[X] My Assistant

[OWW]

New raw images of Titan.

http://saturn.jpl.nasa.gov/multimedia/imag...5/N00023141.jpg

And this was taken from 1.5 million km. Now imagine images from 1500 km...

[Guest_Sunspot_*]

WOW.....I don't remember surface features appearing as clear as that before.

There doesn't appear to be any sign of large impact craters - at least not at this resolution.

[OWW]

Well, that's not exactly true. This picture is sharper :

http://photojournal.jpl.nasa.gov/jpeg/PIA06109.jpg

But you're right, it is certainly the sharpest view of THIS side of Titan I have seen yet. Compare with these pictures:

http://photojournal.jpl.nasa.gov/jpeg/PIA06086.jpg

and from Keck:

http://www2.keck.hawaii.edu/science/titan/031225_Kp_256.png

Anyway, I think Cassini's close approach images will be even blurrier than those of july 2nd. The only hopes I have is for very large features on the terminator. Does anyone know if closest approach is over the terminator?

[SFJCody]

I just put together a gif animation from the CB3 images. Could the bright, dark centered feature in the middle of the disc be a ray-crater? The polar activity looks interesting too...


Click here for a full size Titan approach anim

Half size

Quarter size:

[hendric]

Wow, those light areas within the dark areas sure look alot like islands!



We saw river-like featuers on the other hemisphere, maybe now we'll get oceans with real islands!

[djellison]

Holy CACK

http://saturn.jpl.nasa.gov/multimedia/imag...5/N00023183.jpg

Doug

[Guest_Sunspot_*]

There's a very sharp boundary between the light and dark regions in that image.

[pioneer]

Are those white features in the left part of image clouds?

[Mongo]

They appear very similar to the clouds over the south polar region of Titan during the first (distant) flyby. My guess is that, as it is now summer on the southern Titanian hemisphere, we are seeing some substance (ethane?) subliming off the south polar 'ice' cap.

[OWW]

Could this be the first impact crater?



hmmm, why is the picture not visible? help.

This post has been edited by ObsessedWithWorlds: Oct 26 2004, 07:22 AM

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[Guest_Sunspot_*]

Either post a link to the image or the image itself, When you reply to a post click on the IMG box and paste the URL for the image into it.

[Guest_Sunspot_*]

Is this the feature you were referring to as a possible impact feature? The vaguely circular structure in the first image?

Attached thumbnail(s)

 

[Mongo]

I assume that you mean the very evident circular feature near the right-hand side of the image, below the dark unit. That is a diffraction ring from a dust mote in the camera optics.

Bill

[OWW]

No I didn't mean the dust thingy, I already edited the post. The picture now shows up as an attachment, but the pictureframe above it is still empty....hmmm.

But about the crater, remember back in july the VIMS discovered that the dark stuff was water ice and the bright stuff probably a organic goo layer? And that they doubted that the dark areas were basins?
If the feature I pointed to in my picture is truly an impact crater, the dark floor inside the bright rim should be lower right...? Could there be hope for lakes on Titan, or am I seeing 'canals'?

[djellison]

hmmm, why is the picture not visible? help.

Because you're trying to do an [IMG] straight to the upload folder which the sever wont allow ( with good reason )

Doug

[volcanopele]

We should have a nicely processed image from the approach movie that shows some great features like OWW's crater (which is real) ad the "islands"

[Guest_Sunspot_*]

Anyone else think Titan might turn out to be quite different to what's expected?

In the most recent batch of raw images, how much of what we're seeing is actually the surface? Could some of the lighter patchy areas be clouds in the atmosphere?

[volcanopele]

Anyone else think Titan might turn out to be quite different to what's expected?

In the most recent batch of raw images, how much of what we're seeing is actually the surface? Could some of the lighter patchy areas be clouds in the atmosphere?

Almost all. The bright stuff on the left side of all the Titan images are clouds near the south pole. But otherwise, it is almost all surface features. We've noted many of the larger "islands" as far back as June in the same places.

[David]

Are there any images online of the surface of Earth made with equipment and at wavelengths similar to those used by Cassini in imaging Titan? I'd like to know how various landforms could be expected to appear.
Without any knowledge of the properties of the imaging systems, or indeed of what surface formations could be expected on Titan, all I can say is that when I see a sharp line dividing two zones, one of which is light with a lot of variations in brightness, and the other being uniformly dark without evidence surface features, I am led to suspect that the dark area consists of an unstable, liquid or gelatinous substance, on which evidence of impacts and other changes to the surface is transient. In other words, that sharp line looks awfully like a shoreline to me. But I imagine there are other explanations.

[YesRushGen]

The light/dark contrast reminds me of Iapetus! Could Titan be a larger Iapetus - with an atmosphere?

Or maybe Iapetus was one a smaller Titan whose atmosphere was "blown off" by the solar wind?

Perhaps Titan will one day (far future) resemble Iapetus - since Titan's orbit takes it outside of the relative comfort of Saturn's magnetosphere.

[pioneer]

I doubt it. The dark color from Iapetus likely comes from dust from Phoebe that is mixed in with the ice on the surface.

I think Titan is an active world with tectonic activity. I think this because 1) Ganymede is slightly bigger than Titan, and it has had tectonic activity - though long ago 2) The dark lines in the images look like they were caused by tectonics 3) There are few if any craters, which means something is covering them up.

[Guest_Sunspot_*]

I doubt it.  The dark color from Iapetus likely comes from dust from Phoebe that is mixed in with the ice on the surface.

I think Titan is an active world with tectonic activity.  I think this because 1) Ganymede is slightly bigger than Titan, and it has had tectonic activity - though long ago 2) The dark lines in the images look like they were caused by tectonics 3) There are few if any craters, which means something is covering them up.

Thats a really interesting thought.........


A few interesting features in this closeup of Titan, there do appear to be quite a few fine details visible in the images:

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[David]

A few interesting features in this closeup of Titan, there do appear to be quite a few fine details visible in the images:

Canals on Titan! Or maybe rivers... or glaciers... or... well, I give up. Obviously a very interesting surface. I hope that when we get some altimetry data back it will be easier to correlate these patterns with surface formations. I wonder whether there is orogeny on Titan, and if so, what processes would drive it? Could there be volcanoes, or even subduction? I guess that most places in the solar system mountain ranges are usually just crater walls, except for the volcanic mountains on Mars and Io (and Triton??) and some of the highlands on Venus.
I notice that there are a couple of dust speck rings on these images. Is any information recoverable from them, or should I just assume that everything within the circles is blank, totally lost in that image?

[volcanopele]

A few interesting features in this closeup of Titan, there do appear to be quite a few fine details visible in the images:

Canals on Titan! Or maybe rivers... or glaciers... or... well, I give up. Obviously a very interesting surface. I hope that when we get some altimetry data back it will be easier to correlate these patterns with surface formations. I wonder whether there is orogeny on Titan, and if so, what processes would drive it? Could there be volcanoes, or even subduction? I guess that most places in the solar system mountain ranges are usually just crater walls, except for the volcanic mountains on Mars and Io (and Triton??) and some of the highlands on Venus.
I notice that there are a couple of dust speck rings on these images. Is any information recoverable from them, or should I just assume that everything within the circles is blank, totally lost in that image?

The altimetry data is over the opposite hemisphere from our Ta images. Hopefully though there will be some data over recognizeable dark and bright features on the sub-Saturnian hemisphere.

We can get rid of some of the dust rings. however, it turns out that a few new ones were created during Ta, which can't be removed because our calibration files are from a few years ago. We did collect some flats on this pass so mayb e we can use those.

[pioneer]

Could the image on the right show craters and other topographical features?
link

[volcanopele]

Could the image on the right show craters and other topographical features?
link

possibly. We can't tell for sure without topographic shading, so it can't be ruled in or out. Now do I THINK it is a crater. That image certainly does make it look like there is one but looking at our view of Great Britain (I think that's what the vims view shows), I'm not so sure.

[Mongo]

I've been wondering about something. One of the reasons that we are hearing for the dark areas not being composed of a fluid is that no specular reflection has yet been detected. But we also hear that there are no shadows visible in the image. I take this to mean that even at the wavelengths where IR light passes through the haze, there is still sufficient diffusion (presumably from haze particles) to reduce the sun, as seen from the surface of Titan, to a brighter patch of light in the sky (of unknown extent), rather than the near-point source we see on Earth.

But if this is true, wouldn't specular reflections not be possible (depending on the degree of diffusion caused by passage through the atmosphere of Titan)? If the IR radiation from the Sun is spread over more than a few degrees, then how could any 'glint' of light from even a smooth surface possibly be detected by Cassini?

I am not surprised to hear that the idea that the dark unit was water ice has been abandioned. I never thought that this was likely at all, as it was based on the absence of evidence--in this case, very low albedo at a water ice absorption-line wavelength. But the dark material had a low albedo at all wavelengths, not just H2O absorption lines. This is far more charactoristic of a relatively deep liquid, which absorbs light at all wavelengths, due to its physical depth--note that the Earth's oceans appear dark from space, despite being made of nearly transparent water.

The fact that the spectra of the light and dark units appear so similar (other than the dark units having a lower albedo) could be expained by the presence of particles of light-unit material being suspended in the dark-unit liquid. My guess is that the light-unit material is being constantly eroded from the surface of the light-unit areas, and transported via the 'rivers' to the dark-unit 'oceans'. Note that the dark-unit areas are lightest around their peripheries, and become progressively darker, the further away from the 'shoreline' we look. This is consistent with light-coloured sediment being transported to the 'oceans', and gradually settling with increasing distance from the 'shoreline'.

Well, I suppose that we will find out if I am right, or out to lunch, at tomorrow's press briefing.

Bill

[djellison]

Yeah - the idea of a specular reflection is a bit of a long one to me It requires a point source of light really- and that point source will be fuzzed-fuzzed-fuzzed all the way down to the surface, and then any specular reflection will be fuzzed fuzzed fuzzed back again

I'm not sure if look at an atmospheric window with the ISS means that we'd be seing light that wasnt fuzzed or not.

Also - if you had a lot of large waves - you wouldnt get MUCH of a specular reflection either - as the specularity will be being reflect in a whole lot of different direction, of which you are only one.

Of course, it may be that the sun-cassini-titan angle meant that any spec.ref was simply on what we're all thinking is 'land' and not on what we think is 'ocean'



Doug

[OWW]

What do you think of the VIMS results:

http://photojournal.jpl.nasa.gov/catalog/PIA06982

I think it shows a lot more geological detail than the ISS, or am I misinterpreting the scale? What could that strange 'circular crack' be?

[djellison]

We dont know how big that f.o.v. is

Doug

[OWW]

I think I know where it is. The caption of
http://photojournal.jpl.nasa.gov/catalog/PIA06982
says:

"The image on the left, taken at a wavelength of 2 microns, is the most detailed picture to date of the Titan's surface. It reveals complex landforms with sharp boundaries, which scientists are eager to further study. The image on the right was taken at a wavelength of 1 micron and shows approximately what a digital camera might see."

Well, it's obvious that they mistakenly switched 'left' and 'right image', but that's not the point. That it is most detailed picture of VIMS is.

Now, if you look at the frame I attached from the Ta flyby movie, you see that this is where VIMS stared at Titan during closest approach. Compare the vague features on that globe with this picture to locate it and you'll see it's very detailed indeed:

http://photojournal.jpl.nasa.gov/catalog/PIA06136

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[pioneer]

Did the press conference scheduled to take place today happen? I don't have access to a TV where I'm at, and there haven't been any new releases regarding Titan in the 2 hours since the briefing supposedly ended. Usually there's something posted on the web site by now.

[Guest_Sunspot_*]

Yes they held the briefing and showed the radar images.

They think they do show evidence of lakes of some type of liquid on the surface. In this mode the radar observed about 1% of the surface Also the radar observations were pointing towards the surface of Titan being covered in organic material rather than ice or rock. No obvious sign of imapct craters either. The section observed by the radar also turned out to be quite flat.

There appeared to be signs of some type of volcanic flow, but possibly involving water (cryovolcanism?), These features resembled some of the lava flows found on Venus.

It was hard to get a good view of the images as I was watching NASA TV on dialup But the radar images seemed to show a tremendous amount of detail.

Some of the streaky features seen in the images from the camera could be signs of the wind altering the surface and blowing material around. Also the cloud seen near the south pole may not be made of methane as was earlier suspected.

[volcanopele]

I think I know where it is. The caption of
http://photojournal.jpl.nasa.gov/catalog/PIA06982
says:

"The image on the left, taken at a wavelength of 2 microns, is the most detailed picture to date of the Titan's surface. It reveals complex landforms with sharp boundaries, which scientists are eager to further study. The image on the right was taken at a wavelength of 1 micron and shows approximately what a digital camera might see."

Well, it's obvious that they mistakenly switched 'left' and 'right image', but that's not the point. That it is most detailed picture of VIMS is.

Now, if you look at the frame I attached from the Ta flyby movie, you see that this is where VIMS stared at Titan during closest approach. Compare the vague features on that globe with this picture to locate it and you'll see it's very detailed indeed:

http://photojournal.jpl.nasa.gov/catalog/PIA06136

I would hope their images are more detailed that my map. the pixel scale for that frame was 45 km/pixel

[volcanopele]

Yes they held the briefing and showed the radar images.

They think they do show evidence of lakes of some type of liquid on the surface. In this mode the radar observed about 1% of the surface Also the radar observations were pointing towards the surface of Titan being covered in organic material rather than ice or rock. No obvious sign of imapct craters either. The section observed by the radar also turned out to be quite flat.

There appeared to be signs of some type of volcanic flow, but possibly involving water (cryovolcanism?), These features resembled some of the lava flows found on Venus.

It was hard to get a good view of the images as I was watching NASA TV on dialup But the radar images seemed to show a tremendous amount of detail.

Some of the streaky features seen in the images from the camera could be signs of the wind altering the surface and blowing material around. Also the cloud seen near the south pole may not be made of methane as was earlier suspected.

Volcanism?!?

So may some of those "craters" we found are really volcanic features, which would be great. Or they are craters, but at least there are interesting feautres to look forward to seeing.

[OWW]

I would hope their images are more detailed that my map. the pixel scale for that frame was 45 km/pixel

I meant detailed compared to the ISS images for that same area, not compared to that movie.
I'm not exactly sure which area the VIMS image shows, but it must be somewhere in the red box in the movie and therefore also somewhere in the wide angle ISS image in the following image:

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[OWW]

Circular features with 'cracks' on both Ganymede and Titan. Similar?

Titan


Ganymede

[pioneer]

Circular features with 'cracks' on both Ganymede and Titan. Similar?

That's what I was thinking when I saw this image. I think there has been tectonic and volcanic activity on Titan.

[OWW]

Finally, Radar!!!

http://photojournal.jpl.nasa.gov/catalog/PIA06988

a little bit grainy, but very interesting. I have no idea what it is supposed to represent. Are the meandering white lines rivers or the edges of 'lava' lobes?

[OWW]

And another radar image, but lower resolution:

http://photojournal.jpl.nasa.gov/catalog/PIA06984

[volcanopele]

Finally, Radar!!!

http://photojournal.jpl.nasa.gov/catalog/PIA06988

a little bit grainy, but very interesting. I have no idea what it is supposed to represent. Are the meandering white lines rivers or the edges of 'lava' lobes?

interesting.. somethings looks like ice pack, some things look like lava... I'm scratching my head here. Perhaps Icy lava.

[djellison]

Perhaps Icy lava.

Looks more like lavery Ice to me

Doug

[Guest_BruceMoomaw_*]

First: the resolution per pixel on the 2-micron VIMS image is about 1 km. The tremendously blurry 1-micron shot was taken by it simultaneously of the same region -- which gives you some idea of how much the haze blurs Titan's surface features in even those 1-micron bands which provide best coverage for the ISS photos. It seems very clear that, if they really do want decent IR views of Titan's surface from now on, they'll have to change their plans and utilize VIMS rather than ISS.

Second: The radar view shows something that might or might not be a complex of lakes (the "Halloween Cat") -- at any rate, the material on their floor is extremely radar-dark. Could that, however, be accumulated drifts of dark organic powder instead?

In that connection, it's clear now from both the low radar albedo and the maps of microwave emissivity measured by Cassini that there is a very large amount of organic material on Titan's surface. It was also made entirely clear at the press conference today tht those dark linear streaks that kept showing up all over Titan in the near-IR photos are wind-blown material; the streaks consistently run from west to east, and there are bright teardrop-shaped places where some surface features have blocked the material from being deposited. I think we're looking at dark organic "snow" that has been deposited by Titan's little-changing wind patterns over very long periods of time. It may not be sticky, either -- Dimitrov and Bar-Nun did a study in the April 2002 "Icarus" of the likely consistency of Titan's organic smog particles, and concluded that they have become very hard and non-sticky after a relatively short time of drifting around in the air. This is good news for anyone who fears contamination on Huygens' camera ports; but it also means that the dark organic snow on Titan's surface may not be sticky like terrestrial snow (as I think I think we've all been assuming it would be), but may instead be much like the very fine windblown dust drifts on Mars.

Finally: they are seeing possible signs of both cryovolcanism and tectonics in that one SAR image. The former consists of some very radar-bright flows of material that look distinctly like basalt flows on Venus and Earth, presumably made of ammoniated water ice instead. The latter consists of extremely common parallel ridges -- about 200 meters wide but 100 or more km long -- which look very much like the parallel grooves on Ganymede. But as for what those circular -- and even spiralling -- parallel dark lineations in the 2-micron VIMS image are, I can't imagine. Nature continues to throw us totally unexpected curves throughout the Solar System.

One side note: I'm very skeptical of the tentative announcement that VIMS is indicating the south polar cloud droplets NOT to be methane. It's extremely hard to think of anything else they could be made of, and of course the VIMS team has already had to retract its earlier interpretation that the dark areas were clean water ice. I think their initial analysis of the clouds may similarly be wrong -- perhaps thrown off by contamination of the methane droplets with other organics.

[Guest_BruceMoomaw_*]

One other note: with one possible, very blurry large exception, there is not a single impact crater to be seen on that SAR image -- which covers about 120 by 2000 km. It now seems clear that something has efficiently resurfaced Titan: either internal processes and/or deposited organic drifts.

[Guest_BruceMoomaw_*]

One final thing that hasn't been talked about much yet: Cassini's first altimetry profile shows that -- at least in that place -- it's FLAT. The total altitude range over the 400-km-long altimetry track was only 150 meters; for the last half of it, the variation was only 50 meters.. It may be that another reason we aren't seeing any shadows in the near-IR images is that the entire moon is as flat as a pancake and there AREN'T any topographical shadows to speak of.

http://saturn.jpl.nasa.gov/cgi-bin/gs2.cgi....jpg&type=image

[remcook]

could the hole surface we covered with a very thick layer of 'snow'? stuff like water and CO2 condense at the tropospause and it has been suggested that there must be thick layers of ice.

[volcanopele]

One final thing that hasn't been talked about much yet: Cassini's first altimetry profile shows that -- at least in that place -- it's FLAT. The total altitude range over the 400-km-long altimetry track was only 150 meters; for the last half of it, the variation was only 50 meters.. It may be that another reason we aren't seeing any shadows in the near-IR images is that the entire moon is as flat as a pancake and there AREN'T any topographical shadows to speak of.

http://saturn.jpl.nasa.gov/cgi-bin/gs2.cgi....jpg&type=image

It should be noted that the area covered in the altimetry data from yesterday shows relatively little variation in albedo in our 938 nm filter (see map from Monday). I still would like to altimetry data over a sharp boundary. Is there an altitude difference (or more correctly do albedo boundaries also mark topographic boundaries) between bright and dark terrain? Preliminary examination of VIMS and ISS images suggest that it is possible but obviously we have absolutely NO way of knowing for sure.

[volcanopele]

One other note: with one possible, very blurry large exception, there is not a single impact crater to be seen on that SAR image -- which covers about 120 by 2000 km. It now seems clear that something has efficiently resurfaced Titan: either internal processes and/or deposited organic drifts.

and we only saw three "possible" craters, though again all we can really say about them is that the are cicular features consistent in albedo morphology with craters but without topographic indicators, we can't be sure.

[OWW]

Excellent new image. It really shows how angular the 'islands' are:
http://photojournal.jpl.nasa.gov/catalog/PIA06141

[Guest_Sunspot_*]

A stunning image!!

Some scientists have suggested that we may be looking at windblown material creating the features in the images. But could the wind sculpt features on such a massive scale? If it could wouldn't it take huge spans of time - bearing in mind that we may be looking at a relativley young surface?

[volcanopele]

A stunning image!!

Some scientists have suggested that we may be looking at windblown material creating the features in the images. But could the wind sculpt features on such a massive scale? If it could wouldn't it take huge spans of time - bearing in mind that we may be looking at a relativley young surface?

Wind could have played a role, but even I have some problems with all these islands being aeolian. Can't go into it too much, but there is something very cool going on.

As far as that image goes, you are all very welcome

[tedstryk]

Is it possible that the dark area is a huge swamp or marsh of some sort. That would explain the varying albedo throughout it, as in shallow areas the surface would polk through a lot. It seems it would make sense if Titan still has liquid on its surface but is as flat as it seems.

[Guest_Sunspot_*]

....."something very cool" eh? you could always give us some subtle clues?

[Guest_BruceMoomaw_*]

It's generally believed that the organosynthesis in Titan's atmosphere has slowly precipitated down, over the eons, not only 100 or more meters of solid organic smog particles (which, judging from Dimitrov and Bar-Nun's experiments in the Apr. 2002 "Icarus", may be very hard and non-sticky and therefore capable of being blown around on the surface by the wind) -- but also 100 or more meters' worth of liquid ethane (which should be very resistant to evaporating back into gas on Titan's surface). Could it be that these liquid and solid organic precipitates are mixed into a kind of cryogenic mud on the surface, with the precipitates being originally deposited in rather streaky surface patterns in the first place because of Titan's west-to-east winds, and then later tending to flow into low spots on the local surface?

[volcanopele]

I can't really, mainly because there are so many competing ideas.. For me, this is due to the lackof spectroscopic information about what the materials are on the surface. There are a few theories that are equally possible right now, but without knowing what the surface materials are, we can't distinguish between them. We think we defiitely see tectonics.

[Guest_Sunspot_*]

So it could be anything then?

[SFJCody]

Perhaps the 'islands' slot together - like the 'islands' of Conamara Chaos. Those short, dark, linear features might be something else entirely.

[David]

Congratulations on the image, pele -- it looks wonderfully nice.
Now whenever I look at the "coastline" and the "islands" I find myself thinking that I'm viewing a sea. But it seems that they say that the black stuff isn't liquid and the areas they are in are maybe not even basins. Hopefully a few more flybies and/or Huygens will clear that up. But if it's not liquid, then what is it like? Molasses? Treacle?
These hints about tectonics are certainly interesting...

[remcook]

truely amazing picture! if it works properly, Huygens is going to be so much fun
and all this data that still needs to be processed. we will learn a lot more about this fascinating moon!

[Decepticon]

What hemisphere will be observed during the Dec 13 Flyby?

There are some features south of Xanadu Regio that sort of look like channels. <Yeah I know, wishful thinking!

[Decepticon]

I was bored so I tried something. I know JPL will soon do this, but I can't wait!

I tried to line it up the best I could.

Any tips and tricks would be helpful.

[OWW]

http://photojournal.jpl.nasa.gov/catalog/PIA06995

A new radar image of Titan. Let the speculation begin.

One thing I noticed though is how grainy the Cassini radar images are compared to Magellan ( http://photojournal.jpl.nasa.gov/catalog/PIA00218 ). Is that a result of the radar, Titan itself or the processing?

[volcanopele]

I was bored so I tried something. I know JPL will soon do this, but I can't wait!

I tried to line it up the best I could.

Any tips and tricks would be helpful.

[/IMG]

Tip: wait till I'm done Making a new map incorporating more T0 data and Ta data is my current project. Not sure if you have a tool for converting an orthographic map to simple cylindrical but that might be useful.

[Guest_Sunspot_*]

http://photojournal.jpl.nasa.gov/catalog/PIA06995

A new radar image of Titan. Let the speculation begin.

One thing I noticed though is how grainy the Cassini radar images are compared to Magellan ( http://photojournal.jpl.nasa.gov/catalog/PIA00218 ). Is that a result of the radar, Titan itself or the processing?

The large dark area at the bottom could be a lake perhaps?

[Decepticon]

I was bored so I tried something. I know JPL will soon do this, but I can't wait!

I tried to line it up the best I could.

Any tips and tricks would be helpful.

[/IMG]

Tip: wait till I'm done Making a new map incorporating more T0 data and Ta data is my current project. Not sure if you have a tool for converting an orthographic map to simple cylindrical but that might be useful.

I'm so looking forward to your Map!

What program are you using to do that? Can I achive this in Adobe?

[OWW]

Sorry to bring this old thread back, but this really belongs to Ta and not T3. Thanks to this: http://www.lpi.usra.edu/meetings/lpsc2005/pdf/1939.pdf, I finally managed to find the area photographed by VIMS on Ta on the map created with the ISS camera on Tb: (http://photojournal.jpl.nasa.gov/catalog/PIA06159 ).
The article says the VIMS image is 150 x 150 km. It's amazing how much more detail VIMS can resolve!

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[volcanopele]

Sorry to bring this old thread back, but this really belongs to Ta and not T3. Thanks to this: http://www.lpi.usra.edu/meetings/lpsc2005/pdf/1939.pdf, I finally managed to find the area photographed by VIMS on Ta on the map created with the ISS camera on Tb: (http://photojournal.jpl.nasa.gov/catalog/PIA06159 ).
The article says the VIMS image is 150 x 150 km. It's amazing how much more detail VIMS can resolve!

Yep, that's it

[TheChemist]

Can anyone indicate where this radar-revealed crater is located in previous imagery ?

Huge crater seen during Titan fly-by

Edit: nevermind, I found the relevant thread