[time-nuts] Water on Enceladus - What does this imply about NASA'a ability to measure frequency?

Chuck Forsberg WA7KGX caf at omen.com
Fri Apr 4 02:17:57 EDT 2014


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
Developer of Industrial ZMODEM(Tm) for Embedded Applications
   Omen Technology Inc      "The High Reliability Software"
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