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Horizon tonight 9pm BBC2
Henry wrote: Why do we pay the BBC extortion fee? Henry So the Mitchells can return to EastEnders? |
#12
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Horizon tonight 9pm BBC2
Zanziba wrote:
"James Hill" wrote in message ... "astrog" wrote in message ... All about Cassini/Titan, hope theres no explosions :-) Astrog If there were any explosions, they didn't wake me up! ;o) Seriously, I really did fall asleep! I videod it for the kids at school but wrote it off as too dull for them hald way through. A real dissapointment. The way they overcame the antenae problem was pure genius however. Shame they forgot to switch the second receiver on, though. -- Peter |
#13
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Horizon tonight 9pm BBC2
In message , Peter
Hayes writes Zanziba wrote: "James Hill" wrote in message ... "astrog" wrote in message ... All about Cassini/Titan, hope theres no explosions :-) Astrog If there were any explosions, they didn't wake me up! ;o) Seriously, I really did fall asleep! I videod it for the kids at school but wrote it off as too dull for them hald way through. A real dissapointment. The way they overcame the antenae problem was pure genius however. Shame they forgot to switch the second receiver on, though. It's my understanding that the transmitters and data streams were intended to be redundant, with a short delay in case something was lost on one stream. It was decided to use two different streams and get double the results - except for the wind speed measurements which were completely lost (and resurrected by the fortuitous reception on Earth). But how close did they come to leaving _both_ receivers turned off?? ESA has been extraordinarily lucky. The other thing that hasn't been mentioned much is that Cassini had a major problem at Jupiter, which lost some data there. But what was returned compares quite well with the total amount of atmospheric science returned by Galileo (thanks to the state of Uncle Sam's roads). Not a very satisfactory "Horizon", though. -- Boycott Yahoo! Remove spam and invalid from address to reply. |
#14
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Horizon tonight 9pm BBC2
"astrog" wrote in message
... All about Cassini/Titan, hope theres no explosions :-) Astrog I was kind of hoping for a decent 3d rendering of the decent based on the real data from the images recovered! Hope...Such a pointless thing |
#15
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Horizon tonight 9pm BBC2
In message , Robert
Geake writes "astrog" wrote in message ... All about Cassini/Titan, hope theres no explosions :-) Astrog I was kind of hoping for a decent 3d rendering of the decent based on the real data from the images recovered! Hope...Such a pointless thing If there was such a thing, wouldn't it already be on one of the "official" web sites, or even one of the amateurs who are processing the same data and don't have papers to write and reputations to lose :-) On the subject of things we haven't seen yet, have there been any published results from the Aerosol Collector and Pyrolyser? |
#16
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Horizon tonight 9pm BBC2
In message , Jonathan Silverlight
writes The other thing that hasn't been mentioned much is that Cassini had a major problem at Jupiter, which lost some data there. But what was returned compares quite well with the total amount of atmospheric science returned by Galileo (thanks to the state of Uncle Sam's roads). Got bored with the prog only old news. My "that was lucky" observation relates to the mis-understanding between teams where the dependence on modulation phase? For synchronisation between Cassini and Hygens was such that if the original path for Cassini was kept they would never have synchronised at all, the carrier doppler was catered for not the modulation resulatant..phase. This was spotted by a Swedish engineer 6 months before and the trajectory changed to reduce differential velocity. Good story never fully released. Note the same mistake was made in New Scientist in their back page in the answer to the question" how fast can you travel for the cellular phone link to fail due to doppler." -- dd |
#17
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Horizon tonight 9pm BBC2
Jonathan Silverlight
wrote: The other thing that hasn't been mentioned much is that Cassini had a major problem at Jupiter, which lost some data there. But what was returned compares quite well with the total amount of atmospheric science returned by Galileo (thanks to the state of Uncle Sam's roads). What was that about? And how do "Uncle Sam's roads" come into it? -- Peter |
#18
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Horizon tonight 9pm BBC2
Henry wrote
Why do we pay the BBC extortion fee? Because you're happy with a program of celebrity and/or makeover and/or game shows, soaps and paraphrased neoconservative propaganda. -- Hil |
#19
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Horizon tonight 9pm BBC2
In message , Peter
Hayes writes Jonathan Silverlight wrote: The other thing that hasn't been mentioned much is that Cassini had a major problem at Jupiter, which lost some data there. But what was returned compares quite well with the total amount of atmospheric science returned by Galileo (thanks to the state of Uncle Sam's roads). What was that about? And how do "Uncle Sam's roads" come into it? Sorry, I was being deliberately cryptic :-) The original mission plan called for Galileo to spend a lot of time between flybys of moons looking at Jupiter, and sending thousands of pictures back to Earth via the High Gain Antenna. The HGA failed to open, probably because the lubrication rubbed off the struts, so they had to improvise a method using the low gain antenna and a transmission speed of a few bits per second. It rubbed off because they decided to save money and transport Galileo to California and back by road, rather than flying, and the bumps on the roads were too much for the package. Oddly enough, if they hadn't delayed the flight and done more checks they would probably have lost the whole mission because of some major problem. I can't remember the details but it's a fairly widely known story. The other thing I don't recall seeing much of in these programmes is the anti-nuclear protesters, who were saying Cassini should be diverted right up to the Jupiter encounter (they had some idea it would magically come back to Earth if the reaction wheel failed). Perhaps someone has finally realised that they are just a handful of people with placards. |
#20
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Horizon tonight 9pm BBC2
Jonathan Silverlight
wrote: In message , Peter Hayes writes Jonathan Silverlight wrote: The other thing that hasn't been mentioned much is that Cassini had a major problem at Jupiter, which lost some data there. But what was returned compares quite well with the total amount of atmospheric science returned by Galileo (thanks to the state of Uncle Sam's roads). What was that about? And how do "Uncle Sam's roads" come into it? Sorry, I was being deliberately cryptic :-) And I rose to the bait... The original mission plan called for Galileo to spend a lot of time between flybys of moons looking at Jupiter, and sending thousands of pictures back to Earth via the High Gain Antenna. The HGA failed to open, probably because the lubrication rubbed off the struts, so they had to improvise a method using the low gain antenna and a transmission speed of a few bits per second. It rubbed off because they decided to save money and transport Galileo to California and back by road, rather than flying, and the bumps on the roads were too much for the package. That's the bit I didn't know, thanks. Oddly enough, if they hadn't delayed the flight and done more checks they would probably have lost the whole mission because of some major problem. I can't remember the details but it's a fairly widely known story. Was it due to go up on the Challenger that exploded? Or is the timescale wrong? The other thing I don't recall seeing much of in these programmes is the anti-nuclear protesters, who were saying Cassini should be diverted right up to the Jupiter encounter (they had some idea it would magically come back to Earth if the reaction wheel failed). Perhaps someone has finally realised that they are just a handful of people with placards. There were protests prior to launch from environmentalists concerned that if the rocket exploded the plutonium power source would disintegrate and contaminate much of Florida. And some were worried over the slingshot past Earth in case it got too close and burned up, spreading plutonium everywhere. -- Peter |
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