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djellison
Posted on: Oct 5 2012, 07:33 AM


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Note the wording of the press briefing has no certainty whatsoever that any XXM might be approved. This burn simply preserves the option.

AFAIK - an XXM is yet to be approved..
  Forum: Cometary and Asteroid Missions · Post Preview: #192800 · Replies: 378 · Views: 339596

djellison
Posted on: Oct 4 2012, 11:57 PM


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Exacly like fine flour, cornflour, talc, exceptionally fine grained dry material.

  Forum: MSL · Post Preview: #192784 · Replies: 520 · Views: 732940

djellison
Posted on: Oct 4 2012, 10:10 PM


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Contour - no - but there is this - http://photojournal.jpl.nasa.gov/jpeg/PIA16158.jpg
You could have found it by going to the first page under 'Mars' on the photojournal.
  Forum: MSL · Post Preview: #192776 · Replies: 294 · Views: 379886

djellison
Posted on: Oct 4 2012, 09:34 PM


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Yes - the full size is here : http://www.nasa.gov/images/content/692127m...9-full_full.jpg

I find the NASA HQ websites very hard to navigate so I tend to use the photojournal where you'll find it also

http://photojournal.jpl.nasa.gov/catalog/PIA16159

(PS Base map from Fred Calef, annotation by me )
  Forum: MSL · Post Preview: #192771 · Replies: 294 · Views: 379886

djellison
Posted on: Oct 4 2012, 01:14 AM


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QUOTE (renee @ Oct 3 2012, 04:12 PM) *
Thar being the case, isn't the'surface" pretty unexpected?


Look identical to similar exercises at Gusev and Meridiani.
  Forum: MSL · Post Preview: #192740 · Replies: 520 · Views: 732940

djellison
Posted on: Oct 2 2012, 11:40 PM


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I used to maintain one at CafePress - but the quality of the products wasn't something I was especially happy with so I culled it. The effort in setting it up really didn't justify the tiny tiny revenue it generated.
  Forum: Forum News · Post Preview: #192661 · Replies: 59 · Views: 144280

djellison
Posted on: Oct 2 2012, 11:40 PM


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I want to thank Helvick for his hard work. The new server is breathtakingly snappy and should be a great home for UMSF for many many years to come!

  Forum: Forum Maintenance · Post Preview: #192660 · Replies: 11 · Views: 29029

djellison
Posted on: Oct 1 2012, 09:09 PM


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Beautiful work mshell - that you very much ( and GREAT first post!! ) - that shows the tiny wedge so very well.

  Forum: MSL · Post Preview: #192564 · Replies: 150 · Views: 169790

djellison
Posted on: Oct 1 2012, 02:33 PM


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QUOTE (Actionman @ Oct 1 2012, 03:58 AM) *
And the cycle of water distribution goes outside their area of expertise.


There are FOUR HUNDRED scientists on the MSL team. Four hunded of them. There are spectroscopist, biologists, sedementoligists, meteorologists, geologists, mineralologists, hydrologists and dozens of other disciplines in between.

'outside their area of expertise'? I can guarantee you that for several of them - that's exactly their area of expertise.
  Forum: MSL · Post Preview: #192522 · Replies: 587 · Views: 801618

djellison
Posted on: Oct 1 2012, 04:14 AM


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Count me down for some pink Tutu action tongue.gif
  Forum: Forum News · Post Preview: #192501 · Replies: 59 · Views: 144280

djellison
Posted on: Oct 1 2012, 04:13 AM


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QUOTE (Eyesonmars @ Sep 30 2012, 05:36 PM) *
On one designed for Martian use the "tiny wedge" will occupy a whole page.


Yes it would - and on that page you would see that at these very low pressures, the temperature difference between melting and boiling is very small.
  Forum: MSL · Post Preview: #192499 · Replies: 150 · Views: 169790

djellison
Posted on: Sep 30 2012, 11:25 PM


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Quite- we''re dancing around a tiny tiny wedge at the low pressure end of the liquid part of the H2O phase diagram. Even with dramatic salt content, that end of the diagram doesn't change much.

  Forum: MSL · Post Preview: #192479 · Replies: 150 · Views: 169790

djellison
Posted on: Sep 30 2012, 09:47 PM


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It would boil, would it not?
  Forum: MSL · Post Preview: #192475 · Replies: 150 · Views: 169790

djellison
Posted on: Sep 30 2012, 04:39 PM


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QUOTE (atomoid @ Sep 28 2012, 05:37 PM) *
Seems fun to compile a compendium of sparkly bits and map them for future causes, so here's a start on a hit list, i hope it continues:
SOL 38: LEFT - RIGHT
SOL 50: LEFT - RIGHT


The Sol 50 one should be caught in that Sol 50 aft M100 panorama.
  Forum: MSL · Post Preview: #192445 · Replies: 587 · Views: 801618

djellison
Posted on: Sep 30 2012, 04:31 PM


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QUOTE (Eyesonmars @ Sep 30 2012, 09:03 AM) *
the boiling point on mars even at the bottom of Hellas will never be more than about 5c above freezing


This is the kicker. Are there conditions where liquid water could exist on the surface of Mars today. Yes. Two problems, where does it come from, and it would so very quickly evaporate away that its existence could only ever be transient.
  Forum: MSL · Post Preview: #192442 · Replies: 150 · Views: 169790

djellison
Posted on: Sep 30 2012, 03:23 PM


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So we are extending the GRAIL/MoonKAM Eyes on the Solar System interface this coming week to include the extension, but even we don't have details in the final decommissioning. There's a big +/- in there, and no detail on the finality of it all yet.
  Forum: Lunar Exploration · Post Preview: #192434 · Replies: 102 · Views: 167416

djellison
Posted on: Sep 27 2012, 09:16 PM


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Seems like a lot of mass/complexity to do something that the winds are going to do to you anyway, right? I wish we had the budget to do TiME, CHopper and InSight.
  Forum: Saturn · Post Preview: #192266 · Replies: 21 · Views: 34511

djellison
Posted on: Sep 27 2012, 08:30 PM


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QUOTE (Chmee @ Sep 27 2012, 01:25 PM) *
Since there is no obvious outlet along the rim wall for water / glaciers etc to have eroded the crater bed to,


Why must it have been water? The theories I have seen suggest wind.
  Forum: MSL · Post Preview: #192259 · Replies: 294 · Views: 379886

djellison
Posted on: Sep 27 2012, 07:48 PM


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Everything I've read suggests the lakes are ethane/menthane - not longer more tar like hydrocarbons.

Some of the SAR Topo passes have shown the surfaces to be mill-pond smooth.
  Forum: Saturn · Post Preview: #192253 · Replies: 21 · Views: 34511

djellison
Posted on: Sep 27 2012, 07:14 PM


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QUOTE (fthurber @ Sep 27 2012, 07:00 AM) *
It has been put off for a few weeks so I have to believe that something important has happened


Your options basically are 'SAM may or may not have detected methane'. Isn't that fairly obvious?

If some startling revelation were found, they would have a press conference about it when they were confident in the results. If there were something up with SAM they would ( as with REMS ) let us know.

No news isn't bad news or good news.
  Forum: MSL · Post Preview: #192244 · Replies: 587 · Views: 801618

djellison
Posted on: Sep 26 2012, 03:39 AM


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QUOTE (atomoid @ Sep 25 2012, 07:04 PM) *
But jamming a major upgrade into MSL's package in just 9-12 months does seem ambitious.


On what basis are you saying it's 'jamming'. You don't know how long AEGIS has been worked on at JPL for MSL deployment. You don't know when it started, what the schedule is like, what the testing plan is etc etc. You're talking as if the flight software engineers are morons.

They are not.
  Forum: MSL · Post Preview: #192135 · Replies: 587 · Views: 801618

djellison
Posted on: Sep 25 2012, 01:14 AM


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What latitude would suit observers? McNaught was very much for our Southern Hemisphere friends.
  Forum: Chit Chat · Post Preview: #192052 · Replies: 282 · Views: 169123

djellison
Posted on: Sep 24 2012, 06:11 PM


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Note that the thesis concludes that " in less than a month a large part of the blue, green, yellow and red areas just above the embedded magnets on the MSL calibration targets will be almost completely obscured by dust" - 48 sols in and I don't think we could say that they're 'almost completely obscured' so we already have reason to question its conclusions.

  Forum: MSL · Post Preview: #192017 · Replies: 529 · Views: 461044

djellison
Posted on: Sep 24 2012, 04:52 PM


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Note - you're not using calibrated data - you're using JPG's on a rapid release raw website. You're not comparing apples to apples at this point.

Calibration targets get dirty. It happened on Viking, MPF, MER, PHX...and it's happening on MSL.
  Forum: MSL · Post Preview: #192012 · Replies: 529 · Views: 461044

djellison
Posted on: Sep 23 2012, 10:44 PM


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Let's see if Mars behaves the same as that wind tunnel test.I'd be surprised if it does- Mars rarely plays by the rules.
  Forum: MSL · Post Preview: #191990 · Replies: 529 · Views: 461044

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