Palomar's Samuel Oschin 48-inch Telescope (IMAGE) California Institute of Technology Caption The Palomar Transient Factory survey uses the 48-inch Samuel Oschin telescope at Caltech's Palomar Observatory. Credit Palomar Observatory/Caltech Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.