An instrument carried by the Galileo Orbiter that was designed to measure the movement of the dust stream in the vicinity of Jupiter. The dust detector was able to measure the distribution, spatial extent, and orbital trajectories of the submicrometre-sized dust particles and to determine if there is indeed a dust wedge, hypothesized to extend for about 700  000km about 10° above and below the jovian equator and to result from volcanic activity on Io. The instrument also measured the electrical charge on larger particles entering it.