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Voyager mosaics and images of Jupiter, A fresh look at some ancient stuff
Ian R
post Jul 12 2011, 09:45 PM
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While browsing through the OPUS PDS archives, I came across this nice wide-angle view of Jupiter — including the GRS and a moon shadow — taken by Voyager 2:

Attached Image


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machi
post Mar 1 2012, 12:24 AM
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Hi-res (~10 km/pix) mosaic of Jovian northern whirls and some other images of Jupiter from Voyager 2:



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elakdawalla
post Mar 1 2012, 01:49 AM
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I love that little black dot at the right! It looks like a hole punched through the clouds. Great work, machi!


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machi
post Mar 1 2012, 05:31 PM
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Thanks!

"It looks like a hole punched through the clouds"
I think, that it's actually hole punched through the clouds. Or possibly more accurately - eye of a storm (cyclone).


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AndyG
post Mar 1 2012, 07:23 PM
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It looks a bit too dark and regular to me. I note it's about the same size as Amalthea's shadow would be ... a possibility?

Edit: No ... too far off the equator, I think, referring to the location photo placing this view on the wider globe. What about Himalia?

Andy
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ugordan
post Mar 1 2012, 07:26 PM
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Hmm, it does look a bit too dark to be a cloud.


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john_s
post Mar 1 2012, 08:17 PM
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Pretty sure it is a cloud (or cloud hole), though- it's at the center of subtle concentric features in the surrounding clouds.

John
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Bjorn Jonsson
post Mar 1 2012, 08:18 PM
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QUOTE (machi @ Mar 1 2012, 05:31 PM) *
Thanks!

"It looks like a hole punched through the clouds"
I think, that it's actually hole punched through the clouds. Or possibly more accurately - eye of a storm (cyclone).

Looking at the original images I agree. Also I'm pretty sure this can't be a satellite shadow anyway. The small inner satellites like Amalthea are too close to Jupiter to cast shadows this far from the equator and the more distant small satellites (e.g. Himalia) are too small and distant to cast dark shadows.

Very nice images.
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machi
post Mar 1 2012, 08:23 PM
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Darkness of this feature is caused by contrast enhancing procedure. So it's relatively dark, not absolutely.
Based on shape of this feature and its surroundings, it's central part of cyclone (anticlockwise rotation in northern hemisphere, in North-North Temperate Belt).


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AndyG
post Mar 1 2012, 10:08 PM
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Following a brief trip to Excel (and back) I am more than happy to accept this as a weather system!

Andy (still, a ~150km hole in a cyclone is something else!)
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JohnVV
post Mar 1 2012, 11:52 PM
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a close up
[attachment=26501:Screenshot.png]
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dilo
post Mar 2 2012, 07:02 AM
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Herebelow a mosaic zooming on the dark spot (I modified color dominance and smoothed John closeup):
Attached Image

Edit: added an intermediate image between last two...


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vikingmars
post Mar 7 2012, 12:14 AM
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QUOTE (dilo @ Mar 2 2012, 08:02 AM) *
Herebelow a mosaic zooming on the dark spot (I modified color dominance and smoothed John closeup):

Well : this was just the beginning...
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laugh.gif
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Bjorn Jonsson
post Mar 29 2012, 12:10 AM
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A new Voyager 2 mosaic of the Great Red Spot:
Attached Image
Attached Image

In the version at left contrast has been increased and the image sharpened to enhance the visibility of small scale details. The one at right has approximately natural color and contrast.

These images are created from the same source data as this well known image but the new version is better.

The mosaic is composed of six color images each of which is created from one set of orange, green and violet images, thus a total of 18 images was used.

The images were obtained when Voyager 2 was 2.7 million km from Jupiter's center. Earlier I posted a mosaic of the Great Red Spot obtained at closer range that covered a somewhat smaller area. This mosaic was obtained about 30 hours (3 Jovian rotations) earlier than the closer-range mosaic. It's interesting to compare the two mosaics - the changes in this short period of time are remarkable.

The processing is similar to the processing described earlier in the thread (perhaps slightly improved).

And finally a relatively quick and dirty color composite using wide angle context images obtained at the same time:
Attached Image

Color and overall contrast is natural but the visibility of small scale details has been improved a bit using an unsharp mask. Significant time passed between the orange/green images and the violet image. This made color processing a bit difficult and in fact I only did rather rudimentary color correction which means that the color near the terminator and also near the limb is a bit less accurate than the color near the center of the image.
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tedstryk
post Mar 29 2012, 01:46 AM
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Simply incredible, Bjorn. That is the most beautiful Jupiter mosaic yet.


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