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We present archival observations of Main-belt asteroid (248370) 2005 QN173(also designated 433P) that demonstrate this recently discovered activeasteroid (a body with a dynamically asteroidal orbit displaying a tail or coma)has had at least one additional apparition of activity near perihelion during aprior orbit. We discovered evidence of this second activity epoch in an imagecaptured 2016 July 22 with the Dark Energy Camera on the 4 meter Blancotelescope at the Cerro Tololo Inter-American Observatory in Chile. As of thiswriting, (248370) 2005 QN173 is just the 8th active asteroid demonstrated toundergo recurrent activity near perihelion. Our analyses demonstrate (248370)2005 QN173 is likely a member of the active asteroid subset known as Main-BeltComets, a group of objects that orbit in the Main Asteroid Belt which exhibitactivity that is specifically driven by sublimation. We implement an activitydetection technique, "wedge photometry," that has the potential to detect tailsin images of solar system objects and quantify their agreement with computedanti-solar and anti-motion vectors normally associated with observed taildirections. We present a catalog and an image gallery of archival observations.The object will soon become unobservable as it passes behind the Sun as seenfrom Earth, and when it again becomes visible (late-2022) it will be fartherthan 3 au from the Sun. Our findings suggest (248370) 2005 QN173 is most activeinterior to 2.7 au (0.3 au from perihelion), so we encourage the community toobserve and study this special object before December 2021.

Recurrent Activity from Active Asteroid (248370) 2005 QN173: A Main-Belt Comet