Webb Reveals Secrets of Neptune's Evolution

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Webb Reveals Secrets of Neptune's Evolution
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JWST observations of icy bodies in the Kuiper Belt may provide a clue to their histories and that of the ice giant planet Neptune.

JWST's view of Neptune in infrared. The telescope also studied the surfaces of two icy asteroids in the Kuiper Belt that lie beyond Neptune. Courtesy: NASA, ESA, CSA, STScI

Why is there such a varied bunch of objects “out there”? Where did they originate and how have they changed over time? One way to answer those questions is to study the surface properties of Kuiper Belt Objects and, in particular, icy rocks like Mors-Somnus. One way to do that is to take spectra of their surfaces. The data reveals information about the surface compositions of these objects.

The Mors-Somnus is a member of the same dynamical group as other nearby TNOs and they share spectroscopic characteristics with other cold-classical group objects. This means they probably all formed at about the same time. They probably originated beyond 30 astronomical units from the Sun. Trans-Neptunian binaries such as Mors-Somnus provide a unique way to look at the formation and evolution of planetesimals in that region of space.

A model of possible migration paths in the outer solar system due to giant planet migrations. Model: R. Gomes, image by Morbidelli and Levison.

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