  We searched the COBE DIRBE Sky and Zodi Atlas for a wake of dust trailing
Mars and for Trojan dust near Jupiter's L5 Lagrange point. We compare the DIRBE
images to a model Mars wake based on the empirical model of the Earth's wake as
seen by the DIRBE and place a 3-sigma upper limit on the fractional overdensity
of particles in the Mars wake of 18% of the fractional overdensity trailing the
Earth. We place a 3-sigma upper limit on the effective emitting area of large
(10-100 micron diameter) particles trapped at Jupiter's L5 Lagrange point of 6
x 10^17 cm^2, assuming that these large dust grains are distributed in space
like the Trojan asteroids. We would have detected the Mars wake if the surface
area of dust in the wake scaled simply as the mass of the planet times the
Poynting-Robertson time scale.
