A fully automated aeronomical observatory, whose main optical instruments are a field-widened Fabry-Perot interferometer and a tilting filter photometer, is described. The closed-loop control, data acquisition, and recording systems are based on the Zilog Z80A system of microprocessors and supporting components. The compact system, occupying the living room area of an Airstream trailer, is readily transportable to remote sites for unattended operation, where its operation can be remotely commanded and checked via a telephone link. The optical instrumentation, electronic control system, and operating procedures are discussed, and examples are given of data obtained from such an observatory recently located at Millstone Hill, Massachusetts. The operating experience with this observatory during its two years in the field is described.