http://groups-beta.google.com/group/...er+Anomaly&rnu
m=1&hl=en#86c8eff2e8ecdddb

Yes E^2 = energy/volume = pressure
but what E?

Reference:


Study of the Pioneer Anomaly:
A Problem Set Slava G. Turyshev,
Michael Martin Nieto,
and John D. Anderson
(Dated: February 24, 2005)
http://xxx.lanl.gov/abs/physic*s/0502123


TABLE IV: Error Budget: A Summary of Biases and
Uncertainties


Solar radiation pressure at many AU:


..03 (+/- .01) x 10^-8 cm/sec^2


is insignificant to observed deceleration of:


8.74 (+/- 1.33) x 10^-8 cm/sec^2


Actual pressure on Pioneer space craft in more in line
with vacuum energy


rho c^2


where


rho = ~6 x 10^-30 g/cm^2


corresponding to estimate of dark energy_matter density


Richard Saam