Andromeda XIX is a satellite galaxy of the Andromeda Galaxy (M31), a member of the Local Group, like the Milky Way Galaxy.[2] Andromeda XIX is considered "the most extended dwarf galaxy known in the Local Group",[3] and has been shown to have a half-light radius of 1.7 kiloparsec (kpc).[3] It was discovered by the Canada–France–Hawaii Telescope, and is thought to be a dwarf galaxy.
Surveillance performed during use of the MegaPrime/MegaCam 1 deg2 (camera) on the Canada-France-Hawaii Telescope (CFHT) had mapped the Andromeda Galaxy's stellar halo (one quarter) up to ~150 kpc.[4] The survey, which had confirmed the clumpiness of Andromeda's stellar halo, had shown the existence of multiple other dwarf galaxies.[4] They include: AndromedaXI, XII, XIII, XV, XVI, XVIII, XIX, and XX.[4]
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