The Palomar Observatory is located in north San Diego County, California. It is a world-class center of astronomical research that is owned and operated by the California Institute of Technology. The observatory is home to five telescopes that are nightly used for a wide variety of astronomical research programs. The research is conducted by Caltech's faculty, post-doctoral fellows and students, and by researchers at Caltech's collaborating institutions. The 200-inch (5.1 m) Hale Telescope (f/3.3) was the world's largest effective telescope for 45 years (1948 - 1993). It is still a workhorse of modern astronomy. It is used nightly for a wide range of astronomical studies. On average the weather allows for at least some data collection about 290 nights a year.
Observatory postal address: 35899 Canfield Road, Palomar Mountain, CA 92060-0200
Observatory Office (on Caltech campus): (626) 395-4003
Main Office at Observatory: (760) 742-2100
Last updated or reviewed March 2, 2011.