2017 FO161

 is a large trans-Neptunian object from the scattered disc located in the outermost region of the Solar System. It is estimated to measure approximately 600 km in diameter and currently orbits at a distance of about 78.5 AU from the Sun. The object was first observed by American astronomers Chad Trujillo and Scott Sheppard using the 4-meter Víctor M. Blanco Telescope at the Cerro Tololo Inter-American Observatory in Chile on 23 March 2017. Precovery observations were made by the Pan-STARRS-1 survey at Haleakalā Observatory and by the Dark Energy Survey with DECam, dating back as far as March 2012 and January 2016, respectively.