Cometary Activity on Quasi-Hilda Object 2018 CZ16

Abstract We present the discovery of activity originating from quasi-Hilda Object 2018 CZ 16 , a finding stemming from the Citizen Science project Active Asteroids . For 2018 CZ 16 we identified a broad (∼60°) but short (∼5″) tail in archival Blanco 4 m data from Cerro Tololo Inter-American Observatory, Chile, (CTIO) Dark Energy Camera images from UT 2018 May 15, 17 and 18. Activity occurred 2 months prior to perihelion, consistent with sublimation-driven activity.