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djellison
Posted on: Jun 12 2014, 05:55 PM


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QUOTE (elakdawalla @ Jun 12 2014, 10:01 AM) *
It's been pointed out to me that Curiosity is getting very close to the edge of the landing ellipse.


It's a point worth making - there have been many many ellipses. The early one pre-launch. The one that got shrunk mid-cruise. The one that shrunk futher and moved a little south before landing etc etc.


  Forum: MSL · Post Preview: #210272 · Replies: 2243 · Views: 2182913

djellison
Posted on: Jun 10 2014, 09:45 PM


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Didn't see that one coming at all - it was a Mercury transit..

http://www.jpl.nasa.gov/news/news.php?release=2014-183
  Forum: MSL · Post Preview: #210218 · Replies: 415 · Views: 387792

djellison
Posted on: Jun 9 2014, 10:09 PM


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When it's firing the laser, the spectrometer of ChemCam is collecting data for the spectra - not sure if it could image at the same time. I would expect it's a few seconds between frames in any case.

D
  Forum: MSL · Post Preview: #210195 · Replies: 493 · Views: 331869

djellison
Posted on: Jun 6 2014, 09:34 PM


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Sol 657 MastCam L mosaic ( with a tiny image from a few dozens sols earlier to patch a tiny gap on the Mt Sharp skyline )

http://www.gigapan.com/gigapans/156227

  Forum: MSL · Post Preview: #210162 · Replies: 493 · Views: 331869

djellison
Posted on: Jun 6 2014, 02:20 PM


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Take a couple of screenshots a few seconds apart and try it.

I had a go a few weeks ago basically without success.
  Forum: Earth Observations · Post Preview: #210147 · Replies: 19 · Views: 56610

djellison
Posted on: Jun 4 2014, 09:57 PM


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For those who anaglyph....
  Forum: MSL · Post Preview: #210113 · Replies: 493 · Views: 331869

djellison
Posted on: Jun 3 2014, 12:53 PM


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QUOTE (dvandorn @ Jun 3 2014, 12:11 AM) *
What scientific value can you get from MSL in terms of imaging faint stars that you can't get one huge heck of a lot easier (and far more cheaply) with other resources? You know, like going in the back yard with a pair of binoculars?


Apart from the observations others have already mentioned, there's good words by Jim Bell on what they were looking at when doing similar observations with Spirit a long time ago.
http://marswatch.astro.cornell.edu/pancam_...projects_2.html
  Forum: MSL · Post Preview: #210080 · Replies: 415 · Views: 387792

djellison
Posted on: Jun 2 2014, 02:11 AM


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At last a nice blog post full of details about exactly what they've managed to do so far!

http://spacecollege.org/isee3/isee-3-reboo...e-and-more.html

Looks like they'll need only 5.8m/sec to divert onto the appropriate lunar flyby trajectory.
  Forum: Cometary and Asteroid Missions · Post Preview: #210054 · Replies: 91 · Views: 140049

djellison
Posted on: May 28 2014, 03:45 PM


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QUOTE (jmknapp @ May 28 2014, 04:41 AM) *
But all of it?


Nope. If you look closely at this one (and the many seen by Spirit and Opportunity over the years) there are little patches tucked away inside some of the regmaglypts that could be signs of chemical erosion. It would also be quite hard to tell apart surficial dust ( being as it's largely iron oxides ) and rust on a iron meteorite ( being as it is also largely iron oxides )




  Forum: MSL · Post Preview: #209943 · Replies: 493 · Views: 331869

djellison
Posted on: May 27 2014, 09:03 PM


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Previously I'd only been able to track it during '08 when there were subtle changes ( bits folding over etc ) twice in October '08 and once between then and December.
Attached Image
  Forum: Phoenix · Post Preview: #209919 · Replies: 10 · Views: 39584

djellison
Posted on: May 27 2014, 03:41 PM


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NICE FIND (especially as the HiRISE team didn't use the word Phoenix in the observation title! ) As some of you know - watching parachutes in HiRISE is something of a personal obsession. Spirit's flapped around once and hasn't moved since. Still waiting for follow up images with Opportunity. But I hadn't thought to look at the Phoenix chute. Now on my to-do list!
  Forum: Phoenix · Post Preview: #209907 · Replies: 10 · Views: 39584

djellison
Posted on: May 27 2014, 02:51 PM


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Yes - but Juno was coming to within a few hundred km of Earth - thru the shell of comm HEO, MEO, LEO spacecraft - thousands and thousands of active and tens of thousands of deceased bits of hardware. That is deserving

ISEE-3 with possible lunar flyby or lunar impact? Using words like "threaten other spacecraft in Earth orbit" - that's laughable. There's as much chance as a random asteroid taking out an earth orbiting spacecraft
  Forum: Cometary and Asteroid Missions · Post Preview: #209905 · Replies: 91 · Views: 140049

djellison
Posted on: May 27 2014, 12:25 AM


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Agreed - it's a laughable suggestion.
  Forum: Cometary and Asteroid Missions · Post Preview: #209894 · Replies: 91 · Views: 140049

djellison
Posted on: May 21 2014, 04:12 PM


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Indeed - the AmSat DL team at Bochum with their 20m dish that's just 1/15th the diameter of Arecibo received a signal almost 2 months ago

http://amsat-uk.org/tag/bochum/

  Forum: Cometary and Asteroid Missions · Post Preview: #209765 · Replies: 91 · Views: 140049

djellison
Posted on: May 19 2014, 03:03 PM


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Guys - this is a thread for actual route maps - not hypotheticals. Please take that discussion elsewhere.

  Forum: MSL · Post Preview: #209715 · Replies: 2243 · Views: 2182913

djellison
Posted on: May 15 2014, 10:05 PM


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QUOTE (walfy @ May 15 2014, 01:38 PM) *
Very nice results with that method, hope to give it a try when I have a chance. Quick Photoshop mosaics with L and R separately, then combining into 3D, are usually pretty bad!


Yeah - the trick ( with PTGui or even HUGIN ) is to have it retain the positional information based on control points on one eye....to project out the other eye.
  Forum: MSL · Post Preview: #209646 · Replies: 327 · Views: 245167

djellison
Posted on: May 15 2014, 07:49 PM


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QUOTE (charborob @ May 15 2014, 12:10 PM) *
Stitch the images first (left and right separately), and then combine them into an anaglyph.


That's one way.

The way I do it is to use PTGui with one set of images ( say left ) and generate a mosaic. Then, swap the input frames out and export a new mosaic....and then merge the pre-stitched L and R mosaics afterwards.

That's how I went from http://dougellison.smugmug.com/Landscapes/...ity/i-8MQHgg4/A to
http://dougellison.smugmug.com/Landscapes/...ity/i-mMdVrJn/A

  Forum: MSL · Post Preview: #209641 · Replies: 327 · Views: 245167

djellison
Posted on: May 13 2014, 07:55 PM


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Don1 - you're attempting to read an awful lot into...well...nothing. You're working from a sample of 1 which is not significant.




  Forum: MSL · Post Preview: #209598 · Replies: 327 · Views: 245167

djellison
Posted on: May 9 2014, 12:56 AM


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Sol 620 Pan looking toward the foothills of Mt Sharp.

Full Res here : http://dougellison.smugmug.com/Landscapes/...MR-Panorama.jpg
  Forum: MSL · Post Preview: #209545 · Replies: 327 · Views: 245167

djellison
Posted on: May 8 2014, 10:27 PM


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QUOTE (fredk @ May 8 2014, 07:20 AM) *
I don't know what the covers/windows are like - in particular, are they flat?


For ChemCam - yes - I believe the window is flat. The mirror behind it is concave obviously.

However as I've already said - the mast is typically pointed away from drill sites during drilling. We were explicitly told to show that when the rover is doing drilling - the mast looks about 120deg right of forwards - as away from drill sites as possible

https://www.youtube.com/watch?v=P4boyXQuUIw#t=541
(9 mins / 540 seconds in)


  Forum: MSL · Post Preview: #209538 · Replies: 327 · Views: 245167

djellison
Posted on: May 8 2014, 10:25 PM


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Those are going to be some beautiful images - congrats to the MSSS team on being selected!

  Forum: OSIRIS-REx · Post Preview: #209537 · Replies: 70 · Views: 177588

djellison
Posted on: May 8 2014, 01:33 PM


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QUOTE (jmknapp @ May 8 2014, 01:46 AM) *
Maybe the ChemCam lens?


The mast is typically commanded to point away from a drill site when drilling is taking place, so that seems unlikely.
  Forum: MSL · Post Preview: #209526 · Replies: 327 · Views: 245167

djellison
Posted on: May 7 2014, 02:36 PM


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QUOTE (Doug M. @ May 7 2014, 06:54 AM) *
However, looking at the list, we can see that a lot of these missions involved fairly major advances in design


I see no less or more design advances in that list than the decade after it, or before it.

You've asked the "sincere question" and you've been given the same answer many times over.
  Forum: Exploration Strategy · Post Preview: #209501 · Replies: 18 · Views: 33139

djellison
Posted on: May 6 2014, 08:24 PM


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QUOTE (Doug M. @ May 6 2014, 12:41 PM) *
I believe that OPALS is still in development.

It was launched two weeks ago. It is currently hanging off the side of the ISS waiting for final installation later this week before being powered-up on Saturday.

QUOTE
SIAD, even more so: I believe that the first high-atmosphere test of that system will come later this year.

Both heatshield and parachute's have already been thru initial testing.
https://www.youtube.com/watch?v=3YVOpdqdULU and https://www.youtube.com/watch?v=_jOzxEOlDJg

The first of three atmospheric tests comes later this year.


QUOTE
Dawn's ion propulsion is great, but ion engines have been around for a while. Dawn's thrusters, in particular, are modified versions of the thrusters from Deep Space, launched in 1998.

I know. Dawn increases upon the Delta V of DS1 by nearly an order of magnitude. 1.3km/sec -> 10km/sec. That's revolutionary.



QUOTE
IKAROS was certainly innovative, but it's not exactly an innovation that's been seized on with enthusiasm.

Wrong. The only reason Sunjammer may not fly is budgetary - not conservative engineering or 'enthusiasm'.

There is no shortage of new technology and innovation in spaceflight.

All this stuff is a simple Google away.

We are in a genuinely exciting period of technological innovation in just about every aerospace engineering discipline. The stories are out there if you care to look for them.

I would urge you to do a little research of your own - and ponder Mike's question
QUOTE (mcaplinger @ May 6 2014, 06:13 AM) *
What would you give as an example of a less conservative period?

  Forum: Exploration Strategy · Post Preview: #209485 · Replies: 18 · Views: 33139

djellison
Posted on: May 6 2014, 04:09 PM


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QUOTE (Doug M. @ May 6 2014, 06:26 AM) *
By this I mean that we haven't seen major innovations in propulsion, communications, power sources, shielding or avionics in the last decade,


Last decade alone.....

Communications:
MRO transmitting at up to 6 Mbits/sec ( 40x the rate of previous Mars orbiters ) from Mars
MSL UHF relay at up to 2 Mbits/sec - 8x the rate of MER->ODY
LASER demo from LADEE at 620 Mbits/sec
OPALS about to be tested on ISS
Continued transition towards more Ka band 32Ghz DSN comms.

Power Sources
Increasingly efficient solar arrays enabling the first dedicated Jovian mission to fly with Solar Power ( Juno )
Development of the ASRTG ( currently on hold, but near completion )

Propulsion
Dawn's Ion engine has given it more than 6km/sec of Delta V - more than any other spacecraft in history -and may reach a total of 10km/sec
First interplanetary solar sail ( IKAROS )

Shielding
Juno's vault
Orion spacecraft student lead shielding experiment

Avionics
Transition from RAD6000 to RAD750
New avionics of SpaceX Falcon 9/Dragon (triple redundant with much COTS hardware)

Plus:
LDSD program including SIAD test program for increased EDL capacity to Mars ( potentially doubling the delivery mass of an MSL EDL like architecture )
Continued revolution in miniaturization. RACE scientific cubesat (among many, many others) , the INSPIRE cubesat BEO program.
HD color video from the surface of Mars. 1600 x 1200 MARDI movie.
Proven EDL performance increased from a 400lb rover in 2004 to a 2000lb rover in 2012


Is your statement broadly true? No. Not even slightly.
  Forum: Exploration Strategy · Post Preview: #209481 · Replies: 18 · Views: 33139

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