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It isn’t much more than a tiny moving dot across a sea of stars, but on August 16, 2018 New Horizons was able to capture its first series of images of its January 1st fly-by target, the Kuiper belt object they have nicknamed Ultima Thule.
This first detection is important because the observations New Horizons makes of Ultima over the next four months will help the mission team refine the spacecraft’s course toward a closest approach to Ultima, at 12:33 a.m. EST on Jan. 1, 2019. That Ultima was where mission scientists expected it to be – in precisely the spot they predicted, using data gathered by the Hubble Space Telescope – indicates the team already has a good idea of Ultima’s orbit.
Ultima was 100 million miles away at the time.