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Cloud hunting between flybys, more distant views
ngunn
post Feb 19 2009, 01:59 PM
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The latest shots of Mezzoramia and environs are nice:
http://saturn.jpl.nasa.gov/multimedia/imag...7/N00131391.jpg
I'm not sure if that's a cloud streak on the left.
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volcanopele
post Feb 19 2009, 04:29 PM
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Yeah, those are clouds.


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remcook
post Feb 19 2009, 07:16 PM
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Huh? Are they even aligned E-W? Maybe I'm looking at something else...
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Juramike
post Feb 19 2009, 07:56 PM
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Same image that Nigel posted, but gamma contrasted, rotated, and annotated view. N is roughly towards the top.

Attached Image



The cloud streaks are faint vertical in this image (at the end of the red arrows). (Hard to tell absolute orientation at these high latitudes, but I think they might be closer to N-S than E-W).

-Mike


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belleraphon1
post Feb 20 2009, 01:44 AM
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Mike...

as always your work blows me away... I have to get a new ink cartridge and print head just to keep up with your Huygens
image products...

Are we not all just chomping at the bit to see how the weather changes come Equinox!!!! Will we start seeing clouds in the 'tropics'?

Craig
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remcook
post Feb 20 2009, 08:14 AM
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Exactly... did wind patterns change in the troposphere? Or is it the projection?
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volcanopele
post Feb 20 2009, 10:11 AM
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Before people start speculating too much, those streaks are E-W. They are just a tad close to the limb there.


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ngunn
post Feb 20 2009, 11:16 AM
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From 'looking ahead' for 103 (and 104 is now there too):

"On Feb. 15, ISS will acquire several satellites observations. These include a nine-hour long observation of Titan where ISS will search for clouds and hopefully watch them move across the southern part of the sub-Saturn hemisphere. This distant observation will also provide an opportunity to look at Mezzoramia, a dark albedo region in Titanís mid-Southern latitudes. Distance to Titan varies during this long observation between 1.2 and 1.37 million kilometers"

This suggests that there should be many more images like the one we've been discussing. Were they acquired?

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Juramike
post Feb 20 2009, 12:01 PM
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QUOTE (volcanopele @ Feb 20 2009, 05:11 AM) *
Before people start speculating too much, those streaks are E-W. They are just a tad close to the limb there.


Slightly OT, but is there a way to light up a lat/long grid on a planetary body in Celestia?
Also, is there a good surface feature (ISS) map of Titan add-on available for Celestia?


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helvick
post Feb 20 2009, 05:11 PM
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Custom overlays allow you to do this Mike : http://www.lepp.cornell.edu/~seb/celestia/...ison/grids.html
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volcanopele
post Feb 20 2009, 06:13 PM
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Version 1.6, currently in beta, provides support for various overlays, such as body axes, sun direction, and a lat/lon grid.

I have a custom add-on that includes a pair of nice Titan maps that I have been trying to get to more cleaned up state for public release.


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Juramike
post Feb 21 2009, 03:51 PM
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QUOTE (helvick @ Feb 20 2009, 12:11 PM) *
Custom overlays allow you to do this Mike : http://www.lepp.cornell.edu/~seb/celestia/...ison/grids.html


Well, thanks for the tip. I installed it and now I can do lat/lon grids for everything but Titan.




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titanicrivers
post Feb 22 2009, 05:57 PM
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However one can easily get a blank grid on a planet (say Mars) in Celestia, save it and using coordinates from an existing Titan map (say PIA02147), layer it on Titan images matching several locations using longitude and latitude. Such was done in the animation below. It helps to have the Titan raw image rotated so North is up, same with the Celestia grid.
By the way those streaks sure look like artifacts to me!
Attached Image
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ngunn
post Feb 22 2009, 06:57 PM
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I think that grid needs rotating clockwise quite a bit.
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titanicrivers
post Feb 22 2009, 07:24 PM
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QUOTE (ngunn @ Feb 22 2009, 12:57 PM) *
I think that grid needs rotating clockwise quite a bit.

HA! (I knew you would catch me!). Been looking at that too. I'm not sure the raw image itself it righted with north up correctly. Lets see what a little tweaking can do.
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