New Horizons principal investigator Alan Stern of the Southwest Research Institute (SwRI), Boulder, CO, left, New Horizons project manager Helene Winters of the Johns Hopkins University Applied Physics Laboratory, second from left, Fred Pelletier, lead of the project navigation team at KinetX Inc. in Simi Valley, California, second from right, and New Horizons co-investigator John Spencer of the Southwest Research Institute (SwRI), Boulder, CO, right, are seen during a press conference prior to the flyby of Ultima Thule by the New Horizons spacecraft, Monday, Dec. 31, 2018 at Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Maryland. Photo Credit: (NASA/Joel Kowsky)