Ten Acre Observatory in Tribbey, Oklahoma, is an astronomical observatory that serves central Oklahoma. Owned and operated by Nick Lazzaro, it also functions as the primary observing site for the Odyssey Astronomy Club. Its main instruments are a 20-inch f/4.5 Starmaster telescope and a 13-inch Coulter Optics telescope. The observatory is open to the public by appointment, and access to its equipment and services is provided free of charge.