Europa Flyby - PJ45, September 29, 2022 |
Europa Flyby - PJ45, September 29, 2022 |
Oct 3 2022, 02:10 PM
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#76
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Senior Member Group: Members Posts: 1637 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
ZLD - the color info is essentially coming from Bjorn's processing (actually a very early map of his), though I've been manipulating the contrast. He has a much better map from 2015 that I could try for comparison. There are areas where the color varies for example in the western hemisphere. Some color variation seems apparent within the area of the Juno images as well.
Daniele - thanks for the neat hi-res image/map from Paul Schenk. -------------------- Steve [ my home page and planetary maps page ]
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Oct 3 2022, 04:35 PM
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#77
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Senior Member Group: Moderator Posts: 3233 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
Found a place to put the product I produced (there are subtle differences from what I posted earlier as I worked to improve the control point network(s):
https://flic.kr/s/aHBqjA9D8g Found a much better way of tying these images together in ISIS. First I created control point networks for each observation separately using Autoseed then I registered each point using pointreg. This control point network scheme is similar to what we do with CaSSIS, which makes sense given that both are similar push-frame cameras. so I have four separate control networks for the four images. I then used cnetmerge to combine the two. It was important to make sure that the points in each network have different names, so when they were generated by autoseed, the points have the observation name as a prefix, much like CaSSIS. I then used qnet to interactively tie together the four networks by finding common points between them. The perspective shift and the pointing offsets made it a lot less messy to just do this by hand. This also gave me a chance to fix some points to a Voyager/Galileo basemap. The biggest limitation to this process was the fact that the basemap isn’t perfect and there are clearly offsets between the higher resolution images in the mosaic and the lower resolution background image in the region from Galileo G2/C9. This is something that the JunoCAM observations will be able to remedy to have a better product for Europa Clipper planning. -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Oct 3 2022, 04:44 PM
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#78
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Member Group: Members Posts: 241 Joined: 16-May 06 From: Geneva, Switzerland Member No.: 773 |
These JUNO images are fantastic, especially since they cover parts of Europa not well seen by Voyager and Galileo at good resolution. It gives also nice context to some late Galileo mosaics, especially from orbits I25 and E26. The I25 mosaic has been used to fill a gap in most maps, but I have never seen the E26FLOWS01 mosaic used in any map, probably because the poor resolution of the background impaired to locate it precisely. This is now possible thanks to JUNO. There is somewhere another pic extending E26FLOWS to the North-East, but I could not find it. I copied the Galileo mosaics from: https://rgcps.asu.edu/Galileo/ (from ASU), one of the rare site where Galileo pics can still be found (at least by me). One disappointment is that the new images do not help to definitively solve the question of the nature of Midir, a probable big impact scare.
These are some personal thoughts. Thanks to all of you who processed these images. It is a real pleasure to go through them. Take care and stay healthy. Best regards, Marc. |
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Oct 5 2022, 08:25 PM
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#79
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Member Group: Members Posts: 241 Joined: 16-May 06 From: Geneva, Switzerland Member No.: 773 |
And here is the image taken by the JUNO Stellar Reference Unit (SRU):
https://www.jpl.nasa.gov/news/nasas-juno-ge...ers-moon-europa Best regards, Marc. |
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Oct 5 2022, 09:35 PM
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#80
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Senior Member Group: Moderator Posts: 3233 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
adjusting my JIRAM backplane script now to work with SRU images...
-------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Oct 6 2022, 12:30 AM
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#81
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IMG to PNG GOD Group: Moderator Posts: 2250 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
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Oct 7 2022, 08:55 PM
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#82
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Member Group: Members Posts: 444 Joined: 1-July 05 From: New York City Member No.: 424 |
Emily Lakdawalla has been tweeting from the Division for Planetary Sciences meeting in London, Ontario.
https://twitter.com/elakdawalla/status/1578455575905546241 QUOTE Emily Lakdawalla
@elakdawalla A super fast flyby through the Europa flyby of Juno by Scott Bolton is my last #DPS2022 talk. SO MUCH DATA WOW. Europa folks will be chewing on this for years. Juno Ganymede flyby Science paper has been submitted, and lots of other papers will follow. As neat as the images are, the other kinds of data — microwave radio penetrating ice, plasma waves and other in situ instruments picking up clues to subsurface ocean — are Juno’s forte. This post has been edited by Tom Tamlyn: Oct 7 2022, 08:56 PM |
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Oct 7 2022, 09:11 PM
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#83
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Member Group: Members Posts: 444 Joined: 1-July 05 From: New York City Member No.: 424 |
Incidentally, in case you're wondering, Scott Bolton's talk, part of today's "Fire and Ice: Europa and Aurorae" session, does not have a posted abstract.
H/T to member marsbug for instructions on how to search the meeting schedule. http://www.unmannedspaceflight.com/index.p...st&p=258754 |
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Oct 14 2022, 08:26 PM
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#84
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Member Group: Members Posts: 408 Joined: 18-September 17 Member No.: 8250 |
Approachable explanation of estimation of Europa ocean/ice-crust found in UCSC lecture slides titled:
EART162: PLANETARY INTERIORS |
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Oct 22 2022, 01:09 AM
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#85
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IMG to PNG GOD Group: Moderator Posts: 2250 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
This is an animation of the Europa flyby. It shows the true speed of the flyby, i.e. it's not been speeded up as these animations usually are:
https://vimeo.com/762819526 The latter half of the above animation is very slow. In this version the speed of everything has been increased by a factor of 3: https://vimeo.com/762820642 |
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Oct 29 2022, 05:06 AM
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#86
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Member Group: Members Posts: 362 Joined: 13-April 06 From: Malta Member No.: 741 |
When are radar studies from Europa flyby expected?
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Oct 29 2022, 05:45 AM
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#87
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Member Group: Members Posts: 232 Joined: 14-January 22 Member No.: 9140 |
Papers about Juno's microwave observations of Ganymede came out 6 and 9 months after the observations were made, so perhaps that timeframe will be similar for Europa.
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Oct 31 2022, 12:53 AM
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#88
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Member Group: Members Posts: 706 Joined: 22-April 05 Member No.: 351 |
Papers about Juno's microwave observations of Ganymede came out 6 and 9 months after the observations were made, so perhaps that timeframe will be similar for Europa. Early Juno Europa results will be presented at the AGU conference in December. I expect to be there and will try to do a summary. -------------------- |
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Mar 9 2023, 03:02 PM
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#89
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Member Group: Members Posts: 349 Joined: 20-June 07 From: Slovenia Member No.: 2461 |
This is a mosaic of all four JunoCam images rendered from Juno's location when image PJ45_4 was obtained. The image is enlarged by a factor of 2 relative to the size of image PJ45_4. North is up. This image actually substantially improves the map coverage along longitude 35°E (325°W in IAU terms). |
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Dec 30 2023, 09:20 AM
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#90
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Member Group: Members Posts: 315 Joined: 1-October 06 Member No.: 1206 |
Very interesting open access paper in JGR Planets regarding the J45 Europa flyby
as seen by the Stellar Reference Unit in Jupitershine: https://agupubs.onlinelibrary.wiley.com/doi...29/2023JE008105 P |
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