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Mars moon ephemerides after 14 years of Mars Express data
Jaumann, R.; Oberst, J.; Rosenblatt, P. +7 more
The Mars Express (MEX) mission has been successfully operated around Mars since 2004. Among many results, MEX has provided some of the most accurate astrometric data of the two Mars moons, Phobos and Deimos. We present new ephemerides of the Mars moons benefitting from all previously published astrometric data to the most recent MEX SRC data. Obse…
A lighter core for Phobos?
Li, Fei; Pätzold, Martin; Yan, Jianguo +7 more
Context. The origin of the Martian moons Phobos and Deimos is still poorly understood, and is the focus of intense debate.
Aims: We demonstrate that a stratified internal structure of Phobos is compatible with the observed gravity coefficients.
Methods: We fit previously derived C20 and C22 Phobos gravity coefficien…
Galactic cosmic ray modulation at Mars and beyond measured with EDACs on Mars Express and Rosetta
Johnstone, A.; Lester, M.; Wimmer-Schweingruber, R. F. +5 more
Galactic cosmic rays (GCRs) are an intrinsic part of the heliospheric radiation environment and an inevitable challenge to long-term space exploration. Here we show solar-cycle-induced GCR modulation at Mars in the period 2005-2020, along with GCR radial gradients, by comparing Mars Express and Rosetta engineering parameters to sunspot number time…