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Juno perijove 7: GRS images, July 11, 2017
Gerald
post Jun 30 2017, 12:38 PM
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There are another three days left over to vote for Perijove-07 points of interest (POI).

This time, all eyes will be on the Great Red Spot (GRS). Provided everything works as scheduled, one RGB image will be made almost above the center of the GRS. I'd think, that this RGB image will be complemented by a methane image. Since this time, we won't have contact with Earth during the flyby, the amount of data to be collected is rather constraint. Therefore, only a small number of images of the polar region is scheduled, just enough for a long-term observation. Storage will be sufficient for imaging several POIs to be voted for, but we may not get a full latitudinal coverage.
In order to obtain a full latitudinal coverage of the GRS and adjacent regions, we should take at least one image near the northern and one image near the southern edge of the GRS, better a set of five RGB images. We would see the GRS from different angles, and we would be able to study the turbulence north and south of the GRS. I'd also expect, that only images from north and south of the GRS will be able to cover most of its longitudinal extent.
In addition, a sequence of images near the GRS would provide the raw material for a great and unprecedented fly-over movie.

That said, there are several other interesting or potentially interesting targets to consider. Besides for an adjacent region of the GRS, I voted for the two polar-most POIs, since I hope, that we'll get some additional polar and subpolar images for a long-term study, and more close-ups of those incredibly turbulent FFR zones near the poles.
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PhilipTerryGraha...
post Jul 1 2017, 01:55 PM
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Presenting, the fancy commemorative logo I made for the subreddit! biggrin.gif


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Candy Hansen
post Jul 6 2017, 06:58 PM
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We have scheduled 3 GRS images - one that will capture the northern edge, one centered as Juno is right over the GRS, and one looking from the south. The third one will include the methane filter.

As you might imagine the project and the media are very interested in seeing these image products as soon as possible! We can't really predict exactly when they will be downlinked, but I will jump on here to let you know when they have hit the earth and are in the pipeline. This is the message I got from Scott Bolton, the PI: "I am hoping Candy can reach out to a few amateur colleagues to get them prepped to work fast. The reward will be the first to post a quality image will get the credit from NASA and I've suggested that NASA reach out for a quote from the person processing the image to inquire how it felt to the first human to see the GRS up close.".
So I know you all will process the images just because that is your passion, but there will also be intense interest from the project to release your beautiful products and, if you are interested, to interview you.

FYI, I love showing off the products you post on the missionjuno website! smile.gif
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nprev
post Jul 7 2017, 01:14 AM
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All right, all you image wizards...here's a personal invite from a real live space mission to astonish a worldwide audience!!! Looking forward to seeing the results!

Thank you for this, Candy; we at UMSF are honored! smile.gif


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Candy Hansen
post Jul 7 2017, 04:39 PM
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I am such a newbie I started a new topic, when I intended to put this under the PJ7 thread. I've asked one of the moderators if it can be moved. Sorry!
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Roman Tkachenko
post Jul 7 2017, 10:50 PM
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Can't wait for new images!
While we wait for new image I just put here this picture.

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t_oner
post Jul 9 2017, 02:38 PM
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Would we have a GRS floyover with the original orbit? If so when?
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Sean
post Jul 10 2017, 02:57 PM
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Using Bjorn's Voyager mosaic for this comp...


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Candy Hansen
post Jul 10 2017, 05:37 PM
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I've been asked this a lot...
When will the GRS images be downlinked? These are the factors:

* We have no downlink during the perijove pass because the spacecraft is in the MWR attitude. This means that all data must be stored on-board. The JunoCam onboard storage is 1181 Mb.
* Once downlink starts we play back engineering first, then FGM, then the other instruments
* The instrument round-robin will start at 6:40 am on Tuesday; JunoCam gets roughly 6 min per hour
* We start by playing back the images collected at -24 hr. Those images are compressed, so it is difficult to calculate the speed of playback precisely. Also, if other instruments’ buffers empty early then playback of JunoCam data will speed up.
* If the GRS images happen to be played back in the middle of the night there is no one at MSSS to see that they’ve arrived - that will happen at open of business
* Once we get the actual images we still need the c kernel with the spacecraft attitude to run the processing pipeline. Usually the C kernel arrives within a day of perijove, so this shouldn’t be a delay.
* As soon as the raw images are posted we will let everyone know that they are available at missionjuno.

Very conservatively I've estimated July 14, expecting that it is likely we'll see them at least a day before.
Hope this is helpful!!
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mcaplinger
post Jul 10 2017, 06:55 PM
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QUOTE (Candy Hansen @ Jul 10 2017, 09:37 AM) *
* The instrument round-robin will start at 6:40 am on Tuesday...

Pacific Daylight Time (UT-7h) I presume. You can look at https://eyes.nasa.gov/dsn/dsn.html to see when Juno is being tracked; we have to be on a 70m antenna to get a decent downlink rate.


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Roman Tkachenko
post Jul 10 2017, 07:15 PM
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Thanks a lot for the information!


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Explorer1
post Jul 11 2017, 03:36 AM
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DSN shows Juno talking to Earth (only a carrier wave for now).
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mcaplinger
post Jul 11 2017, 04:22 AM
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QUOTE (t_oner @ Jul 9 2017, 06:38 AM) *
Would we have a GRS flyover with the original orbit? If so when?

It's a mission goal to do this at least once. Since neither the long-term position of the GRS or the exact orbit parameters can be predicted exactly, there's no way to know when in the original mission plan it would have happened.


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PhilipTerryGraha...
post Jul 11 2017, 04:37 AM
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QUOTE (mcaplinger @ Jul 11 2017, 02:22 PM) *
It's a mission goal to do this at least once. Since neither the long-term position of the GRS or the exact orbit parameters can be predicted exactly, there's no way to know when in the original mission plan it would have happened.


I guess all that's important now that it happened smile.gif


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Gerald
post Jul 11 2017, 05:05 AM
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QUOTE (Explorer1 @ Jul 11 2017, 05:36 AM) *
DSN shows Juno talking to Earth (only a carrier wave for now).

The predicted SPICE kernels look as if a change of s/c attitude has been anticipated for 08:13 UTC, i.e. in a few hours. That's my best guess, when downlink will start.
I also presume, that c-kernel data of today will miss the GRS flyby by about two hours, such that my best guess for the availability of the first raws will be tomorrow (2017-07-12) morning PDT.
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