[time-nuts] Water on Enceladus - What does this imply about NASA'a ability to measure frequency?
lists at rtty.us
Fri Apr 4 07:30:07 EDT 2014
Back when they were designing this stuff, they were very interested in getting into the parts in 10 to the 15th. They didn’t get there, but that was the desire.
On Apr 4, 2014, at 2:17 AM, Chuck Forsberg WA7KGX <caf at omen.com> wrote:
> One needs to know the carrier frequency. Must be a high quality reference
> for the Cassini transmitter.
> On 04/03/2014 08:17 PM, Chris Albertson wrote:
>> I just read about a discovery of a liquid water ocean on Saturn's moon
>> Enceladus. The method used was to measure the velocity of a
>> spacecraft as it makes a close fly-by. Gravitational anomalies will
>> cause the spacecraft to speed up or slow down as it flies over massive
>> objects like mountains. With three pass they now have a 3 dimensional
>> map of density distribution. It must be very sensitive if they can
>> tell liquid water from ice by its gravitational field. (or even rock
>> from ice)
>> They say they can measure the spacecraft's velocity to 90 microns per
>> second. They do this by measuring the Doppler sift of the
>> transmitter. I've been trying to figure out what 90 microns/sec
>> means in terms of frequency. But I think(?) I need to know the
>> orbital velocity of Enceladus.
> Chuck Forsberg WA7KGX caf at omen.com www.omen.com
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