Enceladus August 11, 2008 encounter, Close-up observations of plume vents |
Enceladus August 11, 2008 encounter, Close-up observations of plume vents |
Aug 3 2008, 06:54 PM
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Member Group: Members Posts: 933 Joined: 4-September 06 From: Boston Member No.: 1102 |
Just 8 days until the next Enceladus encounter.
CICLOPS Rev 80 Looking Ahead will appear here soon. Cassini Enceladus 080EN Mission Description is here now. We get to fly through the south polar jets again. -Floyd [edit] Soon = somtime before encounter -------------------- |
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Aug 11 2008, 01:42 AM
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Senior Member Group: Moderator Posts: 3241 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
Only the last skeet shot image shown in the attached image from the Looking Ahead article contains a CL1/CL2 BOTSIM. There is a botsim at the start of that trigger, but it is over the nightside.
-------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Aug 11 2008, 01:49 AM
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
The reason there aren't more BOTSIMs might lie in what I wrote about earlier - they're twice as data intensive so might limit the speed at which ISS can take images, which in a high speed flyby is most undesirable. This is due to the fact the SSR recorders and their support system (what was it - the CDS?) can handle up to 384 kbps (I think). It doesn't physically prevent snapping a new picture, but the ISS generated packet buffer is emptied slower into the SSR if both cameras are generating much data and new images have to be "queued" until the buffer is emptied.
As a matter of fact, it's not unusual for CCD frames to have a delayed readout (there's a PDS image flag by that name) if the telemetry pickup is slower than the speed the camera reads out lines from the CCD and encodes them. This messes the dark current calculation as the rest of the image just sits on the CCD for a period of time and one can actually see higher dark currents starting at a certain line in some WAC raw images if you really brighten them. But, I digress... -------------------- |
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