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Charon shine on pluto's farside, is there any charon shine on pluto?
TrappistPlanets
post May 15 2021, 01:04 PM
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i wandered about charonshine on pluto and
i watched this animation of the flyby and according to it there should be
a good chunk of charonshine on the farside lighting up mapped parts and unmapped parts of the southern hemisphere
in this image https://upload.wikimedia.org/wikipedia/comm...cklit_Pluto.jpg


here is a pic from the animation showing potential charonshine on pluto
Attached Image




can anyone like ted pull real charonshine from any of the pluto images, because theoretically there was a huge hunk of it visible during the flyby and i want to add it to known map coverage

here is a whole gallery of raw pluto images for anyone to attempt charonshine extraction
http://pluto.jhuapl.edu/soc/Pluto-Encounte...Date&page=9
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fredk
post May 15 2021, 02:13 PM
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There was lots of discussion of Charonshine in the post-encounter threads - check out these for example:

http://www.unmannedspaceflight.com/index.php?showtopic=8074
http://www.unmannedspaceflight.com/index.php?showtopic=8071
http://www.unmannedspaceflight.com/index.php?showtopic=8103
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TrappistPlanets
post May 16 2021, 12:52 PM
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QUOTE (fredk @ May 15 2021, 03:13 PM) *

yes there is charonshine on pluto conversations in there but i don't see what i am looking for (a good image of charonshine on pluto i can reproject into a map

--edit---

i did find a really nice charon night being lit by plutoshine image and i reprojected it into a map and merged it with the charon map on the usgs astropedia
the usgs map i used can be found here https://astrogeology.usgs.gov/search/map/Ch...ic_300m_Jul2017
you can easily find lots of images of charon's night being lit by plutoshine by simply searching "charon's night"

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TrappistPlanets
post Oct 26 2021, 11:03 AM
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a new paper about pluto's night side and charonshine was published
https://arxiv.org/pdf/2110.11976.pdf
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Antdoghalo
post Nov 18 2021, 04:42 AM
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A closer look at the map projected images of that paper reveal around 4 fractures of the anti-encounter side "Reindeer Antlers" extending into the southern hemisphere as I thought would be the case as well as two features between them I can certainly say are craters, one with a central peak around 45 South 330 East. There are several other crater-like circular features and linear ones but these could just be noise artifacts as they do not stand out as much as those mentioned above. The best way I could compare this analysis is when Phil Stooke had to pick out features on blurry images of Puck, Larissa, and Proteus.


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TrappistPlanets
post Nov 18 2021, 09:47 PM
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QUOTE (Antdoghalo @ Nov 18 2021, 04:42 AM) *
A closer look at the map projected images of that paper reveal around 4 fractures of the anti-encounter side "Reindeer Antlers" extending into the southern hemisphere as I thought would be the case as well as two features between them I can certainly say are craters, one with a central peak around 45 South 330 East. There are several other crater-like circular features and linear ones but these could just be noise artifacts as they do not stand out as much as those mentioned above. The best way I could compare this analysis is when Phil Stooke had to pick out features on blurry images of Puck, Larissa, and Proteus.

uhmm..it would be a good idea to post a pic so the experts can have a look and see if its just noise or if your on to something

that Sputnik impact (formed the heart) must have been very powerful to cause the other side to crack and buckle that much, how didn't pluto blow up into tons of pieces by the force/power of this near head on(?) collision?


looks like the terrain cracked around the heart (creating cracks around the heart, and lots of buckled terrain) (i looked at pluto's DEM)
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Phil Stooke
post Nov 18 2021, 10:11 PM
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"how didn't pluto blow up into tons of pieces"

An impact crater forms as an expanding shock from the impact excavates a transient cavity, which becomes the crater after other modifications (gravity, ejecta fallback etc). For a body to be blown apart the entire body has to be within that transient cavity. No observed impact crater from Stickney on Phobos to SPA on the Moon or Sputnik on Pluto comes close to that. If you can see a crater it was nowhere near blowing the object apart.

Also, the drawings of Pluto are by James Tuttle Keane.

Phil


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TrappistPlanets
post Nov 19 2021, 12:12 PM
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QUOTE (Phil Stooke @ Nov 18 2021, 10:11 PM) *
"how didn't pluto blow up into tons of pieces"

An impact crater forms as an expanding shock from the impact excavates a transient cavity, which becomes the crater after other modifications (gravity, ejecta fallback etc). For a body to be blown apart the entire body has to be within that transient cavity. No observed impact crater from Stickney on Phobos to SPA on the Moon or Sputnik on Pluto comes close to that. If you can see a crater it was nowhere near blowing the object apart.

Also, the drawings of Pluto are by James Tuttle Keane.

Phil


James Tuttle Keane did a nice job at rendering the formation of sputnik


so the impacter needs to be really really huge (almost the same size as pluto) and moving fast to destroy pluto
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