IPB

Welcome Guest ( Log In | Register )

6 Pages V  < 1 2 3 4 > »   
Reply to this topicStart new topic
Juno, perijove 12, April 1, 2018
Sean
post Apr 4 2018, 05:00 PM
Post #16


Member
***

Group: Members
Posts: 674
Joined: 10-November 15
Member No.: 7837



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



--------------------
Go to the top of the page
 
+Quote Post
Gerald
post Apr 4 2018, 05:34 PM
Post #17


Senior Member
****

Group: Members
Posts: 2135
Joined: 7-December 12
Member No.: 6780



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".
Go to the top of the page
 
+Quote Post
mcaplinger
post Apr 4 2018, 05:45 PM
Post #18


Senior Member
****

Group: Members
Posts: 1721
Joined: 13-September 05
Member No.: 497



QUOTE (Sean @ Apr 4 2018, 09:00 AM) *
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.)


--------------------
Disclaimer: This post is based on public information only. Any opinions are my own.
Go to the top of the page
 
+Quote Post
mcaplinger
post Apr 4 2018, 10:04 PM
Post #19


Senior Member
****

Group: Members
Posts: 1721
Joined: 13-September 05
Member No.: 497



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


--------------------
Disclaimer: This post is based on public information only. Any opinions are my own.
Go to the top of the page
 
+Quote Post
Gerald
post Apr 5 2018, 12:27 AM
Post #20


Senior Member
****

Group: Members
Posts: 2135
Joined: 7-December 12
Member No.: 6780



Enhanced reprojections of PJ12, part 2, PNG version.

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

#102, and #101:
Attached Image
Attached Image
Go to the top of the page
 
+Quote Post
Gerald
post Apr 5 2018, 12:28 AM
Post #21


Senior Member
****

Group: Members
Posts: 2135
Joined: 7-December 12
Member No.: 6780



#100:
Attached Image
Go to the top of the page
 
+Quote Post
Gerald
post Apr 5 2018, 12:29 AM
Post #22


Senior Member
****

Group: Members
Posts: 2135
Joined: 7-December 12
Member No.: 6780



#99:
Attached Image
Go to the top of the page
 
+Quote Post
Gerald
post Apr 5 2018, 12:30 AM
Post #23


Senior Member
****

Group: Members
Posts: 2135
Joined: 7-December 12
Member No.: 6780



#94:
Attached Image


(#95 to #98 are methane band images)
Go to the top of the page
 
+Quote Post
Gerald
post Apr 5 2018, 12:32 AM
Post #24


Senior Member
****

Group: Members
Posts: 2135
Joined: 7-December 12
Member No.: 6780



#93:
Attached Image


#92:
Attached Image
Go to the top of the page
 
+Quote Post
Gerald
post Apr 5 2018, 12:34 AM
Post #25


Senior Member
****

Group: Members
Posts: 2135
Joined: 7-December 12
Member No.: 6780



#91:
Attached Image
Go to the top of the page
 
+Quote Post
Gerald
post Apr 5 2018, 12:35 AM
Post #26


Senior Member
****

Group: Members
Posts: 2135
Joined: 7-December 12
Member No.: 6780



#90:
Attached Image
Go to the top of the page
 
+Quote Post
Gerald
post Apr 5 2018, 12:37 AM
Post #27


Senior Member
****

Group: Members
Posts: 2135
Joined: 7-December 12
Member No.: 6780



#89, and #88:
Attached Image
Attached Image
Go to the top of the page
 
+Quote Post
Gerald
post Apr 5 2018, 12:41 AM
Post #28


Senior Member
****

Group: Members
Posts: 2135
Joined: 7-December 12
Member No.: 6780



and #87:
Attached Image


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.
Go to the top of the page
 
+Quote Post
Sean
post Apr 5 2018, 01:05 AM
Post #29


Member
***

Group: Members
Posts: 674
Joined: 10-November 15
Member No.: 7837



PJ12_99




...made with Brian Swift's Mathematica pipeline








--------------------
Go to the top of the page
 
+Quote Post
Gerald
post Apr 5 2018, 02:15 AM
Post #30


Senior Member
****

Group: Members
Posts: 2135
Joined: 7-December 12
Member No.: 6780



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.
Go to the top of the page
 
+Quote Post

6 Pages V  < 1 2 3 4 > » 
Reply to this topicStart new topic

 



RSS Lo-Fi Version Time is now: 17th August 2018 - 07:26 PM
RULES AND GUIDELINES
Please read the Forum Rules and Guidelines before posting.

IMAGE COPYRIGHT
Images posted on UnmannedSpaceflight.com may be copyrighted. Do not reproduce without permission. Read here for further information on space images and copyright.

OPINIONS AND MODERATION
Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators.
SUPPORT THE FORUM
Unmannedspaceflight.com is a project of the Planetary Society and is funded by donations from visitors and members. Help keep this forum up and running by contributing here.