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Voyager 1 Saturn movies
owlsyme
post May 17 2022, 03:16 PM
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I've been making some more movies -

Dione v0.60 - https://i.imgur.com/7ARNCEd.mp4 - need to adjust brightness on some.

I don't have the ability to center Saturn yet, so will make do with slideshows for now - some of the ring shots are really nice - https://i.imgur.com/1oLem3f.mp4

This doesn't compete with Cassini, of course, but for me, it captures the excitement of seeing these moons and images for the first time.

I'm aiming to have a semi-complete movie done by June 1, with j1 s1 u2 n2. Will finish Voyager 2 after that.

Then someday, will make a color movie of Saturn - there are plenty of pics for that. smile.gif
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StargazeInWonder
post May 17 2022, 05:54 PM
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That's fantastic, Owl! Dione was one of the wonderful sights of the Voyager 1 Saturn flyby, and those linear features were a mystery until Cassini. Seeing those individual frames brings back thoughts of the original smudgy color images.

The ring images are beautiful and shocked the world. This is a reminder that Voyager 1 only gave us a one-way look, so unlike the endless views from every angle that Cassini provided.

Thanks so much!
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owlsyme
post May 17 2022, 08:00 PM
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Thanks! I still haven't really delved into Cassini's images so don't know/remember what the full moon looks like. smile.gif

Here's Iapetus - will need to do some cropping/zooming on this one - such an interesting moon, just a bit too far away from the camera...

Attached File  Saturn_Voyager1_Iapetus_Narrow.mp4 ( 313.76K ) Number of downloads: 117


There are about 15,000 images of Saturn and the rings from Voyager 1 alone, so picking out the 'best' ones is challenging in itself!

I have around 3 minutes of footage of this flyby - will post that to YouTube soon.

Attached File(s)
Attached File  Saturn_Voyager1_Mimas_Narrow.mp4 ( 1.08MB ) Number of downloads: 94
 
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owlsyme
post May 20 2022, 09:23 AM
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Okay, here's the complete Voyager 1 flyby of Saturn - it's 4 mins. Be sure to click the gear and set the quality to 720p...

https://www.youtube.com/watch?v=xC8yt4WRT_A

The slideshow segments don't show up at full-resolution for me, especially of the rings - I guess it's an issue with video compression and download speeds. The mp4 video I uploaded is 24MB.

The video description has timestamps for the different segments and width of the moons relative to Earth's -

Contents:
00:00:00 Approach
00:00:21 Storm in south
00:00:31 Titan (large moon with thick atmosphere) (148%)
00:00:51 Rings
00:01:59 Tethys (a death star moon) (30%)
00:02:09 Mimas (another death star moon) (12%)
00:02:22 Dione (moon with spider-like cracks) (32%)
00:02:42 Iapetus (black and white moon) (42%)
00:02:52 Rhea (another moon with cracks) (44%)
00:03:23 Retreat

The highlights to me working on this project were seeing the small storms on Saturn, the textures in the rings as they rotate, the black and white moon Iapetus, the layered atmosphere of Titan (unless that's motion blur?), the cracked moons of Rhea and Dione, and some of the amazing Saturn+ring shots.

This is version 0.60 - later versions will have colors movies of Saturn and Titan, crops, etc.

Also will include the trajectory plots - generated with SPICE and the planet/spacecraft positions -

Attached Image


And here's that shot of Titan (C3492126) - is this just motion blur?

Attached Image


Thanks to Bjorn Jonsson for img2png, which is what converts the Voyager img files to pngs. The rest is done with https://github.com/bburns/PyVoyager.

The next step will be to work on a compilation of the j1s1u2n2 flybys - aiming for June 1 release. Then make a complete movie with j2s2.
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StargazeInWonder
post May 21 2022, 05:00 AM
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A wonderful job of compilation!

The image of Titan is not, I think, demonstrating motion blur. Those are layers of haze with different characteristics, and the upper ones are blue in color composites. Cassini provided a lot more information about the nature of the layers, which vary over time and latitude.

https://www.nasa.gov/mission_pages/voyager/...2238_13172.html
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owlsyme
post May 21 2022, 07:21 AM
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Thank you!

Yeah I googled that image number but came up empty - I figured it would have been referenced in a NASA page somewhere?

Work has picked up and I probably won't be able to work on the compilations for a while. I'm not very good at multitasking - and this project is really absorbing!

Hopefully I'll be able to get back to it later this summer though.
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StargazeInWonder
post May 21 2022, 08:02 PM
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This release is a closer match to the image that you posted. Similar, but not the same. These must have been taken very close in time, and I guess the one that you posted utilized the violet filter.

https://photojournal.jpl.nasa.gov/catalog/PIA01533

I'm not sure why there are releases in color that are so similar to but don't include your image. Maybe the coverage near closest approach did not permit color composites for all the violet images.
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owlsyme
post May 21 2022, 09:24 PM
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Yeah, there it is!

The image sequence looks like this -

C3492035,6113,Saturn,Voyager1,Titan,1980-11-12T05:01:22,Wide,Violet,IRIS integration in TITAN's atmosphere
C3492041,6113,Saturn,Voyager1,Titan,1980-11-12T05:06:10,Wide,Orange,IRIS integration in TITAN's atmosphere
C3492047,6113,Saturn,Voyager1,Titan,1980-11-12T05:10:58,Wide,Clear,IRIS integration in TITAN's atmosphere
C3492053,6113,Saturn,Voyager1,Titan,1980-11-12T05:15:46,Wide,Clear,IRIS integration in TITAN's atmosphere
C3492126,6113,Saturn,Voyager1,Titan,1980-11-12T05:42:10,Wide,Violet,IRIS integration in TITAN's atmosphere <---
C3492512,6113,Saturn,Voyager1,Dark,1980-11-12T08:42:58,Narrow,Clear,Dark current calibration
C3492515,6113,Saturn,Voyager1,Dark,1980-11-12T08:45:22,Wide,Clear,Dark current calibration
C3492526,6113,Saturn,Voyager1,Dione,1980-11-12T08:54:10,Narrow,Clear,Optical navigation


I guess that was the last close approach picture, and maybe they got lucky catching the edge of the atmosphere. And it was still a good ways to Saturn, hence the 3 hr gap?

Although, the dataset I used is the PDS, which is a subset of the full EDR data. And I think they have different file numbering schemes. I might eventually switch to the EDR data.
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john_s
post May 21 2022, 11:48 PM
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QUOTE (StargazeInWonder @ May 21 2022, 02:02 PM) *
This release is a closer match to the image that you posted. Similar, but not the same. These must have been taken very close in time, and I guess the one that you posted utilized the violet filter.

https://photojournal.jpl.nasa.gov/catalog/PIA01533

I'm not sure why there are releases in color that are so similar to but don't include your image. Maybe the coverage near closest approach did not permit color composites for all the violet images.


I think the color image is the same one- they applied a pseudocolor scheme to the original violet image to mimic the colors seen in lower resolution images (which always bugged me a bit).

John
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StargazeInWonder
post May 25 2022, 01:58 AM
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Thanks, John. That seems right. It probably yields a reasonably realistic result, but, yes, cheating a bit.
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