We report on a design for a geosynchronous UV observatory optimized for imaging and spectrography of planets and comets. This solar system telescope (SST), based on a commercial developed spacecraft, was proposed to NASA as a Discovery mission. It can also serve as a low-cost orbiting observatory for other disciplines in space astronomy. The SST consists of a 140-cm-aperture telescope with an instrumentation section comprising four spectrographs and a wide-field UV imager. We use silicon carbide mirrors and a telescope structure provided by the Vavilov State Optical Institute in St. Petersburg, Russia. The spacecraft is derived from Lockheed Martin's commercial remote sensing satellite (CRSS), which provides attitude control, power, communications, and command and data handling, with minimal modifications. Using this approach, we were able to design an observatory with capabilities comparable to the Hubble Space Telescope at approximately 1/20th the cost.