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djellison
Posted on: Oct 26 2009, 08:11 AM


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The most likely failure as the investigation concluded, would be an early shut down of thrusters. This means, on the surface, there should be a heatshield, like Phoenix, a Backshell and Parachute, like Phoenix, and a crashed lander.

I'm still looking at the PHX landing sites HiRISE images of the new season, trying to find the landing site - and can't.
  Forum: Past and Future · Post Preview: #148695 · Replies: 132 · Views: 437972

djellison
Posted on: Oct 24 2009, 08:20 PM


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Others I follow:

ulalaunch
NGLLC09
chrislintott
ProfBrianCox
DrLucyRogers
AlanStern
astro0_umsf
lorddrayson
therealBuzz
HiCommander
marssciencegrad
SPOTScott
dr_david_w
Nancy_A
martiansoil
jetlab
aggieastronaut
marschronicler
Astro_Mike
EuroSpaceAgency
BLOODHOUND_SSC (ok - not space - but it's rocket powered biggrin.gif )
Gyeehill
nivnac
mars_stu
HiRISE
milesobrien
MarsScienceLab
MarsRovers
marsroverdriver






  Forum: Chit Chat · Post Preview: #148642 · Replies: 4 · Views: 4290

djellison
Posted on: Oct 23 2009, 06:23 PM


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As a guidance - if you have to prefix your post with "I hope this isn't sailing too close to the wind..." or " I hope this isn't over stepping the mark..."

Save us all the trouble, and just assume it IS.

AND AGAIN - more posts discussing the legal issues of the Titanium issue. Anyone who posts on the subject again will be suspended.
  Forum: MSL · Post Preview: #148596 · Replies: 70 · Views: 79898

djellison
Posted on: Oct 23 2009, 06:10 PM


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McCool Hill was found to be SLIGHTLY higher smile.gif
  Forum: Spirit · Post Preview: #148592 · Replies: 1068 · Views: 609987

djellison
Posted on: Oct 22 2009, 07:15 AM


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Given the litigious nature of US law and pending court cases of those involved, several posts that someone could consider potentially libellous have been culled.
  Forum: MSL · Post Preview: #148506 · Replies: 70 · Views: 79898

djellison
Posted on: Oct 22 2009, 07:06 AM


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ExoMars is accelerating into the future, remember. THe 2004 plan was for a 2009 launch. Since then it has slid 9 years, in 5 years.
  Forum: ExoMars Program · Post Preview: #148504 · Replies: 589 · Views: 581352

djellison
Posted on: Oct 21 2009, 11:56 AM


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http://www.marspages.eu/media/archive4/exo...ichtSep2009.pdf

Two rovers delivered to the same place?

I'm at the shaking-head-in-disbelief stage now.
  Forum: ExoMars Program · Post Preview: #148448 · Replies: 589 · Views: 581352

djellison
Posted on: Oct 20 2009, 12:28 PM


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QUOTE (MarsIsImportant @ Oct 20 2009, 12:55 PM) *
Physics tells us that it is impossible to move them given the wind forces on Mars Today.


Really?

Where?

We've seen rover tracks nearly vanish overnight.

We've seen blueberries re-excavated after being burried by rover wheels within a year.

You underestimate what the wind, and time, can do.
  Forum: Opportunity · Post Preview: #148398 · Replies: 916 · Views: 424873

djellison
Posted on: Oct 20 2009, 10:24 AM


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QUOTE (MarsIsImportant @ Oct 20 2009, 09:13 AM) *
Certainly the wind did not blow them there.


On what basis do you make this claim.

Almost everything we see at Meridiani is the result of what the wind has been doing, given several billion years to do it.

Wind combined with the tiny tap of dust bouncing along the ground in high wind speeds would, over time, move small metal pieces like that. Why wouldn't it.
  Forum: Opportunity · Post Preview: #148393 · Replies: 916 · Views: 424873

djellison
Posted on: Oct 20 2009, 10:22 AM


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There have been two since spring - but I've not had enough chance to really hunt for Phoenix in them.
  Forum: Phoenix · Post Preview: #148392 · Replies: 159 · Views: 305216

djellison
Posted on: Oct 20 2009, 07:45 AM


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That story says

ESA EDL test 600kg battery only short life lander in 2016 launched on Atlas V.
THEN
ExoMars landed with Skycrane Atlas V launch in 2018

This makes no sense whatsoever to me. None. Exomars will have to be scrapped and started from scratch to justify a skycrane landing (ExoMars was about 200kg. MSL is more than trebble that)

And you could make this 600kg lander LIGHTER by giving it solar arrays and have a longer life. What thought process justified an Atlas V's launch, for a week of 600kg lander?

Furthermore - a 600kg lander is neither a test for a networked lander system (to heavy) nor appropriate for landing the orig Exo Mars.

At this point - I actually want the entire plan scrapped. It's utterly nonsensical. For the mass budget of the 2016 launch - you could do Netlander (which is what ESA should have been building since 2004)

Were 5 years into this plan - and they've just thrown away the two elements that appeared to make a tiny bit of sense and started again.

A complete and utter mess. An embarrassment. I'm clinging on to the hope that there's just a lot of lost-in-translation and bad reporting going on here.
  Forum: ExoMars Program · Post Preview: #148383 · Replies: 589 · Views: 581352

djellison
Posted on: Oct 20 2009, 07:05 AM


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I just can't help thinking of the old chestnut "Let's work the problem people, let's not make it any worse by guessing". I don't need to tell you where that comes from. I could site other references - but they would be in breach of the forum rules.

This is - without a shadow of doubt - the right way to be doing this. Impatience is not an option.
  Forum: Spirit · Post Preview: #148380 · Replies: 1068 · Views: 609987

djellison
Posted on: Oct 19 2009, 10:06 PM


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I've got another potential nominee as well (call it a surprise guest appearance) - as long as all the nominees are happy, I'm happy to share the finished application with everyone here once it's submitted.
  Forum: Conferences and Broadcasts · Post Preview: #148356 · Replies: 34 · Views: 23848

djellison
Posted on: Oct 19 2009, 08:11 PM


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So a battery powered EDL tech demo in 2016, followed by an entirely unrelated landing in 2018.

What's the demo for, exactly. What future payloads are planned within the performance envelope of the tech test.

The entire ExoMars project is a mess. It needs properly ripping up and starting from the beginning again.

Since it's conception - it's not just stayed a static distance in the future like most doomed projects - it has accelerated further into the future and now, after 5 years, lies further away than it ever has before. http://twitpic.com/lacef



  Forum: ExoMars Program · Post Preview: #148349 · Replies: 589 · Views: 581352

djellison
Posted on: Oct 19 2009, 04:34 PM


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But riding to the ground with 600kg of rover using Skycrane isn't an EDL demo opportunity.
  Forum: ExoMars Program · Post Preview: #148334 · Replies: 589 · Views: 581352

djellison
Posted on: Oct 19 2009, 03:25 PM


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http://209.85.229.132/search?q=cache:qtGkY...=clnk&gl=uk

We're looking at 140 Watts at 1AU. That's 65-ish-watts at Mars distance - so 1 kg of Solar Array would give you perhaps 360 Whrs PER SOL. (assuming 1 W turns into approx 6 Whrs over a 12 hr day)

I can't imagine any scenario other than a DS2 type mission where you would just take batteries and die when they run flat.

  Forum: ExoMars Program · Post Preview: #148330 · Replies: 589 · Views: 581352

djellison
Posted on: Oct 19 2009, 08:07 AM


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I assume battery powered is just an inappropriate phrase to mean not RTG powered.
  Forum: ExoMars Program · Post Preview: #148319 · Replies: 589 · Views: 581352

djellison
Posted on: Oct 18 2009, 05:51 PM


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QUOTE (stevesliva @ Oct 17 2009, 02:12 PM) *
I'm not sure how old it is!


It's two years old - and for some reason Spaceref decided to feature it a few days ago without explaining why. Quite odd.
  Forum: MRO 2005 · Post Preview: #148288 · Replies: 211 · Views: 593883

djellison
Posted on: Oct 18 2009, 01:48 PM


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Helen thinks it looks a bit like the deathstar smile.gif
  Forum: Cassini's ongoing mission and raw images · Post Preview: #148278 · Replies: 308 · Views: 299431

djellison
Posted on: Oct 17 2009, 12:42 PM


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Right - Nigel, Stu, James, Joe - send me an email ( djellison@mac.com ) and I'll send you the draft application and what I need from you.

Doug

  Forum: Conferences and Broadcasts · Post Preview: #148238 · Replies: 34 · Views: 23848

djellison
Posted on: Oct 17 2009, 08:41 AM


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It would also be a lot lighter. Beagle 2 used a wide angle mirror that would pop up infront of its camera to get a complete 360 very quickly and dirtily.
  Forum: Mars · Post Preview: #148235 · Replies: 90 · Views: 255133

djellison
Posted on: Oct 16 2009, 12:57 PM


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QUOTE (Phil Stooke @ Oct 16 2009, 01:45 PM) *
d the only way I can reconcile them is to say that the tonne of regolith is not dug up in one place but scraped in a layer 1 mm thick over a large area. In other words the bulk regolith is 'bone dry' and a very thin surface layer has all the water.


That's the idea I got as well - and is the figures I used when estimating just how useful it might be.
  Forum: LRO & LCROSS · Post Preview: #148154 · Replies: 245 · Views: 219200

djellison
Posted on: Oct 16 2009, 11:01 AM


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We actually had, at the 1:10,000,000,000 scale - on the info sheets, the Earth and Moon, Saturn + Titan, and Jup + Galileans at the scale sizes and distances.

I was going to take my 40cm earth and 10cm moon that I can place 12m apart for scale - but I was worried that the scales would be confusing for the general public, and my experience on the day actual confirmed those worries and I'm glad I didn't take them. People were looking at the images on the info sheets (which were, 50x, 100x, 10x scale size) and thinking THAT was the scale, several times I had to correct people and show them the actual scale on top of the black cane.

A scale Saturnian system would be brilliant - but having two different scales at the same venue would, for the general public, be confusing.
  Forum: Chit Chat · Post Preview: #148145 · Replies: 22 · Views: 17668

djellison
Posted on: Oct 16 2009, 05:59 AM


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Check the bottom of http://pancam.astro.cornell.edu/pancam_instrument/team.html

The Sky Hemisphere is the unlikely-to-ever-happen idea of doing a full pan of the sky, with Pancam.
  Forum: Mars · Post Preview: #148126 · Replies: 90 · Views: 255133

djellison
Posted on: Oct 15 2009, 10:12 PM


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All those words and 'sky hemisphere' didn't get mentioned once. Good work Mike.

smile.gif
  Forum: Mars · Post Preview: #148099 · Replies: 90 · Views: 255133

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