Juno Perijove 57, December 30, 2023 |
Juno Perijove 57, December 30, 2023 |
Dec 31 2023, 04:31 AM
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#31
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Senior Member Group: Moderator Posts: 3242 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
I haven't gotten that far yet but my best guess at this point would be Xihe.
-------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Dec 31 2023, 05:03 AM
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#32
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Senior Member Group: Moderator Posts: 3242 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
My new favorite volcano is visible in Jupiter Shine!!!!!
this is Tonatiuh, a 500-km long lava flow that wasn't there 15 years ago, at all. This is also the site of that plume that JunoCam saw at the end of 2018. -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Dec 31 2023, 06:17 AM
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#33
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Senior Member Group: Moderator Posts: 3242 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
-------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Dec 31 2023, 06:27 AM
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#34
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Absolutely spectacular stuff, well worth the wait. Congrats to the team for pulling it off.
-------------------- |
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Dec 31 2023, 08:51 AM
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#35
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Member Group: Members Posts: 219 Joined: 14-November 11 From: Washington, DC Member No.: 6237 |
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Dec 31 2023, 09:01 AM
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#36
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IMG to PNG GOD Group: Moderator Posts: 2254 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
Congratulations to the Juno team. The high quality of these images compared to PJ56 is a nice surprise to me. Even the blue images have clear details on the nightside.
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Dec 31 2023, 09:14 AM
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#37
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Newbie Group: Members Posts: 12 Joined: 15-August 12 Member No.: 6562 |
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Dec 31 2023, 02:48 PM
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#38
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Member Group: Members Posts: 706 Joined: 3-December 04 From: Boulder, Colorado, USA Member No.: 117 |
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Dec 31 2023, 03:29 PM
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#39
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Member Group: Members Posts: 100 Joined: 30-November 05 From: Antibes, France Member No.: 594 |
A captivating time in the Juno mission around Jupiter !
Regarding the mountains or volcanoes of Io, there is a remarkable shadow of a mountain or volcano in a high-resolution view of Io during that flyby. I think we can approximate the potential height of the mountain. I took one of the images presented by Jason to evaluate the size of the topographic structure and to evaluate the potential height of the mountain or volcano. I assume a diameter of around 1302 pixels for the disk of Io (real diameter of 3643.2 km). From the peak of the mountain to the limit of the shadow, there is a distance of around 56 pixels (From location A to B, there is a distance of 56 pixels). That distance of 56 pixels must represent aroud 157 km (56 pixels /1302 pixels * 3643.2 km). If we have the angle of the Sun above the horizon from location B (location of the limit of the shadow related to the peak of the mountain), we should be in a position to approximate the potential height of that mountain that may be closer, in appearance, to "Mont Cervin" (The Matterhorn) in Switzerland than "Le Piton de la Fournaise" (Peak of the Furnace) in the island of "La Réunion" ! |
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Dec 31 2023, 04:42 PM
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#40
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Senior Member Group: Members Posts: 4256 Joined: 17-January 05 Member No.: 152 |
There is enough information in the image itself to determine the angular height of the sun at that peak, based on the position of the terminator. But the peak is pretty close to the terminator so the angle is quite low and will exagerate the relief considerably.
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Dec 31 2023, 05:35 PM
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#41
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Senior Member Group: Members Posts: 2542 Joined: 13-September 05 Member No.: 497 |
Has the camera performance actually improved since PJ56? It looks like it. Yes, certainly. Buried in the Facebook comments from NASA Solar System Exploration: QUOTE After Juno's last close pass by Jupiter in November, JunoCam's performance was severely degraded by radiation damage. Using its built-in heater, the camera was warmed to a temperature of about 65C (150F) for several weeks in December, a process called "annealing", and this treatment has restored camera function, at least for this pass. Credit to Jamie Carter at Forbes.com for actually finding that comment and reporting it. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Dec 31 2023, 05:37 PM
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#42
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IMG to PNG GOD Group: Moderator Posts: 2254 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
Has the camera performance actually improved since PJ56? It looks like it. Yes, definitely a very large improvement since PJ56. The image quality is now probably comparable to PJ55. This is a preliminary version of image PJ57_22: North is up. The brightness of the nightside has been increased to show details there. |
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Dec 31 2023, 05:40 PM
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#43
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Member Group: Members Posts: 251 Joined: 14-January 22 Member No.: 9140 |
Congratulations to Juno team! There seems to be some "visible" changes at Loki compared to Voyager 1 images! There's some detail around Loki in the color that implies changes, too, although to be absolutely certain we'd have to check against differences in filters. |
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Dec 31 2023, 05:47 PM
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#44
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Member Group: Members Posts: 251 Joined: 14-January 22 Member No.: 9140 |
At the hazard of gushing too much for board rules, this is just amazing stuff, way better than expected. Amazing work by the team and the citizen imagery mavens. I notice that the good stuff came out much sooner after the flyby than with P55; I was ready to chew my fingernails waiting a little longer.
Add this to the long list of tremendous opportunistic science where a mission funded for one purpose wonderfully observed another target. The Ganymede and Europa observations were very nice but this is astonishing. I look forward to learning what the radio science tells us about Io's innards. |
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Dec 31 2023, 06:47 PM
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#45
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Senior Member Group: Members Posts: 1669 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
A very rough / preliminary idea of how one of volcanopele's images fits in a cylindrical map (before and after)
-------------------- Steve [ my home page and planetary maps page ]
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