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MahFL
Posted on: Nov 14 2014, 02:49 PM


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QUOTE (spacepoint @ Nov 14 2014, 03:18 PM) *
She also said maybe in august next year will be a chance to wake him up(?)


Yes August 2015 is when the comet is closest to the Sun. The mission has 1 or maybe 2 more years to run. The lander is one small complimentary part to the whole mission.
  Forum: Rosetta · Post Preview: #215206 · Replies: 1412 · Views: 1230866

MahFL
Posted on: Nov 14 2014, 02:43 PM


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QUOTE (jman0war @ Nov 14 2014, 03:39 PM) *
any speculation on why the thrusters and harpoons failed?


They don't know yet. That can take low priority as they are collecting science right now.
  Forum: Rosetta · Post Preview: #215205 · Replies: 1412 · Views: 1230866

MahFL
Posted on: Nov 14 2014, 02:42 PM


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QUOTE (xflare @ Nov 14 2014, 03:06 PM) *
How serious are they about trying the hopping?


They are considering it, but they might have to wait a few weeks or months to get enough battery power, IF they do not use the last few amp hours to do a hop. But I think they are running out of power, they say even tonight's comm link is doubtful, which seems a bit earlier than expected. Also they said a command to enter low power operations failed to get to the lander. I think the battery warming is taking more power as they only have 1 hour 20 mins of sunlight per comet day.
  Forum: Rosetta · Post Preview: #215204 · Replies: 1412 · Views: 1230866

MahFL
Posted on: Nov 14 2014, 02:37 PM


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QUOTE (Marvin @ Nov 14 2014, 03:24 PM) *
It's ironic that they had triple redundancy, but the thrusters then the harpoons failed. I don't know if the leg screws even deployed.


The leg screws are automatic, when the landing gear pads hit the surface the screws rotate, but without the gas thruster pushing down and the nature of the ground the ice screws did not hold. I doubt on the second and third landing the downward velocity would be enough to turn the screws. The screws do not have an electric motor, it's a pulley system powered by the downward motion of landing.
  Forum: Rosetta · Post Preview: #215200 · Replies: 1412 · Views: 1230866

MahFL
Posted on: Nov 14 2014, 01:44 PM


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Oh yes I thought myself the shirt was completely inappropriate for the occasion. But then again he has his own tastes and personality.
  Forum: Rosetta · Post Preview: #215195 · Replies: 1412 · Views: 1230866

MahFL
Posted on: Nov 14 2014, 01:41 PM


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QUOTE (jman0war @ Nov 14 2014, 02:32 PM) *
Have they actually identified the location of the lander?
Last thing I read is that they were going to try some triangulation.

Also are they decided that the lander is up against a cliff?
Some believe it's in a hole, so moving the lander a little may not accomplish much.


They have not yet located the lander on pictures.
My impression is the legs can launch the lander quite high above the surface.
  Forum: Rosetta · Post Preview: #215194 · Replies: 1412 · Views: 1230866

MahFL
Posted on: Nov 14 2014, 01:27 PM


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The solar panel lady says they might indeed try to hop out of the "corner" they are in.
  Forum: Rosetta · Post Preview: #215191 · Replies: 1412 · Views: 1230866

MahFL
Posted on: Nov 14 2014, 01:20 PM


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How did Matt insult a bunch of people ?

ADMIN: We don't need to discuss that here. Thanks.
  Forum: Rosetta · Post Preview: #215190 · Replies: 1412 · Views: 1230866

MahFL
Posted on: Nov 14 2014, 01:12 PM


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They will use the drill and ovens, but might not have enough battery left to transmit the results.
  Forum: Rosetta · Post Preview: #215189 · Replies: 1412 · Views: 1230866

MahFL
Posted on: Nov 14 2014, 01:07 PM


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The audio of the hangout is not too good, lots of echo's sad.gif.
  Forum: Rosetta · Post Preview: #215188 · Replies: 1412 · Views: 1230866

MahFL
Posted on: Nov 14 2014, 11:46 AM


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QUOTE (Jorn Barger @ Nov 14 2014, 10:21 AM) *
some real basic questions:

wasn't it expected that the surface of 67p would be mostly water-ice..


No, they already knew it was a dark dust covered comet before they arrived. It is in fact blacker than coal. They have also said small grains have been observed by ORSIS floating away from the comet surface and re-landing. Also it's shedding more and more water as it closes in on the Sun.
  Forum: Rosetta · Post Preview: #215183 · Replies: 1412 · Views: 1230866

MahFL
Posted on: Nov 14 2014, 11:35 AM


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They have already stated they want to follow the comet during 2016, as it enters the dormant state. They would need a mission extension for that.
  Forum: Rosetta · Post Preview: #215181 · Replies: 390 · Views: 451387

MahFL
Posted on: Nov 13 2014, 04:54 PM


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From a video I saw the force that drives the screws in is from the pads hitting the ground, if that is correct, then sliding down a cliff face won't make the ice screws work, will it ?
Of course I just remembered the first big bounce it did, of which right now no one can say for sure why that happened.
  Forum: Rosetta · Post Preview: #215094 · Replies: 1412 · Views: 1230866

MahFL
Posted on: Nov 13 2014, 04:14 PM


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From this lander orientation image it appears to me the lander is resting with it's base against a cliff.


  Forum: Rosetta · Post Preview: #215086 · Replies: 1412 · Views: 1230866

MahFL
Posted on: Nov 13 2014, 03:06 PM


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QUOTE (TheAnt @ Nov 13 2014, 03:52 PM) *
I have the impression it is leaning but wedged in place.


Ha ha, no need for harpoons, just wedge yourself into a crevice.
  Forum: Rosetta · Post Preview: #215068 · Replies: 1412 · Views: 1230866

MahFL
Posted on: Nov 13 2014, 01:31 PM


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They are going to move Rosetta to a better orbit for Philae communications, one burn has already been made.
  Forum: Rosetta · Post Preview: #215053 · Replies: 1412 · Views: 1230866

MahFL
Posted on: Nov 13 2014, 12:08 PM


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On the science front the ground looks like it's subject to a lot of freeze/thaw fracturing.
  Forum: Rosetta · Post Preview: #215042 · Replies: 1412 · Views: 1230866

MahFL
Posted on: Nov 13 2014, 12:03 PM


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QUOTE (jamescanvin @ Nov 13 2014, 12:58 PM) *
I imagine that there will be thermal issues even if they can somehow stay alive with such little power.


But as they get closer to the Sun it's going to warm up right ?
  Forum: Rosetta · Post Preview: #215040 · Replies: 1412 · Views: 1230866

MahFL
Posted on: Nov 13 2014, 11:54 AM


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QUOTE (Rakhir @ Nov 13 2014, 12:35 PM) *
Forgot to add that they also said that the lander ended in a kind of cave, so really not the perfect location for sunlight.



Probably up against a cliff, rather than inside a cave, and the shadow of the cliff is a problem. Won't the 1.5 hours of sunlight allow some battery recharging ?
  Forum: Rosetta · Post Preview: #215037 · Replies: 1412 · Views: 1230866

MahFL
Posted on: Nov 13 2014, 11:31 AM


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QUOTE (Rakhir @ Nov 13 2014, 12:12 PM) *
CNES :
- travelled 1km from initial landing site


That's nearly a 1/4 of the whole comet.
  Forum: Rosetta · Post Preview: #215027 · Replies: 1412 · Views: 1230866

MahFL
Posted on: Nov 13 2014, 11:29 AM


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QUOTE (Rakhir @ Nov 13 2014, 12:22 PM) *
A ROLIS image will be displayed this afternoon showing the lander didn't dug in the ground.
About 30 cm above ground.


Do you mean the main body is 30 cm above the ground ?
  Forum: Rosetta · Post Preview: #215026 · Replies: 1412 · Views: 1230866

MahFL
Posted on: Nov 13 2014, 11:26 AM


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QUOTE (Rakhir @ Nov 13 2014, 12:12 PM) *
CNES :
... 1h30 available sun per 12h rotation period



That's not good, but at least the lander is alive and on the surface. They needed a lot of luck and they got SOME luck.
  Forum: Rosetta · Post Preview: #215024 · Replies: 1412 · Views: 1230866

MahFL
Posted on: Nov 12 2014, 08:05 PM


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QUOTE (mrpotatomoto @ Nov 12 2014, 08:58 PM) *
Is there any reason why these have not been officially released yet?...

They said images would be released if there was no obviois new science discovery in the images, and the PI owner agreed.
  Forum: Rosetta · Post Preview: #214923 · Replies: 1412 · Views: 1230866

MahFL
Posted on: Nov 12 2014, 06:05 PM


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If it landed in the middle of the image then it looks like a nice flat spot, with cliffs to the right.
  Forum: Rosetta · Post Preview: #214873 · Replies: 1412 · Views: 1230866

MahFL
Posted on: Nov 12 2014, 05:53 PM


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QUOTE (mmatessa @ Nov 12 2014, 05:47 PM) *
ROLIS image from Rosetta


What is that at the top right ?
  Forum: Rosetta · Post Preview: #214871 · Replies: 1412 · Views: 1230866

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