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Juno Perijove 36
Brian Swift
post Sep 4 2021, 08:05 AM
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PJ36 data showed up about 1:14 pm.

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16-bit PNG version at at https://www.missionjuno.swri.edu/junocam/processing?id=11285
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Brian Swift
post Sep 8 2021, 07:56 PM
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PJ36_43 full spin Jupiter and Io (with poor color alignment) image.
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full resolution at https://www.missionjuno.swri.edu/junocam/processing?id=11342

Mike, so really no way to get 84 frames from a full spin image?
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mcaplinger
post Sep 8 2021, 09:44 PM
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QUOTE (Brian Swift @ Sep 8 2021, 12:56 PM) *
Mike, so really no way to get 84 frames from a full spin image?

Sure, it's easy. We only do it this way to irritate you personally. rolleyes.gif


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Brian Swift
post Sep 8 2021, 10:48 PM
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QUOTE (mcaplinger @ Sep 8 2021, 02:44 PM) *
Sure, it's easy. We only do it this way to irritate you personally. rolleyes.gif

I knew there would be a reasonable explanation. laugh.gif
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mcaplinger
post Sep 9 2021, 12:20 AM
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QUOTE (Brian Swift @ Sep 8 2021, 12:56 PM) *
Mike, so really no way to get 84 frames from a full spin image?

Seriously, it's not trivial because of some timing limitations. We only took this image for Io, though I question if there was much point given the range. It does seem like Murphy's law always splits the image across the planet, we've had that problem since Earth flyby. Maybe there is some systematics in the spin phase we have never learned about.


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volcanopele
post Sep 9 2021, 03:29 PM
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I guess there is always the off chance you might catch a plume. Looking at the geometry, Chalybes is at the limb, but even if it were active, plumes on the limb are just about at the limit of JunoCAM's capabilities at this distance (346,000 km). Plumes JUST past the terminator are JunoCAM's best bet but there just weren't any good sources during this opportunity.


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Bjorn Jonsson
post Sep 11 2021, 02:43 PM
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This is processed from image PJ36_40, approximately true color/contrast and enhanced versions. North is to the left.

Attached Image
Attached Image


Apparently the images continue to get slightly redder. For PJ36 I am correcting the color by multiplying R/G/B with 1.0, 1.285 and 3.12 whereas for PJ35 I ended up using 1.0, 1.27 and 3.08.
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climber
post Sep 15 2021, 05:17 PM
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Don’t know where to post this but sew 2 days ago the info. For exemple here :https://www.forbes.com/sites/ericmack/2021/09/14/jupiter-seems-to-have-just-been-smacked-by-something-pretty-big/?sh=7ff452ce2edf
So a hit occurred on Sept 13th and wondering if Juno could get a glimpse of remanant traces…


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mcaplinger
post Sep 15 2021, 06:08 PM
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QUOTE (climber @ Sep 15 2021, 09:17 AM) *
So a hit occurred on Sept 13th and wondering if Juno could get a glimpse of remanant traces…

I haven't seen anything about this from a better source than Forbes, anyone else?

Juno is really too far from Jupiter now to get useful data, so it won't be until the next pass on 16 October. Not sure if that longitude will be well seen.


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volcanopele
post Sep 15 2021, 06:15 PM
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From Sky and Telescope:

https://skyandtelescope.org/astronomy-news/...ash-at-jupiter/

Article has information about the location of the impact:

"Pereira captured the flash at latitude –5.5° and longitude 105.7° (System I / L1), 83.3° (System II / L2), and 273.4° (System III / L3)"


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mcaplinger
post Sep 15 2021, 06:57 PM
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QUOTE (volcanopele @ Sep 15 2021, 10:15 AM) *
"Pereira captured the flash at latitude –5.5° and longitude 105.7° (System I / L1), 83.3° (System II / L2), and 273.4° (System III / L3)"

Here's the Cosmographia view for the next PJ, but I'm not sure what longitude system it displays, and the whole E/W thing versus what S&T reports...
Attached Image


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JRehling
post Sep 15 2021, 09:49 PM
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Here's a thread on CloudyNights about it:

https://www.cloudynights.com/topic/789064-c...act-on-jupiter/

Damian Peach obtained a really nice ground-based image hours later that showed no sign of the impact.

https://twitter.com/peachastro/status/1437834143350628358
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mcaplinger
post Sep 16 2021, 04:45 PM
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QUOTE (mcaplinger @ Sep 15 2021, 11:57 AM) *
I'm not sure what longitude system it displays, and the whole E/W thing versus what S&T reports...

If I assume that all the numbers from S&T are degrees west (which seems to be the standard amateur convention, very reasonable) and Cosmographia is displaying System III longitudes (which is the standard NAIF convention, I believe) then the next PJ will be on the opposite side of the planet from this event, unfortunately.


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Bill Harris
post Sep 17 2021, 04:59 PM
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Although the next Perijove will be on the other side from this impact point, i wonder if a disturbance could not drift along the Zone over the next Earth month (and many Jovian days) and be seen at that Perijove.
We'll see what we see in October.

--Bill


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JRehling
post Sep 17 2021, 05:26 PM
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I suppose the problem is that we also would have to recognize the disturbance against the locally chaotic clouds, and we already know that the Damian Peach image showed nothing at that resolution. Obviously, Juno offers much better resolution, but now we know that whatever we might be looking for is going to be pretty subtle and also of unknown specific appearance.

This is a little like someone telling you they lost something on the beach and you're looking for it without knowing what it is. Even if you find something, what you find might not be it.
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