The observed mutual occultation/eclipsing events revealed, that "Bridges" is a binary asteroid, that is orbited every hours by a minor-planet moon. A refined orbital period of 16.317 hours was later published. Based on the system's secondary-to-primary mean-diameter ratio of , the satellite measures approximately kilometers in diameter. Johnston's Archive also estimates a semi-major axis of 13 kilometers for the moon's orbit. This minor planet was named after Patricia M. Bridges, planetary cartographer with the United States Geological Survey. Bridges has created detailed maps of several planetary body's surface features, and has been an airbrushing expert for shaded lunar relief maps based on spacecraft images. The approved naming citation was published by the Minor Planet Center on 12 December 1989 ().