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djellison
Posted on: Jun 4 2015, 02:40 PM


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No. HiRISE has a resolution of 25-30cm/pixel, and that's it.
  Forum: Past and Future · Post Preview: #220971 · Replies: 39 · Views: 122204

djellison
Posted on: Jun 4 2015, 05:05 AM


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QUOTE (RichforMars @ Jun 3 2015, 04:55 PM) *
there wouldn't be anything wrong with another repeat of that mission,


Yes there would. Why would you invest the money on sending the same spacecraft to the same place with the same instruments?
  Forum: Past and Future · Post Preview: #220964 · Replies: 5 · Views: 20649

djellison
Posted on: Jun 4 2015, 12:22 AM


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Mars 6 is approx 1,500km to the SSW. Same story applies - it's two orders of magnitude further than any year of driving Opportunity has ever had.

You can see the landers and measure the distance between them yourself using Google Earth and switching to the Mars map.
  Forum: Opportunity · Post Preview: #220950 · Replies: 24 · Views: 82650

djellison
Posted on: Jun 4 2015, 12:05 AM


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QUOTE (RichforMars @ Jun 3 2015, 04:46 PM) *
Does anyone here think this rover could make a long trek to Ares Vallis?


No. Even in her most rapid of years - Opportunity covers, typically, about 10-15km/year. It's 2000km from Opportunity to Pathfinder - so it would take more than a century of driving.


QUOTE
It came to mind, as last month I was reading the old Pathfinder mission press briefing which was posted days after the mission's last data transfer from the craft. Sojourner Rover's mission was not yet over if the battery failure hadn't occured when it did the extended mission was designed to send the six wheel probe to the outer vicinity of the landing site.


I think you mis-read the press briefing. The plan was to send Sojourner on a long drive of around 50 meters around the lander - but not to the edge of the MPF landing ellipse. Sojourner's maximum theoretical radio range was about 500 meters - not the 30km+ to the edge of the MPF landing ellipse.
From https://mars.jpl.nasa.gov/MPF/newspio/mpf/r...es/mpfover.html
The rover team had planned to send the rover on its longest journey yet -- a 50-meter (165-foot)clockwise stroll around the lander -- to perform a series of technology experiments and hazard avoidance exercises when the communications outage occurred. That excursion was never initiated once the rover's contingency software began operating.
  Forum: Opportunity · Post Preview: #220947 · Replies: 24 · Views: 82650

djellison
Posted on: May 28 2015, 07:27 PM


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QUOTE (Paolo @ May 28 2015, 12:13 PM) *
is a detailed timeline of the observations at closest approach available somewhere? with times of the occultations and such? I have only found this "playbook" for LORRI and MVIC


Best I can offer is our New Horizons module for Eyes on the Solar System ( http://eyes.nasa.gov/pluto ) - we have the play by play by means of a predicted simulation.
  Forum: New Horizons · Post Preview: #220747 · Replies: 519 · Views: 385522

djellison
Posted on: May 27 2015, 02:58 PM


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QUOTE (monitorlizard @ May 26 2015, 09:09 PM) *
I was under the impression that determining the exact shape of Europa was important for modeling the tidal heating from Jupiter. It's possible to get some topographic information from stereo imaging, but it's hard to imagine getting the large area coverage with high resolution I think is necessary for detailed shape modeling.


You can do a lot lot better with stereo imaging that you could ever do with 40 flybys with a laser altimeter.

  Forum: Jupiter · Post Preview: #220703 · Replies: 107 · Views: 178715

djellison
Posted on: May 15 2015, 01:23 AM


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QUOTE (Gerald @ May 14 2015, 04:33 PM) *
Of what I've seen of the preliminary 2020 rover design.....


Source for this?
  Forum: MSL · Post Preview: #220398 · Replies: 999 · Views: 868401

djellison
Posted on: Apr 30 2015, 11:05 PM


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QUOTE (fredk @ Apr 30 2015, 03:32 PM) *
More puzzling image release quirks: PIA19319 is reflected


I don't see reflection between those two images.
  Forum: Dawn · Post Preview: #219945 · Replies: 460 · Views: 1097503

djellison
Posted on: Apr 29 2015, 06:35 PM


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QUOTE (Phil Stooke @ Apr 29 2015, 09:52 AM) *
The most basic principles of good design are being thrown out of the window, mainly because designers need to keep changing sites or they are out of a job.


I can't stand this shift to 'trendy' websites either....but I have had visibility into the process behind the redesign for many of JPLs pages...and I can tell you, the demand for it isn't coming from designers, it's coming from management.

And when it's winning awards all over the place - it's not going to go away any time soon : http://www.jpl.nasa.gov/news/news.php?feature=4566
  Forum: Dawn · Post Preview: #219876 · Replies: 460 · Views: 1097503

djellison
Posted on: Apr 29 2015, 05:31 AM


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QUOTE (PDP8E @ Apr 28 2015, 10:16 PM) *
Is it the wow factor?


Spirit did similar observations... from http://marswatch.astro.cornell.edu/pancam_...projects_2.html
" These observations can be used for various scientific purposes. These include helping to validate the models and predictions for interplanetary meteor storms, providing information on the rate of impacts of small meteoroids with Mars for comparison with rates for the Earth and Moon, assessing the rate and intensity of cosmic ray impact events in the Martian environment, and looking at whether some bright stars are being dimmed occasionally by water ice or dust clouds occurring at night during different Martian seasons."
  Forum: MSL · Post Preview: #219861 · Replies: 415 · Views: 387792

djellison
Posted on: Apr 20 2015, 02:18 PM


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QUOTE (Habukaz @ Apr 20 2015, 06:59 AM) *
Is the dimmest bright spot resolved...


The accompanying press release text clearly states

"The images show the brightest spot and its companion clearly standing out against their darker surroundings......"
  Forum: Dawn · Post Preview: #219664 · Replies: 460 · Views: 1097503

djellison
Posted on: Apr 17 2015, 06:01 PM


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QUOTE (mcgyver @ Apr 17 2015, 10:26 AM) *
I can't figure out if bright spot is visible in the animation.


It isn't.
  Forum: Dawn · Post Preview: #219605 · Replies: 460 · Views: 1097503

djellison
Posted on: Apr 16 2015, 04:32 PM


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QUOTE (Landru79 @ Apr 16 2015, 08:17 AM) *
¿Maybe a phase efect?


NO!

The Sun-Pluto-NH angle is approx 0.316 degrees currently.

It's one pixel - a bit of PSF - blown up massively. That is all.
  Forum: New Horizons · Post Preview: #219573 · Replies: 519 · Views: 385522

djellison
Posted on: Apr 16 2015, 12:25 AM


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QUOTE (Arizona Dave @ Apr 15 2015, 04:54 PM) *
like when Opportunity uncovered what appeared to be ice/front under its tracks one time.


Are you referring to when Spirit uncovered amorphous silica deposits near Home Plate?
http://photojournal.jpl.nasa.gov/catalog/PIA11758
  Forum: MSL · Post Preview: #219555 · Replies: 999 · Views: 868401

djellison
Posted on: Apr 15 2015, 07:54 PM


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QUOTE (Arizona Dave @ Apr 15 2015, 11:08 AM) *
Notice the "crack" in the soil...freeze/thaw of brine possibly?


Or simply imaging the area that the APXS was pressed into just a few minutes before

http://mars.jpl.nasa.gov/msl/multimedia/ra...206M_&s=955

  Forum: MSL · Post Preview: #219549 · Replies: 999 · Views: 868401

djellison
Posted on: Apr 10 2015, 08:18 PM


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QUOTE (JohnVV @ Apr 9 2015, 04:23 PM) *
i myself use ISIS3 but it dose NOT run on Microsoft Windows
http://isis.astrogeology.usgs.gov/index.html

you NEED RHEL6.6 or one of the free versions of that Linux operating system



No you don't. ISIS3 is also available for OSX.


meryon - if you're on a PC - you need to go IMG2PNG -> Photoshop. If you're on a Mac - then an ISIS3 pipeline is probably your best bet.
  Forum: Jupiter · Post Preview: #219433 · Replies: 269 · Views: 1144848

djellison
Posted on: Apr 10 2015, 12:05 AM


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QUOTE (Arizona Dave @ Apr 9 2015, 03:34 PM) *
KM's worth of loose overburden was deposited over areas of Gale Crate, and then subsequently blown away ??

Interesting idea...


That is the prevailing hypothesis regarding the formation of Gale at this time.
  Forum: MSL · Post Preview: #219396 · Replies: 999 · Views: 868401

djellison
Posted on: Mar 25 2015, 03:32 PM


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Based on the trajectory data we've been given for Eyes on the Solar System.... single digit km's in altitude - 5km or so.

  Forum: Messenger · Post Preview: #219109 · Replies: 527 · Views: 754958

djellison
Posted on: Mar 23 2015, 01:22 AM


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They're part of the image stream posted to the free 'Mars Images' app
  Forum: Opportunity · Post Preview: #219066 · Replies: 593 · Views: 516287

djellison
Posted on: Mar 18 2015, 08:10 PM


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QUOTE (Herobrine @ Mar 18 2015, 10:50 AM) *
I'd like to verify that we are only a couple days away from the latest possible date for 6 months worth of raw post-hibernation OSIRIS data to be made publicly available in the archives


The OSIRIS team will deliver when they deliver - the efficacy of data delivery agreements within ESA seems to be very poor.

I've said elsewhere - I'd be surprised if they delivered anything to the PSA in 2015.



  Forum: Rosetta · Post Preview: #218953 · Replies: 390 · Views: 451387

djellison
Posted on: Mar 16 2015, 08:07 PM


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Extraordinary stuff!
  Forum: MSL · Post Preview: #218899 · Replies: 999 · Views: 868401

djellison
Posted on: Mar 15 2015, 08:46 PM


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Theoretically possible to image it? Yes. MGS imaged MODY and MEX. I'm sure MRO could manage a similar stunt.

But we don't know where it is - so it's out of the question.
  Forum: Past and Future · Post Preview: #218877 · Replies: 7 · Views: 21893

djellison
Posted on: Mar 14 2015, 11:34 PM


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QUOTE (PaulH51 @ Mar 14 2015, 04:29 PM) *
this could be corruption in the NAIF data, or slip.


NAIF reports raw rover motion ( thus not accounting for slip ) at first until it's bundle adjusted and then it'll be normalized back to the 6m distance as I understand it.
  Forum: MSL · Post Preview: #218864 · Replies: 999 · Views: 868401

djellison
Posted on: Mar 12 2015, 05:07 AM


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QUOTE (Explorer1 @ Mar 11 2015, 10:03 PM) *
Reaction wheels, propellant depletion, electronics, etc?


Yes - any and all of those could cause its demise. The only certainty is that it will run out of prop eventually, and if another reaction wheel goes, that time frame is accelerated rapidly.

  Forum: Mars Odyssey · Post Preview: #218783 · Replies: 62 · Views: 216122

djellison
Posted on: Mar 11 2015, 09:54 PM


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Entirely academic.... without UHF comms, the definition of 'functional' isn't really of merit.
  Forum: Mars Express & Beagle 2 · Post Preview: #218773 · Replies: 65 · Views: 164689

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