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#11
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Henry Spencer wrote:
In article , Revision wrote: On the plus side, the mission cost "only" $3.3 billion and likely would have been much more if the original design had prevailed... Moreover, it only barely survived as it was -- it would probably be dead and largely forgotten, like its brother CRAF, had not the Huygens probe represented a major international commitment that was difficult to cancel. I remember that. ISTR somebody at or near the top of the Eurpoean space heierarchy sent a letter to somebody in the U.S. that said "You *******s better not back out now! We busted our asses on this thing and if you pull out now you'll have zero credibility left with us." (One can only imagine the reply such a letter would elicit today.) I also remember the groundswell of tree-hugger opposition to Cassini's launch from those who feared the spread of radiation if there was a launch failure, or if the subsequent earth flyby missed and sent plutonium streaking across the sky. They made a lot of noise and even had a "Stop Cassini Now" campaign and petition with a fair number of signatures on it IIRC. So the naysayers' signatures wound up being recycled into toilet paper while some of *our* signatures ended up going to Saturn. It turned out pretty well I think. -- bp Proud Member of the Human O-Ring Society Since 2003 |
#12
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Dr. Porco explained them (in layman's terms) on NASA TV, and she didn't seem fazed. It's regular "interference" from within the camera circuitry and should be easy to filter. It appears to me that the waves show up the most on the images which contain the least amount of light such as the dark-side ring photos. Notice there is no interference on the bright side photos. Now what I want to know is when are the Titan images gonna show up?? The official site says the images are going to be downloaded Friday afternoon - did they mean Saturday afternoon? Can't wait to see those, unless they're all optical in which case they will probably be pretty boring! Leigh Orf, space nut Assistant Professor of Atmospheric Science Central Michigan University In sci.space.policy Alex R. Blackwell wrote: OM wrote: Alex? Any comments from your friends at JPL on what's up with this? I'm not sure what you are referring to. However, I understand there's a 2 Hz signal in some of the ISS raw data but these are being deconvolved in the processed imagery. Typically, "banding" in raw imagery is due to some hardware problem such as stray light (i.e., a "light leak" of the type in the Mars Odyssey THEMIS system), though I haven't heard of that problem with ISS. -- Alex R. Blackwell University of Hawaii |
#13
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Bruce Palmer wrote:
I remember that. ISTR somebody at or near the top of the Eurpoean space heierarchy sent a letter to somebody in the U.S. that said "You *******s better not back out now! We busted our asses on this thing and if you pull out now you'll have zero credibility left with us." (One can only imagine the reply such a letter would elicit today.) Yes, ESA's role in "saving Cassini" from the budget axe is less well-known but no less important than the support from other quarters. And it also helped that American relations with Europe were, shall we say, in a little better shape in the Clinton-Gore-Goldin era. As hard as it is to believe now, NASA was during the mid to late 1990's, in the process of concluding an MOA with CNES, the *French* national space agency, for a joint series of missions culminating in Mars sample return. -- Alex R. Blackwell University of Hawaii |
#14
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DeSelby wrote:
Now what I want to know is when are the Titan images gonna show up?? The official site says the images are going to be downloaded Friday afternoon - did they mean Saturday afternoon? Can't wait to see those, unless they're all optical in which case they will probably be pretty boring! I'm not sure what you're driving at. All of the T0 imagery are on the ground and the raw data are available online. -- Alex R. Blackwell University of Hawaii |
#15
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Pat Flannery wrote: Actually, that is what the rings really look like at close range- there is a explanation of what causes the "waves" he http://spaceflightnow.com/cassini/040701science.html There are also spiral rings! This is one cool looking planet. Pat I had always assumed gaps in Saturn's rings corresponded to orbital periods resonant with Saturn's moons. Sort of like mini-Kirkwood gaps. Those spiral designs boggle my mind. I can't imagine what formed them. -- Hop David http://clowder.net/hop/index.html |
#16
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On 2004-07-03, DeSelby wrote:
Now what I want to know is when are the Titan images gonna show up?? The official site says the images are going to be downloaded Friday afternoon - did they mean Saturday afternoon? Can't wait to see those, unless they're all optical in which case they will probably be pretty boring! Non-optical images? I think you mean 'visible'... ;-) http://saturn.jpl.nasa.gov/multimedi.../raw/index.cfm has the raw unprocessed images. Have fun... -- -Andrew Gray |
#17
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In article ,
Hop David wrote: I had always assumed gaps in Saturn's rings corresponded to orbital periods resonant with Saturn's moons. Sort of like mini-Kirkwood gaps. That was the original idea -- Cassini's Division is resonant with Mimas, for example -- but it's been known since the Voyager flybys that the real story must be more complicated. For example, Cassini's Division is not really entirely empty -- it's full of faint ringlets -- and there simply aren't enough moonlets found to account for all the fine subdivisions, even before you get into weirdness like spiral and braided structures. -- "Think outside the box -- the box isn't our friend." | Henry Spencer -- George Herbert | |
#18
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David M. Palmer wrote: The original poster was asking about something else: groups of scan lines that are brighter and darker, giving the image a corrugated appearance. When I saw the scalloped edge of the ring, I thought it was some sort of imaging artifact; it came as quite a surprise to me that it actually had that appearance. Pat |
#19
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DeSelby wrote: Now what I want to know is when are the Titan images gonna show up?? The official site says the images are going to be downloaded Friday afternoon They're up here now: http://saturn.jpl.nasa.gov/multimedi...browseLatest=1 - did they mean Saturday afternoon? Can't wait to see those, unless they're all optical in which case they will probably be pretty boring! Actually they have some neat features visible on them, particularly this: http://saturn.jpl.nasa.gov/multimedi...eiImageID=6978 and this: http://saturn.jpl.nasa.gov/multimedi...eiImageID=6986 Are the dark markings the hypothesized seas? (The little "o" shaped thing is apparently something on the camera, and not an actual feature on the surface.) Pat |
#20
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On Sat, 03 Jul 2004 20:03:23 -0500, Pat Flannery
wrote: Are the dark markings the hypothesized seas? ....Actually, as soon as I get through the remaining 28 photo shoots I have to sort through, clean up, and post online, I'm going to start doing some of my own image analysis and see what comes up. I'm more interested in the white stuff poking through, especially if it's still there on the next pass. Alex, are your contacts saying anything about whether this is just cloud formation, or possibly something sticking up through the haze enough to stand out in the IR? (The little "o" shaped thing is apparently something on the camera, and not an actual feature on the surface.) ....It's light being refracted around a dust particle that either is stuck to the lens or imbedded. Rest assured that for my Swiss Army Probe core design, a brush on an armature will be standard equipment, or at least some method to remove dust particles. OM -- "No ******* ever won a war by dying for | http://www.io.com/~o_m his country. He won it by making the other | Sergeant-At-Arms poor dumb ******* die for his country." | Human O-Ring Society - General George S. Patton, Jr |
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