On 6/9/17 6:26 AM, Craig Markwardt wrote:
On Friday, June 9, 2017 at 5:40:00 AM UTC-4, wrote:
..but i try again to understand : on the beginning , without the suspected anomaly ,

they observed like a deceleration of their ground clocks
.. but the ground and in-rocket cloks were good .. is it so the history ?
... or like the rocket was sending a frequency ,
but this frequency was lower than the waited-one ... is it so ?

Actually it's possible to see what navigators and analysts
were thinking about at the time because they wrote
about their concerns regularly and published it in a journal.
It's called the DSN Progress Report,
and all of the issues are online dating back to 1971 (just google for the term).
They were thinking about clocks, yes,
but also anything else that could bias the signal.
Gas leaks in the propulsion system was a big concern,
and were known to be active at some times early in the mission.
Modeling of solar radiation pressure was a big deal
and analysts were perfecting the process,
but there was always the concern about the change in optical properties
of the spacecraft coatings (darkening of white coatings), etc.

CM

Good to see the Pioneer Anomaly still under discussion.
For your consideration and something missing from previous analysis,
the Pioneers' were probing the fringes of interstellar space
and not limited by heliocentric and geocentric thinking
that drives the JPL statement
http://arxiv.org/abs/1204.2507
"no statistically significant acceleration anomaly exists."

This JPL statement is based on incomplete analysis of the data
assuming the decay for Pioneer acceleration aP

daP/dt = -k*aP model one

This fits the assumption that
the thousands of analyzed aP thermal components
are tied to the RTG half life with aP decay approaching zero with time.

A better fit to trajectory data is the 'aPinfinity' effect
as the Pioneers approached interstellar space:

daP/dt = -k*(aP - aPinfinity) model two

Initially, as the Pioneers pass Jupiter,
the thermal emission overwhelms
the anomalous acceleration (aPinfinity)
making it statistically insignificant in this initial trajectory phase
but diminishes with time(model one)
with aP decay approaching aPinfinity
with time (model two)
as the Pioneers probe interstellar, intergalactic space
on leaving the solar system
with diminished internal thermal and external solar wind
considerations previously considered.

Statistically significant aPinfinity values a
Pioneer 10 aPinfinity 7.0x10^-10 m/sec^2
Pioneer 11 aPinfinity 8.2x10^-10 m/sec^2

These values may represent a constant for interstellar medium
within some standard deviation
or actually represent different values based on
differing Pioneer 10 and 11 directional probes of interstellar medium.
The interstellar medium may not be uniform.

Logically, in as much as aPinfinity
is a measure of space-Pioneer momentum transfer (spacetime viscosity)
then all transiting object motion would be affected.
This has implication for galactic and planetary system formation.

Apparently there is still some unpublished Pioneer data
to further test this hypothesis.
Considering this data's importance to the scientific community,
it should be published.

RDS