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Juno Perijove 21, July 21, 2019
Brian Swift
post Jul 23 2019, 11:28 PM
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Collage of PJ21 initial downlink images. Full rez 13902x9218 8-bit JPG available on flickr. 16-bit PNG uploaded to missionjuno.
Junocam PJ21 Preliminary Download Collage
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Brian Swift
post Jul 23 2019, 11:41 PM
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Mike, is there an explanation for the occasional missing frame seen at the beginning of some of the "wide" (~180 spin) raw images?
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Kevin Gill
post Jul 24 2019, 01:56 AM
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A couple of angry looking storms visible


Jupiter - PJ21-17 - Detail



Jupiter - PJ21-18 - Detail



Jupiter - PJ21-19 - Detail
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mcaplinger
post Jul 24 2019, 03:58 AM
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QUOTE (Brian Swift @ Jul 23 2019, 03:41 PM) *
Mike, is there an explanation for the occasional missing frame seen at the beginning of some of the "wide" (~180 spin) raw images?

Looks to me like our ground data system didn't command quite enough frames to catch the top limb of the planet in the red channel -- maybe it incorrectly assumes there can't be more than 40 frames in a nadir-centered image, which due to roundoff is not quite true. I'll take a look at it.


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Bjorn Jonsson
post Jul 24 2019, 11:34 PM
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This is a preliminary map-projected version of image PJ21_26. The Great Red Spot in on the limb in the original raw image, therefore a part of it is 'missing' here and Jupiter's sky is visible with huge vertical exaggeration. Approximately true color/contrast.

Attached Image
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mcaplinger
post Jul 25 2019, 12:58 AM
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Be patient, the GRS views get better. We're still having some data dropout problems, I'd expect another push of images tomorrow.


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mcaplinger
post Jul 25 2019, 08:26 PM
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Nearly all of the PJ21 images are on missionjuno now -- one image is still partial AFAIK.


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Kevin Gill
post Jul 25 2019, 10:01 PM
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Ah, Juno got nice view of the Great Red Spot. Some preliminary processing of it:


Jupiter - PJ21-36



Jupiter - PJ21-32/36/39/40
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Kevin Gill
post Jul 26 2019, 02:41 AM
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A couple composite views:

JNCE_2019202_21C00010_V01
JNCE_2019202_21C00012_V01
JNCE_2019202_21C00013_V01
JNCE_2019202_21C00014_V01
JNCE_2019202_21C00015_V01:


Jupiter - Perijove 21 - Composite


JNCE_2019202_21C00015_V01
JNCE_2019202_21C00017_V01:


Jupiter - PJ21-15/17


JNCE_2019202_21C00014_V01
JNCE_2019202_21C00015_V01
JNCE_2019202_21C00017_V01
JNCE_2019202_21C00018_V01
JNCE_2019202_21C00019_V01:


Perijove 21 - Composite


JNCE_2019202_21C00032_V01
JNCE_2019202_21C00036_V01
JNCE_2019202_21C00039_V01
JNCE_2019202_21C00040_V01
JNCE_2019202_21C00041_V01
JNCE_2019202_21C00042_V01
JNCE_2019202_21C00043_V01
JNCE_2019202_21C00044_V01
JNCE_2019202_21C00045_V01:


Jupiter - Perijove 21
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Sean
post Jul 26 2019, 02:23 PM
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PJ21_16 [GE/SD]






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mcaplinger
post Jul 26 2019, 05:57 PM
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QUOTE (Kevin Gill @ Jul 25 2019, 02:01 PM) *
Ah, Juno got nice view of the Great Red Spot. Some preliminary processing of it...

Beautiful work as always, Kevin. Interesting to compare this to what Damien Peach saw back in June -- http://damianpeach.com/jup19/2019-06-03-0500_3-RGBdp.jpg -- doesn't look all that different except that scalloped stuff to the east seems to have smoothed out.


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Kevin Gill
post Jul 26 2019, 07:29 PM
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QUOTE (mcaplinger @ Jul 26 2019, 01:57 PM) *
Beautiful work as always, Kevin. Interesting to compare this to what Damien Peach saw back in June -- http://damianpeach.com/jup19/2019-06-03-0500_3-RGBdp.jpg -- doesn't look all that different except that scalloped stuff to the east seems to have smoothed out.



Well, it's interesting... In not-very-scientific measurements from Perijoves 7, 12, 18, & 21, there appears to be a measurable longitudinal shrinking of the GRS:


Perijove 7: 16,094 km
Attached Image



Perijove 12: 15,898 km
Attached Image



Perijove 18: 15,627 km
Attached Image



Perijove 21: 15,149 km
Attached Image



Attached Image

With a linear decline in width up to Perijove 18, then a sharper decline to Perijove 21 which matches the timing of the detachments observed by Damien Peach.
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Bjorn Jonsson
post Jul 26 2019, 11:27 PM
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QUOTE (mcaplinger @ Jul 25 2019, 08:26 PM) *
Nearly all of the PJ21 images are on missionjuno now -- one image is still partial AFAIK.

I noticed that there is no image number 33 at the MissionJuno website. Is that the one that is still partial? If there is an image number 33 that's actually probably a very interesting image that should show areas north and/or west of the GRS very well.

QUOTE (Kevin Gill @ Jul 26 2019, 07:29 PM) *
With a linear decline in width up to Perijove 18, then a sharper decline to Perijove 21 which matches the timing of the detachments observed by Damien Peach.

Something comparable has also been measured from ground based images, see http://alpo-j.asahikawa-med.ac.jp/kk19/j190624r.htm and http://pianeti.uai.it/index.php/Jupiter:_2019_Animated_gif
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mcaplinger
post Jul 27 2019, 04:13 PM
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QUOTE (Bjorn Jonsson @ Jul 26 2019, 03:27 PM) *
I noticed that there is no image number 33 at the MissionJuno website. Is that the one that is still partial? If there is an image number 33 that's actually probably a very interesting image that should show areas north and/or west of the GRS very well.

Correct. Image 33 taken 04:32:27. The dropout is small but goes right across the GRS in one channel (of course.) I'd expect it to be pushed by mid-week next week one way or another.


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mcaplinger
post Jul 29 2019, 08:09 PM
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QUOTE (mcaplinger @ Jul 27 2019, 08:13 AM) *
I'd expect it to be pushed by mid-week next week one way or another.

The last image from PJ21 is on missionjuno now.


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