IMPROVED BOUNDS ON NONLUMINOUS MATTER IN SOLAR ORBIT

We improve, using a larger set of observations including Voyager 2 Nep tune flyby data, previous bounds on the amount of dark matter (DM) tra pped in a spherically symmetric distribution about the Sun. We bound D M by noting that such a distribution would increase the effective mass of the Sun as seen by the outer planets and by finding the uncertaint y in that effective mass for Uranus and Neptune in fits to the JPL dev elopmental ephemeris residuals, including optical data and those two p lanets' Voyager 2 flybys. We extend our previous procedure by fitting more parameters of the developmental ephamerides. In addition, we pres ent 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 distribu tions 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 .