Juno perijove 7: GRS images, July 11, 2017 |
Juno perijove 7: GRS images, July 11, 2017 |
Jul 19 2017, 01:02 PM
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#91
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
This article of John Rogers (BAA) contains an animated GIF derived from the four close-up PJ07 GRS images. The images of the GIF are reprojected from the raws to the same position on the spacecraft trajectory, and manually corrected for most of the residual geometrical inaccuracies.
It shows a global acyclonic rotation of the GRS. Extracting residual parallax for 3D images in an unambiguous way is pretty hard, and I'm unaware of any successful attempt. Using these images as L/R images of an anaglyph would visualize true motion of features between images as a 3D impression. Being aware of this effect could help to identify subtle differential motion within the GRS. |
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Jul 30 2017, 02:30 PM
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#92
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Member Group: Members Posts: 923 Joined: 10-November 15 Member No.: 7837 |
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Jul 30 2017, 05:09 PM
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#93
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Member Group: Members Posts: 963 Joined: 15-June 09 From: Lisbon, Portugal Member No.: 4824 |
This article of John Rogers (BAA) contains an animated GIF Am I seing two moons (images 2 and 3) crossing from left to right? |
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Jul 30 2017, 10:51 PM
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#94
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
That's most likely energetic particle hits. Most repetitive camera artifacts are filtered out. Lighnings are possible, but unlikely. Moons would probably look differently, less sharp, and probably moving diagonally due to the rapidly changing perspective. They would probably be displaced between camera color filters, showing up as three dots in a row in different colors within one image. Note, that we are rather close to Jupiter during the flyby, just a fraction of the Roche limit. Moons that close to Jupiter would be very unusual, however not entirely impossible.
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Jul 31 2017, 05:03 PM
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#95
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Member Group: Members Posts: 963 Joined: 15-June 09 From: Lisbon, Portugal Member No.: 4824 |
Many thanks for your information-packed reply, Gerald.
I went searching for the Roche limit and the Wikipedia article added a lot to what I remembered. If I understood correctly, the limit for a rigid body is about 900km (PJ7 was at 3500km). Anyway WIBN if those were moons ar a broken comet/asteroid taking a final plunge... Cheers Fernando |
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Jul 31 2017, 09:50 PM
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#96
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
The Roche limit for a rigid spherical body is about 1.26 times the radius of the primary body, multiplied by a factor derived from the density quotient. With Jupiter's radius of about 70,000 km, we get a Roche limit of 70,000 km x 0.26 = 18,000 km altitude. This applies to rigid bodies of a density of about 1.3 g/cm³ like Jupiter's mean density. An iron asteroid could probably plunge into Jupiter's atmosphere without prior break-up due to its high density compared to Jupiter.
The images of the GRS have been taken from altitudes between 6200 km (#59), and 16,500 km (#62). Small bodies of sufficient shear and tensile strength may survive well within their formal Roche limit, too. Impacts of small bodies into Jupiter's atmosphere have been observed. Hence unlikely, but not ruled out to observe such an event. The latest such observed impacts have been observed in March 2016, and in May 2017. |
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Jul 31 2017, 10:14 PM
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#97
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Member Group: Members Posts: 963 Joined: 15-June 09 From: Lisbon, Portugal Member No.: 4824 |
Thanks again Gerald.
The article was the one you point out but I misunderstood the tables... Oh well, back to the homework |
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Aug 1 2017, 12:03 AM
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#98
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Member Group: Members Posts: 923 Joined: 10-November 15 Member No.: 7837 |
I had another stab at Gerald's PJ07_062...
Here are some 4k images cropped from the portrait... Upscaled, processed & extended -------------------- |
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Aug 2 2017, 10:52 PM
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#99
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
Here the result of some recreation with PJ07, #053:
It shows Jupiters NN-LRS-1, NN for north-north, LRS for "Little Red Spot". This version is reprojected to about one and a half minutes after the original image time, in order to bring the storm closer to nadir. Then, I've enhanced the image with a sequence of several methods, first an automated heuristics which adjusts for some of the illumination and light scattering effects followed by gamma stretch to the 4th power of radiometric values, then some arbitrary white-balancing, non-linear brightness-stretch, some saturation enhancement, sharpening, point-noise filtering, masking to a disc. |
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Aug 26 2017, 01:39 PM
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#100
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Newbie Group: Members Posts: 7 Joined: 12-July 17 Member No.: 8200 |
Here the result of some recreation with PJ07, #053: It shows Jupiters NN-LRS-1, NN for north-north, LRS for "Little Red Spot". This version is reprojected to about one and a half minutes after the original image time, in order to bring the storm closer to nadir. Then, I've enhanced the image with a sequence of several methods, first an automated heuristics which adjusts for some of the illumination and light scattering effects followed by gamma stretch to the 4th power of radiometric values, then some arbitrary white-balancing, non-linear brightness-stretch, some saturation enhancement, sharpening, point-noise filtering, masking to a disc. Hi Sir, your work on raw images is trully awesome, without you we have nothing. You did this for perijove 6 : http://junocam.pictures/gerald/uploads/20170607/ Did you make the same for perijove 7 ? I need this to watch something at the terminator and your images has more range than ones processed by others, so it's easier. On my twitter profile you can see some other examples : https://twitter.com/JohannGuillon Thank you for your work, really. Johann |
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Aug 26 2017, 07:00 PM
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#101
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
Thus far, I've rendered draft thumbnails only for the approach sequence. They aren't quite perfect regarding RGB alignment, since I didn't run a specific calibration.
Most interesting regarding the haze structures is probably #51. Here an enhanced crop: I'll see, whether I'll be able to render the departure sequence in a similar draft mode. In that case, I'll add another post in a few hours, |
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Aug 26 2017, 10:51 PM
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#102
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Newbie Group: Members Posts: 7 Joined: 12-July 17 Member No.: 8200 |
Thus far, I've rendered draft thumbnails only for the approach sequence. They aren't quite perfect regarding RGB alignment, since I didn't run a specific calibration. Most interesting regarding the haze structures is probably #51. Here an enhanced crop: I'll see, whether I'll be able to render the departure sequence in a similar draft mode. In that case, I'll add another post in a few hours, So it's haze ! What a planet ! Thank you Gerald ! |
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Aug 27 2017, 03:38 AM
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#103
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
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Aug 29 2017, 11:52 PM
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#104
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Newbie Group: Members Posts: 7 Joined: 12-July 17 Member No.: 8200 |
Again thank you for your work Gerald. Have a great day |
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Sep 2 2017, 12:34 PM
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#105
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IMG to PNG GOD Group: Moderator Posts: 2254 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
Below are five images processed from PJ07_53. There are three approximately true color/contrast images followed by two images where the contrast, colors and sharpness have been enhanced. There is one 'exception' though. In the first image (a true color/contrast image), the brightness near the terminator has been increased a bit to show various dimly lit features more clearly.
A subset of the metadata: IMAGE_TIME = 2017-07-11T01:42:08.663 MISSION_PHASE_NAME = PERIJOVE 7 PRODUCT_ID = JNCE_2017192_07C00053_V01 SPACECRAFT_ALTITUDE = 11444.6 km SPACECRAFT_NAME = JUNO SUB_SPACECRAFT_LATITUDE = 44.5048 SUB_SPACECRAFT_LONGITUDE = 40.2871 TITLE = POI: Juno eye Resolution at nadir: ~7.7 km/pixel |
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