We present the discovery of activity emanating from main-belt asteroid 2015
FW412, a finding stemming from the Citizen Science project Active Asteroids, a
NASA Partner program. We identified a pronounced tail originating from 2015
FW412 and oriented in the anti-motion direction in archival Blanco 4-m (Cerro
Tololo Inter-American Observatory, Chile) Dark Energy Camera (DECam) images
from UT 2015 April 13, 18, 19, 21 and 22. Activity occurred near perihelion,
consistent with the main-belt comets (MBCs), an active asteroid subset known
for sublimation-driven activity in the main asteroid belt; thus 2015 FW412 is a
candidate MBC. We did not detect activity on UT 2021 December 12 using the
Inamori-Magellan Areal Camera and Spectrograph (IMACS) on the 6.5 m Baade
telescope, when 2015 FW412 was near aphelion.Comment: 4 pages, 1 figur