Testing of citizen scientist discovery suggests it is on the boundary between comet and asteroid
Images of 2009 DQ118 (green dashed arrows) displaying a cometary tail (white arrows). Frames (a) and (b) are from the first activity epoch and resulted from our Active Asteroids citizen scientist project and archival search. Frame (c) is an APO follow-up image showing faint signs of activity resulting in the tentative discovery of the second epoch of activity. In frames (a) through (c), the negative heliocentric velocity (black arrow outlined in red) and antisolar (yellow arrow) directions projected to the on-sky plane…
