Juno, perijove 12, April 1, 2018 Options

[Sean]

I wondered what size 'Anticyclonic White Oval WS-4' was so I asked astronomer Ronald Drimmel ( @rdrimmel ) on Twitter who referred to Damian Peach's portrait of Jupiter taken the day before Juno's encounter.

We managed to identify the area photographed by Juno from Damien's observation and came away with the answer 'Slightly larger than Earth's Moon'...







I've also made some interpolations of Perijove 12 features using Gerald's reprojections...

Animation 1

Animation 2

[Gerald]

Btw, here the links to the reprojections Seán used for his wonderful animations:
Vantage point over WS-4.
Vantage point over northern FFRs.

In those animations, I think, besides cloud motion, we see evidence for parallax. This would provide us with a geometrical basis to estimate the height of the bright "popup clouds".

[mcaplinger]

I wondered what size 'Anticyclonic White Oval WS-4' was...

This can be determined directly from the Junocam image to some level of accuracy. The metadata says the s/c altitude for this image was 8681.9 km, so the resolution at nadir is 8681.9*673e-6 = 5.8 km/pixel. WS-4 is about 900 pixels across on its long axis in the raw frames, so that's 5220 km (ignoring perspective effects.)

[mcaplinger]

The second set of PJ12 images, including the GRS images, are now on missionjuno. The rest of the images continue to come down slowly.

[Gerald]

Enhanced reprojections of PJ12, part 2, PNG version.

I'll upload according JPGs here, in reverse order:

#102, and #101:

[Gerald]

#100:

[Gerald]

#99:

[Gerald]

#94:


(#95 to #98 are methane band images)

[Gerald]

#93:


#92:

[Gerald]

#91:

[Gerald]

#90:

[Gerald]

#89, and #88:

[Gerald]

and #87:


Interesting, the small reddish eddies in the latitudes close to the northern and southern edge of the GRS, and of course the extended track of mesoscale waves in #90.

[Sean]

PJ12_99




...made with Brian Swift's Mathematica pipeline

[Gerald]

Here, for completeness, are my Perijove-12 drafts, without trajectory data, nor shape model nor with patched camera artifacts, just decompanded and geometrically aligned as if the target would be at infinity. Parameters are according to a heuristics derived from earlier perijoves. No perijove specifics have been used, not even Juno's perijove-specific rotation period. It's instead based on a fixed number of interframe delays per Juno rotation period. Very close-up portions of Jupiter are therefore misaligned.

Next, I'll make an attempt to animate parts of the GRS, and of the accompanying turbulence.