NASA's New Horizons Spacecraft Encounter with Kuiper Belt Object 2014 MU69

The New Horizons spacecraft flew-by Kuiper Belt object 2014 MU₆₉ on New Year's day 2019. Nicknamed "Ultima Thule" by the mission team, the icy body is the farthest object in the solar system that humans have yet encountered.

Kuiper Belt object 2014 MU69, "Ultma Thule" imaged by the New Horizons spacecraft on Jan. 1, 2019. Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute

It was known that 2014 MU₆₉ was elongated or lobe-shaped from star occultation observations made from Earth - the flyby confirmed that the object is a "contact binary" consisting of two connected spheres.

The colored lines mark the path of a star as seen from different telescopes on each day; the blank spaces on those lines indicate the few seconds when MU69 blocked the light from the star. Credit: NASA / JHUAPL / SwRI / James Tuttle Keane

The team says that the two spheres likely joined as early as 99 percent of the way back to the formation of the solar system, colliding no faster than two cars in a fender-bender.

Much higher resolution images are yet to come, as data from the spacecraft continues to arrive over the next several weeks.

I got to wondering what would happen to 2014 MU₆₉ if it orbited much closer to the Sun - would it end up looking like comet 67P/Churyumov–Gerasimenko?

Bilobed comet 67P/Churyumov–Gerasimenko. Images taken by Rosetta spacecraft on August 12, 2015. Credit: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

So, I asked on Twitter:

Interesting that 2014 MU69 is so obviously two bodies that stuck together - one has to wonder if it would end up looking like 67P/C-G if it was close enough to the Sun to outgas? One also wonders why we haven't spotted any tri-lobed objects? @specolations @hbhammel @MrBeamJockey https://t.co/ymVtQtXfTA

— Balrog's Lair (@BalrogsLair) January 3, 2019

Other Interesting Tweets:

Preliminary geology - albedo variations, no obvious craters yet, hills & ridges (?)... much better data will eventually be downloaded. pic.twitter.com/BJlshLisxK

— Dr Heidi B. Hammel (@hbhammel) January 2, 2019

Graduate student and New Horizons team member Mallory Kinczyk holding the model of Ultima Thule she made this morning -- remarkable! #UltimaThule #UltimaFlyby #NewHorizons pic.twitter.com/sL76na88qx

— David Eicher (@deicherstar) January 2, 2019

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NASA’s New Horizons Spacecraft Encounter with Kuiper Belt Object 2014 MU69

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