator wrote:I just noticed there's still one whale in there. It is HIDING! But it is not so smart!

Why does that phrase sound so familiar?

I thought that sounded familiar too. I feel like Björk said it in a previous xkcd, but I can't figure out which one.

Oh right, it was part of the .gif telephone conversation between Björk and P. Diddy that someone here has/had as an avatar.


pseudo edit: hey, no ninja'ing while I'm looking everywhere to find the person with that avatar!

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Re: 1446: "Landing"

Postby Klear » Thu Nov 13, 2014 11:47 am UTC

orthogon wrote:I know there's not much gravity, but which way is "up"?


Opposite direction from the inside, which is the assumed region in the middle of the comet's outside.

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Re: 1446: "Landing"

Postby balthasar_s » Thu Nov 13, 2014 11:52 am UTC

That was the avatar of SecondTalon, (http://moonbase.chirpingmustard.com/ott/avatar/9592_1397004609.gif) but it's changed now.
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Re: 1446: "Landing"

Postby orthogon » Thu Nov 13, 2014 12:28 pm UTC

balthasar_s wrote:That was the avatar of SecondTalon, (http://moonbase.chirpingmustard.com/ott/avatar/9592_1397004609.gif) but it's changed now.

Speaking of avatars, would a "safety bicycle" like yours work on the moon? Or would it be better to go for something more like a penny farthing?
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Re: 1446: "Landing"

Postby Xserenz » Thu Nov 13, 2014 12:41 pm UTC

Some facts from a CNES video (in french) :

• It is transmitting data, which means that in its current orientation, it has radio contact with Rosetta.
• Philae bounced two times, and then stabilized in a rocky area (far away from the planned landing site).
• It is resting at an angle with respect to the "ground" (perhaps in a cliff), with some cameras facing the sky (space) and some others facing the ground.
• It is not anchored to the ground (harpoons probably didnt fire, leg screws didnt stick into anything)
• Although not anchored, it is stable and will remain stable for the time being (comet activity is low, no strong gas jets)
• Solar expostion is much lower in this area than in the planned landing site : the battery wont be able to charge as much. Expected battery life is about 50 hours in the current conditions.
• Philae will probably not be able to use its drill or any other mechanical device : action-reaction could change its orientation (thus breaking radio contact) or even send him back to space.
• However, they are receiving "breakthrough" data from the other sensors. Considering the odds of landing a robot on a comet, that's already quite something and they are thrilled about it (and they should be !).

Check the press conference at 13H00 GMT / 14h00 CET on the ESA website.

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Re: 1446: "Landing"

Postby cellocgw » Thu Nov 13, 2014 1:27 pm UTC

Flumble wrote:I'm a bit late to the party, but: YAY, the comet attached to Philae successfully! :D

Envelope Generator wrote:I just noticed there's still one whale in there. It is HIDING! But it is not so smart!

Why does that phrase sound so familiar?


You're probably channeling Monty Python's skit :D
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Re: 1446: "Landing"

Postby ucim » Thu Nov 13, 2014 1:44 pm UTC

Thanks for the rough bounce calculation Dan H and Kanonfutter. I suspected it was something like that. A two hour bounce just doesn't sound right given the way I'd expect the landing gear to be designed, the existence of down thrusters, and the six hour original trajectory. I'd expect a few minutes, tops. But I'm not a rocket scientist.

In any case, a plane "bouncing" on earth isn't really bouncing; it's flying. The wings are providing most of the lifting force and the rise is primarily due to the change in attitude (angle of attack) of the wing. It's a problem because the airplane is also slowing down, using up runway, and is becoming closer to a stall high above the runway rather than down close. If Philae bounces, it's a real bounce.

And no, we don't log extra landings on a bounce (though we joke about it).

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Re: 1446: "Landing"

Postby pinkgothic » Thu Nov 13, 2014 2:15 pm UTC

Drifting one kilometre and landing a second (and third) time is pretty crazy.

Very curious how this comic will update (if it will) to adjust to the new information! :) The landing site looks very different, after all, so there's that, at least, and I imagine the solar energy situation is probably something Philae is worried about... :shock:
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Re: 1446: "Landing"

Postby Klear » Thu Nov 13, 2014 2:29 pm UTC

pinkgothic wrote:Drifting one kilometre and landing a second (and third) time is pretty crazy.

Very curious how this comic will update (if it will) to adjust to the new information! :) The landing site looks very different, after all, so there's that, at least, and I imagine the solar energy situation is probably something Philae is worried about... :shock:


I'm sure Philae is still proud, possibly brave. There's not enough room for worries in the status window.

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Re: 1446: "Landing"

Postby pinkgothic » Thu Nov 13, 2014 2:38 pm UTC

Klear wrote:I'm sure Philae is still proud, possibly brave. There's not enough room for worries in the status window.


That's very true!

Does someone know where I can rewatch the stream of the media briefing? I missed out on about ten minutes of it because the stream cut out for me and no tricks let me get it working again, and now I can't seem to find the archive of it, neither on the livestream.com site nor on rosetta.esa.int. (I'll be unsurprised if it's somewhere obvious and I still managed to miss it.) And the moment I ask, it appears on livestream.com for me. Nevermind!

(Link for others: Archive of live stream.)
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Re: 1446: "Landing"

Postby Dracomax » Thu Nov 13, 2014 2:56 pm UTC

Xserenz wrote:Some facts from a CNES video (in french) :

• It is transmitting data, which means that in its current orientation, it has radio contact with Rosetta.
• Philae bounced two times, and then stabilized in a rocky area (far away from the planned landing site).
• It is resting at an angle with respect to the "ground" (perhaps in a cliff), with some cameras facing the sky (space) and some others facing the ground.
• It is not anchored to the ground (harpoons probably didnt fire, leg screws didnt stick into anything)
• Although not anchored, it is stable and will remain stable for the time being (comet activity is low, no strong gas jets)
• Solar expostion is much lower in this area than in the planned landing site : the battery wont be able to charge as much. Expected battery life is about 50 hours in the current conditions.
• Philae will probably not be able to use its drill or any other mechanical device : action-reaction could change its orientation (thus breaking radio contact) or even send him back to space.
• However, they are receiving "breakthrough" data from the other sensors. Considering the odds of landing a robot on a comet, that's already quite something and they are thrilled about it (and they should be !).

Check the press conference at 13H00 GMT / 14h00 CET on the ESA website.

Awfulsome infromation. Out of curiosity, do you know if, when the comet approaches the sun and the composition of the COmet begins to change, if solar exposure becomes greater, it could cause Philae to reactivate?
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Re: 1446: "Landing"

Postby flamewise » Thu Nov 13, 2014 3:24 pm UTC

Looks like it's already about as close as it ever gets to the sun, which is probably because it's easiest to rendezvous it there coming from Earth.

Additionally, if it gets too close it may get hot enough to sprout a comet tail, which would worry Philae a lot.

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Re: 1446: "Landing"

Postby Klear » Thu Nov 13, 2014 3:54 pm UTC

flamewise wrote:Looks like it's already about as close as it ever gets to the sun, which is probably because it's easiest to rendezvous it there coming from Earth.

Additionally, if it gets too close it may get hot enough to sprout a comet tail, which would worry Philae a lot.


Check out this gif posted by Moose Anus:
Image

Seems like the probe closed up on the comet about as far from the sun as it gets, and the comet will get a lot closer still.

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Re: 1446: "Landing"

Postby kenmelken » Thu Nov 13, 2014 4:03 pm UTC

Klear wrote:
flamewise wrote:Looks like it's already about as close as it ever gets to the sun, which is probably because it's easiest to rendezvous it there coming from Earth.

Additionally, if it gets too close it may get hot enough to sprout a comet tail, which would worry Philae a lot.


Spoiler:
Check out this gif posted by Moose Anus:
Image

Seems like the probe closed up on the comet about as far from the sun as it gets, and the comet will get a lot closer still.


Indeed. I understood that it would make its closest approach in March, though now I can't find where I read that, and this gif to me suggests it should be even a bit further out than that.
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Re: 1446: "Landing"

Postby Xserenz » Thu Nov 13, 2014 4:20 pm UTC

As they said in the briefing : when battery gets too low, Philae will enter hibernation mode. Months after that, as the comet orientation changes so that Philae gets more sun, it is possible that it gets enough energy to reactivate for some time. But this has a really low probability, so they cannot rely on it and instead they are focusing on getting as much data as they can during the next hours.

They will also maybe try to re-orient or move Philae so that it gets more sun, but this is a risky maneuver and will only be attempted after the critical experiments have been done.

Next briefing tomorrow 14h00 CET.

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Re: 1446: "Landing"

Postby Jackpot777 » Thu Nov 13, 2014 4:33 pm UTC

LordHorst wrote:
geekguyandy wrote:They are saying it landed, bounced a little bit because it didn't attach, and landed a second time. So maybe "HAVE WE LANDED ON A COMET:" needs to say "TWICE!"


If a plane hits the ground, then bounces up again, and lands (they do that sometimes, right?) did it land twice? I wouldn't think so.


Image

From this news article on the BBC site.

Booooiiiinnngggggggg!

The comic may need to be corrected to show Philae coming back up ("wait, I think I left the gas on!", etc.) and down and a tiny bounce ("oo, I feel ill...") before finally settling near a cliff.

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Re: 1446: "Landing"

Postby geekguyandy » Thu Nov 13, 2014 5:37 pm UTC

In the briefing they said that the first bounce (of nearly 2 hours) launched the craft up about 1km from the landing site, and because of the rotation of 67P and the angle of bounce, it translated about 1km away from the landing site. It initially hit at 1m/s (as planned) but the cold-gas thruster, harpoon system, and grappling system in the feet all failed, and the bounce resulted in a rebound of 38cm/s.

The second bounce was only 3cm/s for 7 minutes, without much more movement. It now rests on it's side with one foot up. The batteries were in two systems - one which is sufficient for all the initial science data, and another that relies on solar power to extend the mission by several months, but they now fear that the final resting place next to a cliff wall will only provide 1.5hrs sun/day compared to the 6hr/day the planned landing site would have provided.

The good news - "Engineers are studying whether they can order Philae to use deployable mechanisms — such as a drilling system or harpoon anchors that did not fire during Wednesday’s descent." Here's to hoping that the harpoons can save Philae!


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