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Juno Perijove 48, January 22, 2023
mcaplinger
post Jan 28 2023, 04:48 PM
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https://www.nasa.gov/feature/jpl/nasa-s-jun...lyby-of-jupiter

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The JunoCam imager aboard NASA’s Juno spacecraft did not acquire all planned images during the orbiter’s most recent flyby of Jupiter on Jan. 22. Data received from the spacecraft indicates that the camera experienced an issue similar to one that occurred on its previous close pass of the gas giant last month, when the team saw an anomalous temperature rise after the camera was powered on in preparation for the flyby.

However, on this new occasion the issue persisted for a longer period of time (23 hours compared to 36 minutes during the December close pass), leaving the first 214 JunoCam images planned for the flyby unusable. As with the previous occurrence, once the anomaly that caused the temperature rise cleared, the camera returned to normal operation and the remaining 44 images were of good quality and usable.


The good images have been posted to missionjuno.


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Disclaimer: This post is based on public information only. Any opinions are my own.
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Bjorn Jonsson
post Feb 11 2023, 11:51 PM
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I should mention that interestingly, I have found that if I use any of the most recent clock kernels (JNO_SCLKSCET.00144.tsc, 143 or 142) I get very large pointing (or timing?) errors, typically ~230 (!) pixels in the vertical direction in the images. I have to use JNO_SCLKSCET.00141.tsc to get normal results. I find this interesting because JNO_SCLKSCET.00141 predates PJ48. In fact JNO_SCLKSCET.00142 and 143 also predate PJ48.

The same is true for PJ47, I get large errors unless I use JNO_SCLKSCET.00141.tsc (I suspect 140 would also work). JNO_SCLKSCET.00141.tsc predates not only PJ48, it also predates PJ47.
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Brian Swift
post Feb 17 2023, 06:58 AM
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QUOTE (Bjorn Jonsson @ Feb 11 2023, 03:51 PM) *
I should mention that interestingly, I have found that if I use any of the most recent clock kernels (JNO_SCLKSCET.00144.tsc, 143 or 142) I get very large pointing (or timing?) errors, typically ~230 (!) pixels in the vertical direction in the images. I have to use JNO_SCLKSCET.00141.tsc to get normal results. I find this interesting because JNO_SCLKSCET.00141 predates PJ48. In fact JNO_SCLKSCET.00142 and 143 also predate PJ48.

The same is true for PJ47, I get large errors unless I use JNO_SCLKSCET.00141.tsc (I suspect 140 would also work). JNO_SCLKSCET.00141.tsc predates not only PJ48, it also predates PJ47.

Thanks. Investigating this made me realize I'd processed PJ48 using the PJ47 SPK predict.
After reprocessing PJ48 using today's juno_pred_orbit.bsp and JNO_SCLKSCET.00145.tsc,
the largest offsets I'm seeing are ~9 pixels. But even using PJ47 predict and 144.tsc, I was only seeing offsets of ~15 pixels.

Below is PJ48_217, one of the large offset images, with limbs marked.
I'm curious if "mis-fit" on right will get better when PJ48 reconstructed SPK shows up.

Attached Image
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Posts in this topic
- mcaplinger   Juno Perijove 48   Jan 28 2023, 04:48 PM
- - mcaplinger   To correct some misimpressions I have heard in var...   Jan 29 2023, 03:54 AM
- - Antdoghalo   Sorry your awesome camera is having problems, It h...   Jan 29 2023, 06:33 AM
- - Gerald   QUOTE (mcaplinger @ Jan 28 2023, 05:48 PM...   Jan 29 2023, 06:27 PM
|- - mcaplinger   QUOTE (Gerald @ Jan 29 2023, 10:27 AM) Co...   Jan 29 2023, 10:18 PM
|- - Gerald   QUOTE (mcaplinger @ Jan 29 2023, 11:18 PM...   Jan 29 2023, 11:47 PM
- - vjkane   There are good engineers working the issue(s). I w...   Jan 29 2023, 10:42 PM
|- - StargazeInWonder   It's an understatement to say that JunoCam has...   Jan 30 2023, 12:46 AM
- - Decepticon   Wait the imager has totally failed? Or did it faul...   Jan 30 2023, 02:47 AM
|- - stevesliva   QUOTE (Decepticon @ Jan 29 2023, 09:47 PM...   Jan 30 2023, 04:44 PM
- - Brian Swift   PJ48 Reduced Resolution Exaggerated Color/Contrast...   Jan 30 2023, 04:58 AM
- - Brian Swift   Jupiter and Ganymede PJ48_215 Crop   Jan 30 2023, 05:33 AM
- - volcanopele   Glad to see that the camera overall is still okay,...   Jan 30 2023, 02:38 PM
- - Gerald   Here is PJ48, image #216, roughly illumination-adj...   Jan 30 2023, 08:29 PM
|- - Bjorn Jonsson   QUOTE (Gerald @ Jan 30 2023, 08:29 PM) Bu...   Jan 31 2023, 12:07 AM
|- - StargazeInWonder   Responding to some of the implications of the past...   Jan 31 2023, 04:41 AM
- - Gerald   In the meanwhile, I've done some quantitative ...   Jan 31 2023, 01:39 AM
|- - mcaplinger   QUOTE (Gerald @ Jan 30 2023, 05:39 PM) Yo...   Jan 31 2023, 06:05 PM
|- - Gerald   QUOTE (mcaplinger @ Jan 31 2023, 07:05 PM...   Feb 1 2023, 02:07 AM
- - Gerald   Juno's very eccentrical orbit was designed to ...   Jan 31 2023, 05:22 PM
- - Bjorn Jonsson   Gerald understood correctly what I was saying. How...   Feb 1 2023, 01:35 AM
|- - StargazeInWonder   Bjorn, can the imagery of Ganymede taken during th...   Feb 1 2023, 02:49 AM
- - Brian Swift   FWIW, mapping my (less rigorous) color balance upd...   Feb 1 2023, 07:34 AM
- - Bjorn Jonsson   Image PJ48_215 in approximately true color/contras...   Feb 5 2023, 01:41 AM
- - Bjorn Jonsson   And this is image PJ48_219:   Feb 5 2023, 09:31 PM
- - Bjorn Jonsson   This is image PJ48_218, a methane filter image: ...   Feb 10 2023, 12:28 AM
- - Bjorn Jonsson   I should mention that interestingly, I have found ...   Feb 11 2023, 11:51 PM
- - Brian Swift   QUOTE (Bjorn Jonsson @ Feb 11 2023, 03:51...   Feb 17 2023, 06:58 AM


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