A New Faint Milky Way Satellite Discovered in the Pan-STARRS1 3 pi
  Survey
  We present the discovery of a faint Milky Way satellite, Laevens 2/Triangulum
II, found in the Panoramic Survey Telescope And Rapid Response System
(Pan-STARRS 1) 3 pi imaging data and confirmed with follow-up wide-field
photometry from the Large Binocular Cameras. The stellar system, with an
absolute magnitude of M_V=-1.8 +/-0.5, a heliocentric distance of 30 +2/-2 kpc,
and a half-mass radius of 34 +9/-8 pc, shows remarkable similarity to faint,
nearby, small satellites such as Willman 1, Segue 1, Segue 2, and Bo\"otes II.
The discovery of Laevens 2/Triangulum II further populates the region of
parameter space for which the boundary between dwarf galaxies and globular
clusters becomes tenuous. Follow-up spectroscopy will ultimately determine the
nature of this new satellite, whose spatial location hints at a possible
connection with the complex Triangulum-Andromeda stellar structures.
