SAGITTARIUS II, DRACO II AND LAEVENS 3: THREE NEW MILKY WAY SATELLITES DISCOVERED IN THE PAN-STARRS 1 3<i>π</i>SURVEY

Abstract

We present the discovery of three new Milky Way satellites from our search for compact stellar overdensities in the photometric catalog of the Panoramic Survey Telescope and Rapid Response System 1 (Pan-STARRS 1, or PS1) 3 survey. The first satellite, Laevens 3, is located at a heliocentric distance of d = 67 3 kpc. With a total magnitude of M V = -4.4 0.3 and a half-light radius of r h = 7 2 pc, its properties resemble those of outer halo globular clusters. The second system, Draco II/Laevens 4, is a closer and fainter satellite (d 20 kpc, M V = -2.9 0.8), whose uncertain size (r 19 pc