The Hartung–Boothroyd Observatory (HBO) is located atop Mount Pleasant near the Cornell University in Ithaca, New York (USA). It is used mainly as a teaching facility for upper-level undergraduate astronomy classes. The observatory is named to recognize funding from M. John Hartung, a 1908 Cornell graduate and later chemical industrialist, and to honor Samuel L. Boothroyd, the founder of Cornell's Department of Astronomy. The facility was designed and directed from 1974-2012 by James R.