The Hirsch Observatory is an astronomical observatory at Rensselaer Polytechnic Institute (RPI) in Troy, New York. It is located on the roof of the Jonsson-Rowland Science Center (seen below) and is used by members of the Rensselaer Astrophysical Society as well as astronomy students in laboratory exercises. It is frequently opened to the community for public viewing sessions. The observatory's main dome contains a 16" Cassegrain Reflector, with a CCD camera and fully computerized controls. The observatory also owns a variety of smaller scopes and a SBIG Spectrograph. The spectrograph has been used to catalog bright solar spectrum as part of an effort to create an online digital database for astrophysical research.