SPACEWATCH® Observes Light Curve of Near-Earth Asteroid (66391) 1999 KW4

Near-Earth Asteroid (66391) 1999 KW4 Observing Campaign in 2019:   SPACEWATCH® contributed photometric time series observations in May and June 2019 to help refine knowledge of this binary asteroid that made a close approach to Earth in May 2019.  The purpose of this international study was to practice against the prospect of an imminent impact by an asteroid that might be discovered in the future.