Craig Markwardt wrote in message ...
(Nodem Info. Sys.) writes:
I've had time to study the Cassini measurements and yes, there is no
anomaly. However, the reason for this is the way the measurement
methos differs from the other probes. The Cassini time-delay
measurement should show no real change in the velocity, which is
expected and fully consistent with my result.

You are in fact incorrect. The recent Cassini results published in
Nature are based on radiometric Doppler tracking, just as the Anderson
et al results for Pioneer 10, 11, and other spacecraft results were.

The difference is that the Cassini spacecraft is able to transpond at
dual frequencies, so analysts are able to correct for the solar plasma
more precisely than for previous spacecraft. Thus, the Cassini data
are even more sensitive to velocity changes than the previous data
were.

CM

I guess I should have been a bit more specific. The Doppler tracking
data includes a 'modeled' acceleration, which is partly determined by
the time-delay measurement. In gr-qc/0308010, this is given as -26.7
* 10^-8 cm/s^2, and it would appear that the 'Pioneer anomaly' has
been inadvertently rolled into this number, but still makes up less
than a third of it.

The Cassini spacecraft doesn't make the best platform to test the
Pioneer anomaly, but it has shown that this anomaly is not a real
change in velocity (ruling out alternative gravity theories).

My prediction implies an 'apparent' deceleration of 8.14 * 10^-8
cm/s^2 in radial velocity. So far no observations have disagreed with
this.