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djellison
Posted on: Jan 22 2006, 09:47 PM


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Obviously a little hard to see much in that anim gif, but I've done my best to try and replicate as close as I can what that might have looked like in real time - unlikely to be as accurate as the previous one, but I made the duration of the eclipse from 1st to last contact as about 37 seconds.

Doug
  Forum: Opportunity · Post Preview: #37700 · Replies: 33 · Views: 37656

djellison
Posted on: Jan 22 2006, 08:42 PM


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Helen and I were at a place called 'Symonds Yat' today - a high vantage point over a large bow in the river Wye on the border between South Wales and England.

There was an exquisit layer of fog across the whole of the valley below, for dozens of miles around.

At one point, I could cast my shadow onto the fog below, and around me, was a small rainbow. The pictures don't really do it justice, so I stretched one a little to show the effect but it was quite astonishing!

Doug
  Forum: Chit Chat · Post Preview: #37690 · Replies: 4 · Views: 5681

djellison
Posted on: Jan 22 2006, 07:56 PM


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But - that will put them in a good position to image their dark sides in Jupiter shine smile.gif

Doug
  Forum: New Horizons · Post Preview: #37687 · Replies: 42 · Views: 300414

djellison
Posted on: Jan 22 2006, 07:49 PM


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Heck - the images are down but they're totally wierd ohmy.gif I think I can extract what it SHOULD look like, but it'll be a bit of a challenge.

Doug

(PS - something done with what I THINK is actually an internal reflected images of the sun within the images - real-time-sim to follow)
  Forum: Opportunity · Post Preview: #37686 · Replies: 33 · Views: 37656

djellison
Posted on: Jan 22 2006, 09:43 AM


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It's not uncommon for LV's to turn, quite a lot, after SRB sep. If you look at the rocket-cam views from Spirit and Opportunity - you can see, once SRB sep has occured, the vehicle turns quite a lot. I'm not sure why, but perhaps it's because they have to be in a particular direction for SRB-jet for range reasons, and THEN can pitch to the launch heading they want?

Doug
  Forum: New Horizons · Post Preview: #37639 · Replies: 571 · Views: 386067

djellison
Posted on: Jan 21 2006, 10:04 PM


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QUOTE (ljk4-1 @ Jan 21 2006, 09:47 PM)
Viking 1 had the shadow of Phobos pass right over it:


I know - that's why I want to see them try a Navcam movie looking at the ground during one - because we know it makes a lot of difference to the terrain.

Doug
  Forum: Opportunity · Post Preview: #37580 · Replies: 33 · Views: 37656

djellison
Posted on: Jan 21 2006, 06:33 PM


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Obviously retro reflectors work out to 400k km, but how far out would they work beyond that? Perhaps one could do radar reflection using Arecbo / DSN instead?

Also - there's no real way of knowing, (perhaps less so with the solid 48b than a liquid upper stage) what potential small forces are being generated by outgassing of remaining fuel, its exact mass etc.

Doug
  Forum: New Horizons · Post Preview: #37546 · Replies: 42 · Views: 300414

djellison
Posted on: Jan 21 2006, 11:09 AM


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Off you go and read the Steve Q'n'A smile.gif We talk about DD's and Cleaning, or infact, DD's and NOT cleaning.

Doug
  Forum: Spirit · Post Preview: #37500 · Replies: 44 · Views: 53874

djellison
Posted on: Jan 21 2006, 11:07 AM


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Perhaps it is just part of the structure required to hang the thing from Skycrane?

Doug
  Forum: MSL · Post Preview: #37499 · Replies: 61 · Views: 77658

djellison
Posted on: Jan 21 2006, 11:02 AM


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A phobos one was scheduled for a sol or two ago, but I've not seen the images come down. I intend to pull the same trick with that however.

Doug
  Forum: Opportunity · Post Preview: #37498 · Replies: 33 · Views: 37656

djellison
Posted on: Jan 21 2006, 11:02 AM


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QUOTE (Nirgal @ Jan 21 2006, 12:26 AM)
So it's really the question if it would not be more advantageous to
try to reach Victoria as a high prio goal first and then use the precious remaining rover life time *there* in order to study what could be entirely new scientific discoveries.


So the rover dies in 200 sols, 500m short of Victoria, having done no science for 200 sols smile.gif

There has to be a compromise, there are unique, new discoveries to be made right here - and to abandom the science we can see, for the science that we may not see, is a nearly wreckless strategy.

Yes - we all want to get to Victoria and see across that new crater and the amazing vista it will offer - but let's remember we may never make it anyway, and to make the assumption that abandoning science where we are will guarentee an arrival at Victoria is wrong.

I'm sure once the work at Erebus is done, we'll see good driving. The arm-issue hasnt helped, but that was a 56 sol period where the decision wasnt down to any choice - it was simply going to take that long to make sure the rover was fit to drive. A few days of festoon observations, perhaps a couple more sites of IDD work around erebus and up to Mongollon rim, then navigating a route thru the remaining etched terrain.

It's the same argument that's been had a thousand times - and I still honestly believe that the only people who can make the right call on the balance between motion and science are those who built the rovers and designed the instruments - only they can judge if the potential for a new target is worth forgoing a local one.

Doug
  Forum: Tech, General and Imagery · Post Preview: #37497 · Replies: 23 · Views: 27227

djellison
Posted on: Jan 21 2006, 10:55 AM


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I was a wreck - I don't think I've ever been as nervous about a launch as NH - I was hands-over-face-saying 'go go go go' in that quiet way you see people doing at the launch site - not even the MER launch had me so nervous. It's astonishing what effect these missions can have

Doug
  Forum: New Horizons · Post Preview: #37496 · Replies: 39 · Views: 51886

djellison
Posted on: Jan 20 2006, 11:57 PM


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Remember - the further out you push the Pluto encounter, the thinner the atmosphere is likely to be.....and the less power you'd have...and the less fuel...thus less opportunity to visit KBO's etc etc

Getting there sooner rather than later makes sense in its own right, before you add the bonus of Jupiter science.

Doug
  Forum: New Horizons · Post Preview: #37431 · Replies: 23 · Views: 37644

djellison
Posted on: Jan 20 2006, 05:59 PM


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QUOTE (Toma B @ Jan 20 2006, 03:43 PM)
.answers are only "yes" or "no".
*


The only valid answer would actually be 'don't know'

Because that's the truth. Oppy might die tomorrow, Oppy might last another 1500 sols. Who knows.

Doug
  Forum: Tech, General and Imagery · Post Preview: #37368 · Replies: 23 · Views: 27227

djellison
Posted on: Jan 20 2006, 03:44 PM


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I'll try and give it a wave when I can smile.gif
http://www.heavens-above.com/orbitdisplay....PST&satid=22076

Doug
  Forum: Earth Observations · Post Preview: #37345 · Replies: 2 · Views: 6670

djellison
Posted on: Jan 20 2006, 03:30 PM


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Pioneer 10 or 11 basically tongue.gif

Doug
  Forum: Private Missions · Post Preview: #37339 · Replies: 237 · Views: 350990

djellison
Posted on: Jan 20 2006, 03:26 PM


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http://marswatch.astro.cornell.edu/merweb/..._transit_R8.rml
CODE
Summary for: bp2666.06a.pancam_phobos_transit_R8.rml:

ETH  ESF  EDN  EFF  EHG  ERS  ECS  ERP  Total
---- ---- ---- ---- ---- ---- ---- ---- -----
25   25   0    0    0    0    0    0    50  

Duration (hhmmss)   =  00:13:45
Data Vol (Mbits)    =     24.58


That's the sequence the image is from - but it's not presenting itself as a sub-frame, it's a partial downlink of a full frame. Not sure what's going on really.

Doug
  Forum: Opportunity · Post Preview: #37338 · Replies: 88 · Views: 91917

djellison
Posted on: Jan 20 2006, 10:36 AM


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OK - who put a piece of hedge out there?
http://qt.exploratorium.edu/mars/spirit/pa...OAP2443L7M1.JPG

That's a wierd chunk-o-rock - the complex outline would suggest something volcanic to me - but I'm not a geologist smile.gif

Doug
  Forum: Spirit · Post Preview: #37298 · Replies: 783 · Views: 434417

djellison
Posted on: Jan 20 2006, 08:45 AM


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No - he said that they're meeting in 2 weeks to start planning the Jupiter campaign.

Doug
  Forum: New Horizons · Post Preview: #37286 · Replies: 8 · Views: 16834

djellison
Posted on: Jan 20 2006, 08:41 AM


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QUOTE (paulanderson @ Jan 20 2006, 02:51 AM)
I'm just curious how many UMSF people here are also members of The Planetary Society, besides myself and, obviously, Emily?


Me - and I think Nix is as well smile.gif

Doug
  Forum: New Horizons · Post Preview: #37285 · Replies: 571 · Views: 386067

djellison
Posted on: Jan 19 2006, 11:28 PM


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Before lambasting the Discovery Program and JAXA tongue.gif

Doug
  Forum: New Horizons · Post Preview: #37246 · Replies: 8 · Views: 16834

djellison
Posted on: Jan 19 2006, 10:20 PM


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QUOTE (ljk4-1 @ Jan 19 2006, 10:12 PM)
Does anyone have or know where images of the capsule holding his ashes can be found?  Where were they placed on the probe?  Did a commemorative plaque or other message accompany them?


I'd have thought that would be something of a private matter between Clyde's family and Alan.

Doug
  Forum: New Horizons · Post Preview: #37238 · Replies: 39 · Views: 51886

djellison
Posted on: Jan 19 2006, 08:51 PM


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Just a quite post-sep thread to say congratulations to Alan and the team, here's to a clean checkout and small TCM's smile.gif Many thanks for taking the time to share the experience to date with us here, your efforts are very much appreciated.

Doug
  Forum: New Horizons · Post Preview: #37208 · Replies: 39 · Views: 51886

djellison
Posted on: Jan 19 2006, 07:06 PM


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Godspeed little one. We're thinking of you.

(told you it'd jump off the pad tongue.gif )

Doug
  Forum: New Horizons · Post Preview: #37117 · Replies: 571 · Views: 386067

djellison
Posted on: Jan 19 2006, 06:19 PM


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singing - We're on the road again.... smile.gif

Navcam show tiny tiny movement of the IDD in its park position, but not too bad at all. I assume we're in situ for the festoon imaging MI work.

Doug
  Forum: Opportunity · Post Preview: #37052 · Replies: 3597 · Views: 3531676

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