Credit: Optical HT Cas Image
Based on photographic data obtained using Oschin Schmidt Telescope on
Palomar Mountain. The Palomar Observatory Sky Survey was funded by the
National Geographic Society. The Oschin Schmidt Telescope is operated by
the California Institute of Technology and Palomar Observatory. The plates
were processed into the present compressed digital format with their
permission. The Digitized Sky Survey was produced at the Space Telescope
Science Institute (ST ScI) under U.S. Government grant NAG W-2166.