Stu,

I agree, the images are truly awesome. But I don't see any modifications between the images, only parallax effects. Any places where material slid into the crater look much the same in both images, but only displaced and stretched by the different perspective.

Steve,

Really? I think I can see several places where wasting has occurred - the actual shapes of some of the outcrops has changed. Can't point you to them right now; Dr Who's about to start here in the UK...!

MOLA meets Victoria

I think it's worth to mention it. Note Pertinax' Victoria profiles:

- http://www.unmannedspaceflight.com/index.p...indpost&p=48507

- http://www.unmannedspaceflight.com/index.p...indpost&p=48607

- http://www.unmannedspaceflight.com/index.p...indpost&p=48635

Agree with Steve. There're no evidences for recent edge slumping.
These two images show a very small period of Mars time. There it have to be few debris visible at least.

Apropos debris, Victoria seems to be a relatively young crater in comparison to Erebus, but all-around debris of the impact ablated and disappeared because the impact took place millions years ago maybe.

Didn't the MGS imaging team announce they'd actually imaged gully formation and dust slides - on images taken several months (or was it years?) apart - last year? I seem to remember that being a big deal at the time...

Maybe just seeing what we - I - want to see, but it doesn't seem impossible to me, if only because of the obvious fragility of the structures we can see extending into the crater from its edge. Undercut them with wind - something's making those dunes on the crater floor - long enough and they'd get a bit doddery, surely?

Only one thing for it - redirect MRO to fly-over Victoria immediately, we demand it!

Seriously tho, even if there's no modification going on here, Victoria is going to be absolutely fascinating close-up.

Yeah there are some images of recent chances from the MOC.

These structures that extending into the Victoria crater could maybe a bit undercut - but my guess is they don't. But either way - your image of hanging edges is a great vision!

Not willing to tread on your toes, prometheus - I was doing this while you sent your definitive version of Victoria in 3-d, thanks for it!

This is showing a bit larger area. Only a crude x-eyed handiwork, using the new MGS image and one of those older ones in B. H.'s composite above. What amazes me is the absolutely flat surroundings of VC, and all of a sudden this tremendous abyss. VC must be some kind of a collapsed crater.

edit: See post #25 below for more usable version, friendly converted by Bob Shaw.

This post has been edited by marswiggle: Apr 16 2006, 11:55 PM

Wow, I know that vertical scale must be exaggerated, but that seems to be one heck of an overhang between 10 and 11 o-clock (and generally in that quadrant). Then there's the crater on the rim at the bottom - surely that happened after Victoria formed, so why isn't the rim more distorted in its vicinity? Gotta see that up close. I don't see any safe means of entering Vicky. Hopefully it will look more accessible once Oppy gets there.

I checked the data on images R1400021 and R2200640 at the USGS catalog of MOC images and found there isn't data on image orientation, and hence on the convergence of the images.

There is, however, the altitude of the spacecraft and the slant range to the image center. A little trigonometry and we find R1400021 deviates from the vertical by 24.0° and R22000640 by 15.8°. Depending on the geometry, the images converge by anywhere from 39.8° to 8.2°. Although a larger convergence would be great, either should give enough elevation information to fill in some of the gaps in the MOLA data.

Does anyone of the experts here know a source for image orientation parameters to get a better convergence figure?

Here's a shrunken version of the image above.

If there's a way in, I'd say the on-ramp is at 9:10 (on a clock face). I see zero in the way of impact features - this is all about mass wasting.

Bob Shaw

Wow!

Here's an animated stereo image I made from Viccy's MOC images, kind of like a smooth flicker-GIF:

Wow! That's awesome!

Getting dizzy almost

Impressive picture. It would be very alike since the depth of Victoria crater is around 35 meters from the surface, its depth is like a building of 13 floors.

Other thing, I have realized that the rim of Victoria is not circular but zigzag. It might be due to the landslide of land (gullies) caused by the water or aeolian erosion.

Besides, the south of rim has more extension of ligther color than the north ones. The north is coverd by the dark color. I suppose that the prominent wind comes from the South east (watch the formation of ripples at the bottom) and it caused the dark tail on the northern Victoria rim.

Since the Victoria's rim has zigzag shape, I am afraid to approach to the rim since some of them might be so fragil that with the Oppy's extra weight might cause a new gully.

Rodolfo

For those who like anaglyphs