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ScRamjet
User Rank
Freelancer
Too Bad
ScRamjet   8/19/2014 8:30:38 AM
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 They can't beam a modern CPU / Ram set to Rosetta. Technology has inproved by orders of magnitude in 10 years.

Now for the same weight and less power, they could be using an onboard Computation to have Rosetta calculate it's own corrections.

This would require a rangefinder (pulse LASER?) and very sensitive accelerometers to determine proximity / orbit deflection and then adjust accordingly.

I notice they don't mention the onboard fuel for corrections, this is also limited, but hopefully they have plenty for now.

All in all, a very interesting problem.

DrQuine
User Rank
CEO
In orbit around a small comet
DrQuine   8/17/2014 5:50:48 PM
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The fact that Rosetta has traveled billions of miles to find and orbit a comet that is only 2.5 miles by 2.2 miles is extraordinary. As I understand, escape velocity from the comet is about 1 mph so if we walked on the surface, we'd "launch" off the surface, leave the comet's gravitational field, and be floating in space. It is hard to imagine the fine adjustments that must be made by Rosetta to remain in the vicinity.

Max The Magnificent
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Blogger
Re: My memory isn't what it used to be...
Max The Magnificent   8/14/2014 3:45:56 PM
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@kfield: I emailed Andrea Accomazzo of ESA to shed some light on your question and here is his answer...

Ah ha -- I thought you meant a financial budget, not a CPU-cycle budget ... now all becomes clear -- thanks for following up on this

kfield
User Rank
Blogger
Re: flatulent frat boy
kfield   8/14/2014 3:44:57 PM
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@maxmaxfield "I've been told that I have the face to be a radio anouncer (wait a minute... :-)"

I may have suggested that to you once in the past, but I was only joking. :-)

kfield
User Rank
Blogger
Re: My memory isn't what it used to be...
kfield   8/14/2014 3:43:47 PM
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@maxmaxfield :So if they'd had a larger budget, the operating system would have been allowed to access the other half of the RAM?"

I emailed Andrea Accomazzo of ESA to shed some light on your question and here is his answer:

"Yes, we could use part of the RAM extension but the CPU budget would decrease i.e. we would have the risk that the computer would not be able to run all the actions it has to run within the allocated time i.e. activities on-board would start being delayed which would be catastrophic for the mission. 

Proper timing of orbital and attitude manoeuvres is essential for mission success. If the spacecraft can not execute them then we could not manoeuvre properly around the comet. 

In reality the on-board computer has a protection against over-run but it would re-boot thus entering a safe status where all programmed activities would be de-scheduled i.e. the mission would be temporarily interrupted with an obvious disruption of science production and delays."

David Ashton
User Rank
Blogger
Re: comet entrails
David Ashton   8/12/2014 6:28:03 PM
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@EETCowie....Ivan, the caption competition is on another page (but I see you've been busy there as well :-)

David Ashton
User Rank
Blogger
Re: flatulent frat boy
David Ashton   8/12/2014 6:26:20 PM
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@Max.... I didn't tell you I was into BDSM, did I?? :-)

eetcowie
User Rank
Blogger
comet entrails
eetcowie   8/12/2014 1:29:52 PM
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the comet has a heavenly body...

Max The Magnificent
User Rank
Blogger
Re: flatulent frat boy
Max The Magnificent   8/12/2014 10:08:47 AM
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@kfield: ...so they put me to work behind stage...

I've been told that I have the face to be a radio anouncer (wait a minute... :-)

Max The Magnificent
User Rank
Blogger
Re: flatulent frat boy
Max The Magnificent   8/12/2014 10:07:11 AM
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@David: You weren't an actress in a past life were you?

Oooh -- just you wait till she get's her hands on you at EE Live 2015

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