Juno Perijove 49, March 1, 2023 |
Juno Perijove 49, March 1, 2023 |
Feb 14 2023, 09:35 PM
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Senior Member Group: Moderator Posts: 3241 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
I'm going to choose to be optimistic about PJ49, so with that in mind, I have added previews of JunoCAM's observations of Io for PJ49. Obviously, JunoCAM's real observation plan will likely differ but I added previews for the first and last opportunities to image Io on the pass, a preview of an image nearest closest approach, and one for when Io is near the center of the JIRAM FOV. The observation at closest approach also has the Marduk plume which has a good chance of being observed on this encounter, presuming it is active. The Volund plume might also be visible near the terminator.
The previews use the Voyager/Galileo basemap. The left images were originally projected at the same resolution as JunoCAM but were then enlarged by 5x while the image on the right is the basemap reprojected to 5x the JunoCAM pixel scale. https://pirlwww.lpl.arizona.edu/~perry/Juno/pj49.htm -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Apr 24 2023, 12:52 AM
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Member Group: Members Posts: 425 Joined: 18-September 17 Member No.: 8250 |
Mike,
Can you say if there is an explanation for the increase in "noise floor" between JNCE_2023075_49C01628_V01-raw.png "IMAGE_TIME": "2023-03-16T21:00:30.042" and JNCE_2023075_49C01632_V01-raw.png "IMAGE_TIME": "2023-03-16T22:00:27.920" Plot of mean of raw values. The above times corresponds to the discontinuity on the right. |
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Apr 24 2023, 03:12 PM
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Senior Member Group: Members Posts: 2542 Joined: 13-September 05 Member No.: 497 |
Mike, Can you say if there is an explanation for the increase in "noise floor"... I don't think it's necessary to call me out by name. Others may have answers and it just makes me feel bad if I can't respond. As Stargaze has correctly intuited, these are temperature-related and intentional. I can't say more, but one might search for phrases like "radiation damage" and "room-temperature annealing". Once the PDS volume has been released, it should be fairly obvious what's going on. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Apr 25 2023, 05:56 AM
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Member Group: Members Posts: 425 Joined: 18-September 17 Member No.: 8250 |
I don't think it's necessary to call me out by name. Others may have answers and it just makes me feel bad if I can't respond. Absolutely not my intention to make you feel bad. My wording was intentional. "Can you say...". A response of "I can't say" is perfectly reasonable and understandable if what I observed was some anomaly which you aren't able to discuss due to project/corporate policy/practice. I can fully appreciate not being able to talk about certain work-stuff. However, I didn't know if my observation was an anomaly symptom, an exercise in adjusting gains/CCD-voltage or possibly some environmental (radiation/magnetic field) effect that could now be observed with this unusually long duration and distant image sequence. |
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Apr 30 2023, 07:23 PM
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Senior Member Group: Members Posts: 2542 Joined: 13-September 05 Member No.: 497 |
However, I didn't know if my observation was an anomaly symptom, an exercise in adjusting gains/CCD-voltage... There is no adjustability of gains or CCD voltage in Junocam. About the only thing that can be controlled, to some degree, is the camera head temperature. From the Junocam paper: QUOTE An additional pair of PRTs and redundant etched-foil heaters are attached to the outside of the camera head and thermostatically controlled by the spacecraft. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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