The Palomar Clusters were discovered by some of the most famous astronomers of our time including Edwin Hubble, Walter Baade, Fritz Zwicky, Halton Arp and George Abell. They were catalogued by George Abell but naming them Palomar should probably be credited to Helen Sawyer Hogg. The initial list included just 13 clusters with Pal 14 and Pal 15 added later. The reason for their relatively late discovery is that they are very faint due to being either heavily obscured, extremely remote or having few remaining stars. It took the giant 48-inch Schmidt camera at Palomar to discover them.Palomar 1 is a globular cluster in the constellation Cepheus in the halo possibly in the Outer Arm of the Milky Way galaxy. First discovered by George O. Abell in 1954 on the Palomar Survey Sky plates, it was catalogued as a globular cluster. At 8 billion years old, it is a very young cluster when compared to the other globular clusters in the Milky Way. It is a relatively metal-rich globular with [Fe/H] = -0.60. It is likely that Palomar 1 has a similar evolutionary history to the Sagittarius dwarf companion globular Terzan 7, that is, it may have once been associated with a dwarf spheroidal galaxy that was later destroyed by tidal forces.This image comprises 10 x Luminance (300 seconds each) and 5 x Red, Green and Blue (180, 187 and 156 seconds each), 0.5m f/2.9 ASA Astrograph with FLI ML3200 camera at an altitude of 35 degrees on 26 September 2017. The fields of view are 32’ x 21’ and 18' x 12', respectively.
Hills Observatory: 1 January 2013 to 30 March 2020