Working Paper Hypothesis Version 1 This version is not peer-reviewed

An Alternative Explanation of the Rapid Orbital Expansion of Titan

Version 1 : Received: 11 September 2021 / Approved: 13 September 2021 / Online: 13 September 2021 (10:53:54 CEST)

How to cite: Křížek, M.; Gueorguiev, V.G.; Maeder, A. An Alternative Explanation of the Rapid Orbital Expansion of Titan. Preprints 2021, 2021090200 Křížek, M.; Gueorguiev, V.G.; Maeder, A. An Alternative Explanation of the Rapid Orbital Expansion of Titan. Preprints 2021, 2021090200

Abstract

Recently it was found from Cassini data that the mean recession speed of Titan from Saturn is v = 11.3 ± 2.0 cm/yr which corresponds to a tidal quality factor of Saturn Q = 100 while the standard estimate yields Q ≥ 6 · 104 . It was assumed that such a large speed v is due to a resonance locking mechanism of five inner mid-sized moons of Saturn. In this paper, we show that an essential part of v may come from a local Hubble expansion. Namely, we show that the Hubble-Lemaître constant H0 recalculated to the Saturn-Titan distance D is 8.15 cm/(yr D). Our hypothesis is based on many other observations showing a slight expansion of the Solar system and also of our Galaxy at a rate comparable with H0. We demonstrate that the large disproportion in estimating the Q factor can be just caused by the local expansion effect.

Keywords

local Hubble expansion; Solar system; Titan; laws of conservation of energy and angular momentum

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