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Probing Haumea’s Interior Through Non-Keplerian Orbit Fitting

Presentation #202.06 in the session TNO Theory and Physical Properties (Oral Presentation)

Published onOct 23, 2023
Probing Haumea’s Interior Through Non-Keplerian Orbit Fitting

The dwarf planet Haumea is one of the most intriguing objects in the solar system. Haumea is host to a ring, two satellites, and a collisional family. Although the surfaces of these bodies have been studied in some detail, the interior of Haumea is still poorly understood. Occultations of Haumea have shown that its triaxial shape is inconsistent with a homogeneous body in hydrostatic equilibrium. However, this may be explained by a large rocky core within Haumea. Unfortunately, thus far, only Haumea’s bulk density and shape has informed interior models. Now, however, with two decades of ultra-precise HST and AO observations of Haumea’s satellites, we are able to place constraints on Haumea’s interior. Through non-Keplerian orbit fitting of Haumea’s satellites, we have been able to precisely measure Haumea’s gravitational harmonics and spin pole. Here, we present our new orbital model and discuss its implications for our understanding of Haumea’s interior.

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