Candidate site for a robotic lunar observatory: The central peak of Riccioli crater

This paper proposes the central peak of Riccioli crater as the most promising site for an initial lunar observatory. If only one site can be chosen, it should be on the near side, close to the limb, in continual line of sight from the Earth and on or close to the equator. The terrain should be suitable for landings, surface transverses and instrument emplacement. Anticipating an eventual manned observatory and surface exploration base, the site should be geologically diverse and have usable material resources. The central peak of Riccioli, 2.5 deg S and 83 deg W, and adjacent areas, meet these requirements and are recommended for initial telerobotic exploration and instrument emplacement. The floor of Grimaldi is suggested for a sub-site or an alternate site.