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Originally Posted by Jerry
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Originally Posted by Tassel
So, Lunatik, there's a bunch of "data" that you claim we don't have. Do you plan on revising your "hypothesis" so it agrees with these observations? Jerry, how about you?
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If you read Anderson's papers on how the ranging data was obtained on the Pioneer missions, and why other probes cannot be used to unambiguously verify the Pioneer anomalies, it should be clear to you we do not have the capability of measuring Haley's postition with enough accuracy to measure the same accelerations. I have stated this at least a dozen times on this thread. |
Hear, hear! We know what comets do close to home, but are looking at a very wide spectrum of space to locate them far out there. Attach a probe for Doppler ranging, and you might get a clue of what they're up to. Otherwise, it's merely an educated guess within so many arc seconds at 28 AU.
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Originally Posted by Tassel
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Originally Posted by Lunatik
(or one reaction wheel failed, per Tassel's above, by spinning up to 300 rpm vs 50 rpm designed)
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Gawd, this isn't even what the article says. But that's not the point. I'll remind you of what you said: |
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Originally Posted by Lunatik
Before I begin to revise my "hypothesis", how about if we get some data first?
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Well, Cassini's reaction wheels have provided data. This is just one of many data points that you've ignored. [/quote]
Here's the data from the article you referenced, which perhaps I mistranslated in mine:
"In a diagnostic test on Dec. 18, reaction wheel number two still had higher than normal torque, the amount of force needed to turn it, when it was accelerating to a speed of 50 revolutions per minute, but it spun freely at speeds between 50 and 300 rpm."
I had interpreted the "higher torque than normal" as the amount of force needed to overcome inertial resistance, but perhaps this is not what they meant. I suppose it is puzzling that requiring greater torque it then spins freely six times as fast, so really don't know what they mean here. I then went on to read other NASA pages on Cassini's onboard systems:
http://www2.jpl.nasa.gov/basics/bsf13-1.html
Spacecraft Navigation, see "orbit determination" section, for how they "drive" it there.
http://www2.jpl.nasa.gov/basics/bsf11-2.html
Attitude and Spin Control, see "momentum desaturation" or desat, and "inertial reference" items.
I guess we can coin a new slogan for NASA?
"Leave the driving to us!" 8)