We improve, using a larger set of observations including Voyager 2 Neptune flyby data, previous bounds on the amount of dark matter (DM) trapped in a spherically symmetric distribution about the Sun. We bound DM by noting that such a distribution would increase the effective mass of the Sun as seen by the outer planets and by finding the uncertainty in that effective mass for Uranus and Neptune in fits to the JPL developmental ephemeris residuals, including optical data and those two planets' Voyager 2 flybys. We extend our previous procedure by fitting more parameters of the developmental ephamerides. In addition, we present here the values for Pioneer 10, Pioneer 11, Voyager 1, and Voyager 2 Jupiter-ranging normal points (and incorporate these data as well). Our principal result is to limit DM in spherically symmetric distributions in orbit about the Sun interior to Neptune's orbit to less than Earth mass and interior to Uranus's orbit to about 1/6 of Earth's mass.
[1]
Chris Stormer,et al.
Explanatory Supplement to the Astronomical Almanac
,
1995
.
[2]
E. Standish.
The observational basis for JPL's DE 200, the planetary ephemerides of the Astronomical Almanac
,
1990
.
[3]
M. Bailey,et al.
The Origin of Comets
,
1990
.
[4]
G. Kane.
Modern elementary particle physics
,
1987
.
[5]
Michael S. Turner,et al.
The early Universe
,
1981,
Nature.
[6]
Axel Corlin,et al.
Origin of Comets
,
1958,
Nature.