Neptune anomaly

[[this is really more over in sci.astro.research territory, so I have
added a cross-post there, and set followups to s.a.r only]]

I.Vecchi wrote:
Browsing NASA's "Multimedia Space Educator Handbook" I found this.

"Pluto is now known to be far too small to have caused the apparent
differences between Neptune's predicted and observed orbits, however,
and the source of these differences remains unresolved."([1])

I would be grateful for any pointer to such unresolved deviations.

I don't recall the reference, but I recall reading a paper in the
Astronomical Journal dated sometime in the 1980s, which concluded
that after due consideration of the error bars in the observations,
there were no unresolved deviations. That is, the authors found that
the modern (very accurately known) orbits of the outer planets did
indeed fit all the observations (including the older ones) to within
reasonable estimates of the observational accuracy.

ciao,

--
-- "Jonathan Thornburg -- remove -animal to reply"
Max-Planck-Institut fuer Gravitationsphysik (Albert-Einstein-Institut),
Golm, Germany, "Old Europe" http://www.aei.mpg.de/~jthorn/home.html
"Washing one's hands of the conflict between the powerful and the
powerless means to side with the powerful, not to be neutral."
-- quote by Freire / poster by Oxfam