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Horizon tonight 9pm BBC2



 
 
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  #11  
Old October 22nd 05, 03:35 PM
Gaz
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Default Horizon tonight 9pm BBC2


Henry wrote:
Why do we pay the BBC extortion
fee?

Henry


So the Mitchells can return to EastEnders?

  #12  
Old October 22nd 05, 05:12 PM
Peter Hayes
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Default 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  
Old October 22nd 05, 05:29 PM
Jonathan Silverlight
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Default 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.
--
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Remove spam and invalid from address to reply.
  #14  
Old October 22nd 05, 09:43 PM
Robert Geake
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Default 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  
Old October 22nd 05, 10:14 PM
Jonathan Silverlight
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Default 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  
Old October 23rd 05, 01:42 PM
doug dwyer
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Default 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  
Old October 23rd 05, 04:05 PM
Peter Hayes
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Default 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  
Old October 23rd 05, 04:39 PM
Hils
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Default 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  
Old October 23rd 05, 06:01 PM
Jonathan Silverlight
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Default 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  
Old October 23rd 05, 07:44 PM
Peter Hayes
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Posts: n/a
Default 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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