An 11 metre asteroid called 1998 KY26 is accelerating in an unusual way, with out of plane non gravitational acceleration and a spin of once every 5.35 minutes. One leading theory called it a hidden dark comet using escaping gas to propel itself. New research in Icarus by Korbin Hansen and Masatoshi Hirabayashi shows KY26 is too warm to retain the ice needed for that process. So what is pushing it?