Voyager mosaics and images of Jupiter, A fresh look at some ancient stuff Options

[wildespace]

Wow, my mind blown! I strongly suggest you submit the image to APOD, it needs to be seen by lots of people.

[dilo]

I agree with wildespace, is absolutely worth to submit!

[djellison]

Wow, my mind blown! I strongly suggest you submit the image to APOD, it needs to be seen by lots of people.

APOD don't tend to take submissions. They see stuff they like and publish it themselves, without actually asking.

That's what they've done with a couple of things I've made, anyway.

[tedstryk]

Ditto...in fact, they've taken my stuff without contacting me and erroneously declaring it in the public domain. My experiences have been decidedly mixed.

[JRehling]

I'm particularly taken with the Europa portion of the image. Europa (among many other worlds) exhibits some pronounced phase angle effects, and the best imagery was collected at a variety of phase angles, making the best maps prone to artifacts, and most off-the-shelf rendering of those maps look false because they lack those effects. Very nice global images, even at this relatively low resolution, could be used to: characterize the effects; normalize higher resolution images into a more seamless global map; use the map for rendering views of the globe through arbitrary viewing geometries.

Maybe a big project, but for now, I certainly admire this view of Europa.

[djellison]

And just to further things a little -they took a movie of mine, without asking, compressed it so badly it was ruined, improperly credited the source, improperly cited the source of the data, screwed up the description...etc etc etc..... APOD is not something to aspire to in my opinion.

[machi]

Really gorgeous image Björn!

[nprev]

No worries; Bjorn has done better than APOD with this one.

[Bjorn Jonsson]

Jupiter from Voyager 2:



This is a mosaic of 12 color images obtained by Voyager 2 on July 5, 1979 beginning at 15:54 and ending at 16:29. At this time Voyager 2 was 4.5 million km from Jupiter's center; the resolution is 45 km/pixel. Each color image was composed from orange and violet images plus synthetic green. The end result is approximately natural color and contrast. Apart from minor improvements, the processing is similar to the processing of the earlier mosaics I posted here.

This mosaic shows a huge amount of interesting details. There are fairly irregular filamentary cloud structures in the north polar region, gravity waves at several locations near the equator, brown barges can be seen, big and bright plumes, various small spots and ovals and a turbulent region at lower right that is just west of the Great Red Spot. And perhaps most interesting: Amalthea is visible at lower left (it's very dark).

It's interesting how 'Cassini-like' the Voyager data can become with careful processing.

Compared to my other Voyager mosaics of Jupiter, this one is slightly unusual because I wasn't searching for any specific target (e.g. satellite transits, the Great Red Spot or something else). I decided to make a more or less random selection of source data to process. The only criteria were that I wanted images that could be mosaicked and a resolution of roughly 35-50 km/pixel.

[tedstryk]

It's interesting how 'Cassini-like' the Voyager data can become with careful processing.

I love this mosaic! And I fully agree. Voyager is very competitive with modern imagery if you can successfully remove the layer of "gunk" on top of it without damaging what's "underneath."

[Ian R]

Breathtaking work, Bjorn!

[geckzilla]

Hi, I'm new here. I have mostly been processing Hubble data for the past couple of years but I sometimes check out Cassini or some other data. I try to focus on the less popular stuff that might never see the light of day and it seems like the planetary data gets a lot more attention from folks like you, so I avoid it a little. That, and planets move so much!

Anyway, I was searching for an image of a backlit Jupiter similar to Cassini's amazing backlit portraits of Saturn. I found this page, which features an interesting picture of such a thing, although obviously not of such high quality. I'm sure you all are a lot more familiar with the problems some of the Voyager images have. You can see there are multiple images of the limb in the same channel for both color channels. Due to the nature of the image I decided it was possible to correct these errors somewhat and this is the result. Note the ring itself is still uncorrected but it's not so bad.

Do you know of any other pictures of Jupiter off hand which show the atmosphere illuminated from behind like this? There is another set in OPUS I am considering doing this with but I am very curious about just how accurate the colors for this image could possibly be. Obviously just working with orange and violet filters is a far cry from a nice RGB image, but the inferred color here interests me. On the far side of the limb away from the sunlight are some dimly illuminated cloud tops. It would seem that the higher clouds are redder while the lower parts are more blue. Is this right? I have no idea! I don't know if the stark difference in hue is an error by me or a real phenomenon. Maybe a little of both!

[JohnVV]

This is a Voyager thread
So the voyager data is here

search page
http://pds-imaging.jpl.nasa.gov/search/search.html
the Voy 1 and 2 data is at the bottom of the page
http://pds-imaging.jpl.nasa.gov/data/

using the atlas search for Voyager 1
leaving Jupiter "Voy 1 "

http://pds-imaging.jpl.nasa.gov/data/atlas...//c1643603.jpeg
http://pds-imaging.jpl.nasa.gov/data/atlas...//c1647952.jpeg
MAGE_TIME = 1979-03-14T14:45:33Z
http://pds-imaging.jpl.nasa.gov/data/atlas...//c1666247.jpeg

this is the image you want ???
Voy2
IMAGE_TIME = 1979-07-11T00:03:58Z
http://pds-imaging.jpl.nasa.gov/data/atlas...//c2069127.jpeg

CODE

wget -O c2069127.img 'http://pds-imaging.jpl.nasa.gov/pds/prod?q=OFSN+%3D+/data/voyager/vg_0008/extras/pds/jupiter/c2069xxx//c2069127.img+AND+RT+%3D+RAW'
wget -O c2069127.img_label 'http://pds-imaging.jpl.nasa.gov/pds/prod?q=OFSN+%3D+/data/voyager/vg_0008/extras/pds/jupiter/c2069xxx//c2069127.img+AND+RT+%3D+PDS_LABEL'
wget -O c2069127.img 'http://pds-imaging.jpl.nasa.gov/pds/prod?q=OFSN+%3D+/data/voyager/vg_0025/extras/pds/jupiter/c2069xxx//c2069127.img+AND+RT+%3D+RAW'
wget -O c2069127.img_label 'http://pds-imaging.jpl.nasa.gov/pds/prod?q=OFSN+%3D+/data/voyager/vg_0025/extras/pds/jupiter/c2069xxx//c2069127.img+AND+RT+%3D+PDS_LABEL'

[elakdawalla]

John, the image posted above is based on Voyager data -- click it and you'll get to the Flickr page that says it's made of C2069131 and C2069127.

Nice work, geckzilla, and welcome to the forum. I have also struggled with high-phase Voyager images and am not sure how real or fake any color I produce is, but it's at least a visually pleasing product!

[geckzilla]

Thanks for the tips, John, and the welcome, Emily.

I should have put the image ID's in the post, though, so my bad. I found that using OPUS was quite a bit friendlier than plain old PDS. Honestly, I don't even know what "OPUS" stands for. Outer Planet U? Search? Anyway, yeah, I am a total newb. I know easier when I spot it, though.