The Stain - Page 34

Previous 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 Next
Author Message

Posts: 303

Reply: 661

PostPosted: January 13, 2013 6:07 PM 

I myself think that this is precisely the reason why a Mars sample return mission is a bad idea, as it looks like this particular *thing* (like John Carpenter's "The Thing") may be moving on its own accord. IMO, it would be much safer to do any life detection experiments with robotic probes (as we are doing now) and with androids as the technology for that advances in the 21st century as well.




Posts: xxx

Reply: 662

PostPosted: January 16, 2013 5:44 AM 

Martian dust is magnetic Curiosity uses magnets to herd it away from the REMS sensors:



Posts: 1661

Reply: 663

PostPosted: January 16, 2013 12:02 PM 

kevin et al>>>

See post 304 and 307 this thread.



Posts: xxx

Reply: 664

PostPosted: January 17, 2013 7:07 AM 

Hi dx, yep you were vindicated on that one NASA/JPL were well aware the dust is magnetic and thus installed the magnets knowing they would keep it away from the sensors.

Glenn Fishbine

Posts: xxx

Reply: 665

PostPosted: January 17, 2013 7:54 AM 

This is going on too long and too weird. Horton, Do you have a single good shot of the stain on one day taken through each of the 15 filters?

If so, I'll try to characterize the spectrum. Maybe that will give some indication of what it isn't.


Posts: xxx

Reply: 666

PostPosted: January 17, 2013 9:29 AM 

To the best of my knowledge there has never been a full filter view of the entire stain. The full filter pancam calibration images routinely contain bits of the stain -but not enough to construct a good reflectance spectra.


Posts: 344

Reply: 667

PostPosted: January 17, 2013 11:26 AM 

See Horton's post 608 in this thread. The Sol 2795 pancams are probably the best view of the entire stain stain area, for the left-eye filters at least.

There are also good views in post 534 (Sol 2855) and post 555 (Sol 2876), but again I don't know about the filter set. I guess the right-eye filters are the ones you really want? (To look for potential hydration signatures.)

Glenn Fishbine

Posts: xxx

Reply: 668

PostPosted: January 19, 2013 8:16 AM 

Barsoomer, actually the filters between left & right are designed to give narrow band coverage over a rather wide range. It's not like a spectrometer, but it's good broad coverage. I'll check out your suggested posts.

Maybe we can send a tax-payer request to the MER team for a full filter shot of the stain. I'm sure they troll here.

Horton can you point me to a full raw calibration set that includes a portion of the stain? In principle a single common calibrated pixel will provide the spectrum. All I was going to do was grab a single region and average the value and then scale according the the CCD calibration references.

It would turn into 15 data points.

If the calibration target is in the field of view, even better because that gives an ambient lighting control data set. Smile


Posts: 3465

Reply: 669

PostPosted: January 30, 2013 11:49 AM 

Sol 3203 ( Jan 27, 2013 ) enhanced difference false color view of sundial and nearby bedrock:

Looks like the stain is gone. Long live the stain! The deck area behind and to the left of the sundial is now "cleaned" deck.

As an aside, I wonder if the "burple" berries behind the rover are "new berries?"

Glenn, I think that the enhanced difference false color 3D images ( full filter left and right ) are the best we are going to be able to do to demonstrate that the stain is ( was ) "different" than anything else seen.

Be sure to use the original data from the Analyst Notebook.


Posts: 3465

Reply: 670

PostPosted: February 12, 2013 1:14 PM 

sol 3216 ( Feb 9, 2013 ) animation of sundial stain changes:

Well. I didn't expect to see the stain again - but there it is.

Note that the reappearance was very quick ( <26 minutes ) after a short ( about 15 meters ) drive.


Posts: 692

Reply: 671

PostPosted: February 12, 2013 2:49 PM 

Great observation Horton.

I still wondering about:
What is under this stain area, - the other side of the rover deck.

I was thinking about devices which could develop intermittent strong electro magnetic influence of magnetic Martian dust. Hmm -but this only in less than 26 minutes...

If there isn't such devices, this theory can for sure be ruled out.

Other theories?


Posts: 344

Reply: 672

PostPosted: February 13, 2013 11:54 AM 

That's a real puzzler. The new stain looks a bit patchy---not what I would expect. There are no signs of dust being blown away to uncover an old stain. Maybe dust fell away from the vibration of movement but it doesn't seem like the deck would have been angled the right way for the direction of motion.

Great work, Horton, to "catch it in the act" of forming within a 26 minute window. I wonder if a 3-D version might show whether the patchy areas have some height and how flat the new stain is.


Posts: 3465

Reply: 673

PostPosted: February 25, 2013 8:22 AM 

sol 3230 ( Feb 23, 2013 ) short term changes after move:

Here is the animation of changes from sol 3216 to 3230. The changes occurred each time after a move.


Posts: 3465

Reply: 674

PostPosted: September 1, 2013 1:36 PM 

Sol 3393 3407 ( Aug 10-24, 2013 ) animation of changes to the sundial stain:

something NEW happening on the rear deck. See Flickr comments.

WHERE did the material in the new double line stain come from??? Why NOW - 9+ years into the mission?

Was there a cleaning event? Maybe a passing dust devil deposited material on the deck rather than remove it?

The last few reported values for sol / power / tau / dust are:

3410 373, 0.646, 0.525
3404 367, 0,550, 0.522
3397 376, 0.695, 0.532
3390 385, 0.770, 0.543
3384 395, 0.800, 0.574

So in general the sky has been getting clearer, and the dust factor is dropping - but nothing dramatic.

The last RAT brush was sol 3403 so it is possible that the unusual red "dust" from the brushing blew from the front of the rover to the back. A full navcam view of the deck would be instructive.

Any other ideas?


Posts: xxx

Reply: 675

PostPosted: February 23, 2014 11:45 PM 

Sol 3585 ( Feb 23, 2014 ):

Well. It's baack!


Posts: 344

Reply: 676

PostPosted: February 24, 2014 3:25 PM 

That was a surprise!

The boundary of the new stain seems somewhat diffuse. I think that the early appearances of the stain had a sharp boundary. That makes me wonder if the stain just got covered with dust that has now partially blown away?


Posts: xxx

Reply: 677

PostPosted: February 25, 2014 7:46 AM 

Sol 3585 ( Feb 23, 2014 ) 3D of new sundial stain:

The new stain looks similar to the new stain of sol 3407 ( reply 674 ) - which quickly disappeared.

If this new stain disappears as quickly then it is reasonable to conclude that the new stain is not the same material as the old long lasting stain.

When all the filters are down I will see if I can tease any more information out of the images and look for differences.


Posts: xxx

Reply: 678

PostPosted: February 27, 2014 8:52 AM 

Sol 3585 3588 ( Feb 23-26, 2014 ) animation of changes to the sundial stain:

That one didn't last long.

Again, the new stains do not have the staying power of the old ones. Perhaps less material is there to be moved about?


Posts: 692

Reply: 679

PostPosted: February 28, 2014 4:11 PM 

This is really an unsolved mystery this "Stain" issue. How about thinking around condensed water vapor/freezing vs thaw conditions. As a dust collector. And the tricky winds which removes dust and may always solve some problems and seems always to be present on Mars when all other theories fail ... Yep, windblown dust and ice conditions. I think it's not. JPL is silent about this issue, I'm sure they have noticed this. They really don't know.


Posts: xxx

Reply: 680

PostPosted: March 6, 2014 12:54 AM 

Sol 3591 ( Mar 1, 2014 )sundial stain:

Part of the "stain" has moved to the left.

Previous 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 Next

Join the conversation:

Very Happy Smile Sad Surprised
Shocked Confused Cool Laughing
Mad Razz Embarassed Crying or Very Sad
Evil or Very Mad Twisted Evil Rolling Eyes Wink
Powered by MTSmileys