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djellison
Posted on: Sep 23 2012, 09:08 PM


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QUOTE (vikingmars @ Sep 23 2012, 03:50 AM) *
It's a real pity...


Whats a pity? The middle of the ring magnet is rather clean. That's the point of them.

  Forum: MSL · Post Preview: #191986 · Replies: 529 · Views: 461044

djellison
Posted on: Sep 18 2012, 07:31 PM


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QUOTE (Ant103 @ Sep 18 2012, 08:41 AM) *
but for me, it's a total mistake to stretch picture like this. And come one, the previous ones were no so dark…


Given that the primary purpose of these images is for people to look at them as they are, without photoshop to stretch them - they have done the right thing.

Many of the previous images were too dark.

http://mars.jpl.nasa.gov/msl/multimedia/ra...0424M_&s=40
http://mars.jpl.nasa.gov/msl-raw-images/pr...NCAM00418M_.JPG
http://mars.jpl.nasa.gov/msl-raw-images/pr...NCAM00302M_.JPG
http://mars.jpl.nasa.gov/msl-raw-images/pr...NCAM00417M_.JPG

These images would be 'better' for people to look at with the newer stretch. Yes - we get clipping at each end as a result, but the image occupies a larger part of the histogram and, combined with lower compression, is far better for people to actually look at.
  Forum: MSL · Post Preview: #191686 · Replies: 529 · Views: 461044

djellison
Posted on: Sep 17 2012, 06:41 AM


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Every MARDI frame of landing IS down. How do you think he made that video, or indeed the versions that JPL have released?
  Forum: MSL · Post Preview: #191598 · Replies: 370 · Views: 290187

djellison
Posted on: Sep 17 2012, 04:58 AM


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Wow - a load of fuss over a bit of photoshop in half a second of video.
  Forum: MSL · Post Preview: #191595 · Replies: 370 · Views: 290187

djellison
Posted on: Sep 16 2012, 03:12 PM


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QUOTE (akuo @ Sep 16 2012, 08:08 AM) *
Is anybody attempting to map Curie's positions on sol 39&40?


Obviously the team at JPL are doing just that, and the amateur efforts will appear here when people have had the time to figure it out
http://www.unmannedspaceflight.com/index.p...20&start=20
  Forum: MSL · Post Preview: #191557 · Replies: 587 · Views: 801618

djellison
Posted on: Sep 16 2012, 03:11 PM


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QUOTE (tanjent @ Sep 16 2012, 01:09 AM) *
At the end of the Canning video as the camera elevates to take in "Mt. Sharp" it appears that the mountain is dwarfed by the crater wall behind it.


What do you mean? It's just the MastCam mosaic from Bradbury landing. Nothing looks out of place.
  Forum: MSL · Post Preview: #191556 · Replies: 370 · Views: 290187

djellison
Posted on: Sep 16 2012, 07:04 AM


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Blue filters on a bayer filter can often be nIR transparent.
  Forum: MSL · Post Preview: #191544 · Replies: 529 · Views: 461044

djellison
Posted on: Sep 14 2012, 09:35 PM


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QUOTE (Phil Stooke @ Sep 14 2012, 01:12 PM) *
It's a mistake to think of MSL as RTG powered. Like MER it is really battery powered. The RTG just trickles power into the batteries. (as I understand it, and really I'm just repeating others here - I think Doug said pretty much exactly this).


Exactly that. It consumes more than 110Watts to 'run' the rover - and some activities use much much more than that. You use up battery power during the day, and then recharge with the RTG over night.

QUOTE (MahFL)
What happened to Pete ?, as I see on the MSL website Cook is now the MSL Project Manager.


That information is probably out of date. Richard was MSL ProjMang for a while a few years back as Pete had some medical issues to deal with. Then Pete took the position again. At the moment, it's still Pete at the top and Richard as his deputy.
  Forum: MSL · Post Preview: #191434 · Replies: 587 · Views: 801618

djellison
Posted on: Sep 14 2012, 06:03 PM


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QUOTE (akuo @ Sep 13 2012, 10:35 PM) *
200 metres per sol is the original engineering goal for MSL, that has been mentioned in various sources.


I've never seen figures that high quoted anywhere. Where do you get that number from?
  Forum: MSL · Post Preview: #191405 · Replies: 587 · Views: 801618

djellison
Posted on: Sep 9 2012, 03:19 AM


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'Eyes...' has nothing for surface operations. We intend to replace the EDL trajectory with a reconstructed trajectory of actual events in a few weeks time when the team's had a chance to process all that data.
  Forum: MSL · Post Preview: #190960 · Replies: 370 · Views: 290187

djellison
Posted on: Sep 8 2012, 09:41 PM


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QUOTE (spacepoint @ Sep 8 2012, 02:11 AM) *
As i understand correct, during live stream, Eyes used real telemetry data from vehicle for the graphic presentation of whole EDL sequence.


No, it didn't. It was a predict from 3 weeks before landing. There was a realtime visualization via Mars Odyssey telemetry - but it wasn't Eyes on the Solar System and it updated at something under 1hz.

D
  Forum: MSL · Post Preview: #190948 · Replies: 370 · Views: 290187

djellison
Posted on: Sep 7 2012, 09:59 PM


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QUOTE (DeanM @ Sep 7 2012, 12:26 AM) *
Were the flight/control software + harware designed to handle failure or non-ignition of one (or more) MLE when all 8 were initially needed?

Or would that have resulted in too much assymmetric thrust?


It would have resulted in failure. They needed that thrust.
  Forum: MSL · Post Preview: #190879 · Replies: 199 · Views: 178815

djellison
Posted on: Sep 7 2012, 04:21 PM


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The problem with the thrust/acceleration problem is that you're not exactly sure what the performance of the thrusters is any more. It's uncertainty is probably more than our fuel uncertainty. F=MA and all that...but while IMU's will give you A, F has error bars that then induce errors in M.

The thermal inertia idea is one that's been put out there as an option for Cassini as well.
  Forum: Exploration Strategy · Post Preview: #190835 · Replies: 19 · Views: 35631

djellison
Posted on: Sep 7 2012, 02:23 PM


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Oh - glad something got published on that - thanks for the ref Mike.
  Forum: Exploration Strategy · Post Preview: #190822 · Replies: 19 · Views: 35631

djellison
Posted on: Sep 7 2012, 01:53 PM


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The challenges on keeping track on the exact amount of fuel remaining was one of the reasons why the burned Stardust to depletion when they switched it off...to find out exactly how much was left compared to their various means of measuring it. It's not easy.
  Forum: Exploration Strategy · Post Preview: #190817 · Replies: 19 · Views: 35631

djellison
Posted on: Sep 6 2012, 10:41 PM


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QUOTE (Eyesonmars @ Sep 6 2012, 02:25 PM) *
Not sure where to put this question but here goes ...
Could the brush on the arm be used to clean the dust off the rover (cameras, instruments, etc) if need be ?


I would not do that. It's an abrasive tool. It would do far more harm than good.
  Forum: MSL · Post Preview: #190784 · Replies: 252 · Views: 429901

djellison
Posted on: Sep 6 2012, 09:55 PM


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In a talk by Marc last week for the EPO folk on lab - he echoed what you describe Floyd. Marz - I think you have things wrong.
  Forum: Dawn · Post Preview: #190776 · Replies: 68 · Views: 177158

djellison
Posted on: Sep 6 2012, 08:22 PM


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QUOTE (Sarunia @ Sep 6 2012, 12:31 PM) *
I think that the administrators of "Eyes of Solar System" and others just didn't updated the new data.


Correct - we just don't have the time.
  Forum: Dawn · Post Preview: #190769 · Replies: 68 · Views: 177158

djellison
Posted on: Sep 6 2012, 08:21 PM


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QUOTE (ddeerrff @ Sep 6 2012, 08:37 AM) *
What is that dark area moving across the backshell (5 o'clock - 4 o'clock positions)? Almost looks like a very slow moving cloud.



Just changing lighting conditions. It would have to be one heck of a cloud to move like that over a 12 day period.
  Forum: MSL · Post Preview: #190768 · Replies: 199 · Views: 178815

djellison
Posted on: Sep 6 2012, 05:06 PM


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QUOTE (Explorer1 @ Sep 6 2012, 09:55 AM) *
now would be a good time to ask about the possibility of self-portraits.


We already know the answer. They're going to do it at some point.

During a first-time checkout of instruments is not the time.
  Forum: MSL · Post Preview: #190731 · Replies: 252 · Views: 429901

djellison
Posted on: Sep 6 2012, 01:14 AM


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That paper is slightly outdated. I believe the throttle level ended up being 60% ( about twice what it was during the hover phase...which is actually a continual .75m/sec downward motion of the descent stage toward the ground ) And it ran for approx 6 seconds.

D
  Forum: MSL · Post Preview: #190689 · Replies: 199 · Views: 178815

djellison
Posted on: Sep 6 2012, 01:11 AM


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No motion between +6 and +12 sols.
  Forum: MSL · Post Preview: #190688 · Replies: 199 · Views: 178815

djellison
Posted on: Sep 5 2012, 09:44 PM


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So - time warp for a thread time but...

http://www.planetary.org/blogs/emily-lakda.../2008/1673.html

In that awesome article, Emily mentioned that it would need to be reactivated in 2012 for a 2014 recapture.

Any news on that? I've heard nothing.
  Forum: Cometary and Asteroid Missions · Post Preview: #190670 · Replies: 91 · Views: 140049

djellison
Posted on: Sep 5 2012, 09:35 PM


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QUOTE (Joffan @ Sep 5 2012, 12:23 PM) *
but isn't the test (driving) rover specially lightened to compensate for that?


The Scarecrow rover yes.
http://www.flickr.com/photos/planetaryblog/7197573662/


VSTB, no.
http://photojournal.jpl.nasa.gov/catalog/PIA15876

(Some of my own photos of the VSTB are here : http://dougellison.smugmug.com/Machines/Ma...9&k=ZnpCztC )
  Forum: MSL · Post Preview: #190669 · Replies: 313 · Views: 278336

djellison
Posted on: Sep 5 2012, 07:55 PM


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Regarding wheel damage....the VSTB (test rover) is effectively 3x too heavy for its wheels....it's eaten its way thru a set already and they've been replaced with an extra beefy set.

There will be dings and dents on the wheels on Mars, but I wouldn't expect anything as bad as is in that video.
  Forum: MSL · Post Preview: #190658 · Replies: 313 · Views: 278336

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