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# observational errors, including measurement and computational errors, in deriving the acceleration
* Approximation/statistical errors
# a real deceleration:
* by gravitational forces from unidentified sources such as the Kuiper belt or dark matter
* drag from the interplanetary medium, including dust, solar wind and cosmic rays
* gas leaks, including fission-produced helium escaping from in the spacecrafts' radioisotope thermoelectric generators
* radiation pressure of sunlight, the spacecraft's radio transmissions, or thermal radiation pressure from the RTGs
* electromagnetic forces due to an electric charge on the spacecraft
Originally posted by HowardRoark
Personally I think it is a nothing more than the fact that we are pushing the limits of technology.
The novel physics methodology of subquantum kinetics predicted in 1979 that photons should blueshift their frequency at a rate that varies directly with negative gravitational potential, the rate of blueshifting for photons traveling between Earth and Jupiter having been estimated to average approximately 1.3±0.65 X 10^-18 s^-1, or 1.1±0.6 X 10^-18 s^-1 for signals traveling a roundtrip distance of 65 AU through the outer solar system. A proposal was made in 1980 to test this blueshifting effect by transponding a maser signal over a 10 AU round-trip distance between two spacecraft. This prediction has more recently been corroborated by observations of maser signals transponded to the Pioneer 10 spacecraft.
Subquantum kinetics is a novel microphysics paradigm that incorporates concepts developed in the fields of system theory and nonequilibrium thermodynamics. One of its distinctive features is that it begins at the subquantum level for its point of departure.
The first time that LaViolette contacted scientists at JPL was in 1980. At that time he told them that his theory predicted that a blueshifting effect should be observed in spacecraft maser signal transmissions and told them the amount of blueshifting that could be expected. John Anderson, who spearheaded this work at JPL was part of the same group of researchers with whom LaViolette had spoken. After that Anderson began to notice the effect in the Pioneer 10 data and finally in 1992 he decided to initiate a formal study of the data.