Non-gravitational force model vs observation: the trajectory and rotation-axis of comet 67P/Churyumov-Gerasimenko

  • The determination of non-gravitational forces based on precise astrometry is one of the main tools to establish the cometary character of interstellar and solar-system objects. The Rosetta mission to comet 67P/C-G provided the unique opportunity to benchmark Earth-bound estimates of non-gravitational forces with in-situ data. We determine the accuracy of the standard Marsden and Sekanina parametrization of non-gravitational forces with respect to the observed dynamics. Additionally we analyse the rotation-axis changes (orientation and period) of 67P/C-G. This comparison provides a reference case for future cometary missions and sublimation models for non-gravitational forces.
Author:Tobias KramerORCiD, Matthias LäuterORCiD
Document Type:In Proceedings
Parent Title (English):Europlanet Science Congress
First Page:EPSC2020-403
Publisher:Europlanet Science Congress
Year of first publication:2020
Published in:Europlanet Science Congress