• The mission team called it a “stretch goal” – just before closest approach, precisely pointing the cameras on NASA’s New Horizons spacecraft to snap the sharpest possible pictures of the Kuiper Belt object nicknamed Ultima Thule, its New Year’s flyby target and the farthest object ever explored.
  • Now that New Horizons has sent those stored flyby images back to Earth, the team can enthusiastically confirm that its ambitious goal was met.
  • These new images of Ultima Thule – obtained by the telephoto Long-Range Reconnaissance Imager (LORRI) just six-and-a-half minutes before New Horizons’ closest approach to the object (officially named 2014 MU69) at 12:33 a.m. EST on Jan. 1, 2019 – offer a resolution of about 110 feet (33 meters) per pixel.
  • Their combination of high spatial resolution and a favorable viewing angle gives the team an unprecedented opportunity to investigate the surface, as well as the origin and evolution, of Ultima Thule, which is thought to be the most primitive object ever encountered by a spacecraft.
  • Getting these images required us to know precisely where both tiny Ultima and New Horizons were — moment by moment – as they passed one another at over 32,000 miles per hour in the dim light of the Kuiper Belt, a billion miles beyond Pluto.
  • This was a much tougher observation than anything we had attempted in our 2015 Pluto flyby.
  • These ‘stretch goal’ observations were risky, because there was a real chance we’d only get part or even none of Ultima in the camera’s narrow field of view.
  • “But the science, operations and navigation teams nailed it, and the result is a field day for our science team! Some of the details we now see on Ultima Thule’s surface are unlike any object ever explored before.
  • The higher resolution brings out a many surface features that weren’t readily apparent in earlier images.
  • Among them are several bjustify, enigmatic, roughly circular patches of terrain. In addition, many small, dark pits near the terminator (the boundary between the sunlit and dark sides of the body) are better resolved.
  • Swooping within just 2,200 miles (3,500 kilometers), New Horizons flew approximately three times closer to Ultima than it zipped past its primary mission target, Pluto, in July 2015.
  • Ultima is a smaller object than Pluto, but the Ultima flyby was done with the highest navigation precision ever achieved by any spacecraft before.
  • This unprecedented precision was achieved thanks to the ground-based occultation campaigns from 2017 and 2018 conducted in Argentina, Senegal, South Africa and Colombia, as well as the European Space Agency’s Gaia mission, which provided the locations of the stars that were used during the occultation campaigns.