Odd Galileo Observations |
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Odd Galileo Observations |
 Mar 15 2007, 09:53 PM
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#1
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 Administrator  Group: Chairman Posts: 13245 Joined: 8-February 04 Member No.: 1  |
Perusing the PDS, looking for some ring-obs to compare with the NH stuff that's just come down... are these Galileo ring obs or something else?
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Mar 15 2007, 09:55 PM
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#2
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 Interplanetary Dumpster Diver Group: Moderator Posts: 4045 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
QUOTE (djellison @ Mar 15 2007, 09:53 PM)  Perusing the PDS, looking for some ring-obs to compare with the NH stuff that's just come down... Those are auroral observations. It took several during the mission with SSI (using the Violet filter I think, though I could be wrong). -------------------- |
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Mar 15 2007, 10:10 PM
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#3
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Administrator Group: Chairman Posts: 13245 Joined: 8-February 04 Member No.: 1 |
Ahhh...
http://photojournal.jpl.nasa.gov/catalog/PIA01603 http://photojournal.jpl.nasa.gov/catalog/PIA01602 http://photojournal.jpl.nasa.gov/catalog/PIA01601 http://photojournal.jpl.nasa.gov/catalog/PIA01600 I was just ploughing through and thought "oo - that looks a bit like some of the Saturning rings..." - didn't think Aurora.... cools stuff, that's for sure  I'm going down to the UK's RPIF next month to grab all the Galileo stuff off their CD's hopefully. Doug |
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Mar 15 2007, 10:16 PM
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#4
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Administrator Group: Chairman Posts: 13245 Joined: 8-February 04 Member No.: 1 |
Other odd pictures...
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Mar 15 2007, 10:22 PM
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#5
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 Senior Member Group: Members Posts: 3534 Joined: 1-October 05 From: Croatia Member No.: 523 |
Would that be an Io - Amalthea mutual event?
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Mar 15 2007, 10:28 PM
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#6
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Administrator Group: Chairman Posts: 13245 Joined: 8-February 04 Member No.: 1 |
I think it is - shows the albedo difference.
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Mar 15 2007, 11:15 PM
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#7
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 Senior Member Group: Moderator Posts: 2817 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
Do you have the date and time for that observation?
-------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Mar 15 2007, 11:21 PM
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#8
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Administrator Group: Chairman Posts: 13245 Joined: 8-February 04 Member No.: 1 |
IMAGE_TIME = 1997-11-06T20:36:51.484Z
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Mar 15 2007, 11:26 PM
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#9
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Senior Member Group: Moderator Posts: 2817 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
Nice Catch. I thought it was one of those on-chip double exposures like they did with the Eclipse images.
EDIT: I'm guessing this was never imaged:
MORE EDIT: I'm surprised I never noted this myself. I've obviously played around with that observation: http://www.unmannedspaceflight.com/index.p...ost&p=85847 -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Mar 15 2007, 11:36 PM
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#10
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Interplanetary Dumpster Diver Group: Moderator Posts: 4045 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
There were more images in the series. As I understood it at the time, this was totally serendipitous - they noticed Amalthea there after the fact, and transmitted that part of the image.
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Mar 15 2007, 11:46 PM
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#11
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Administrator Group: Chairman Posts: 13245 Joined: 8-February 04 Member No.: 1 |
It's a bit odd - like a lot of SSI images, they are tightly cropped subframes. Strangely, this was at IMAGE_TIME = 1997-11-06T20:36:43.746Z and is on the PDS as two subframes - the second tiny one of Am is from the same taken image, but I guess downlinked as a seperate subframe. Then 8 seconds later it looks quite a bit smaller in that previous image. Odd. The LBL's don't show any downsizing, and they are different observation names in the header.
Doug
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Mar 16 2007, 12:37 AM
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#12
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Interplanetary Dumpster Diver Group: Moderator Posts: 4045 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
The observation was a color view of Io. All but one of the images were binned 2x2. So the others suffer from 2x2 binning, which is why it appears so much smaller. Also, many of the Galileo images occur in pairs, often with the second one being transmitted at a lower compression ratio (and sometimes cropped in more to avoid wasted bandwidth.
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Mar 16 2007, 08:15 AM
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#13
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Administrator Group: Chairman Posts: 13245 Joined: 8-February 04 Member No.: 1 |
So which PDS header thing am I missing - because what you're saying makes sense, but I can't see downsizing in the header at all
Doug |
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Mar 16 2007, 10:34 AM
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#14
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Interplanetary Dumpster Diver Group: Moderator Posts: 4045 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
I inferred it from the horizontal and vertical pixel scales.
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Mar 16 2007, 11:40 AM
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#15
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Interplanetary Dumpster Diver Group: Moderator Posts: 4045 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
I always thought this shot of Metis was neat.
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