12:30 PM - 12:45 PM
[PPS05-16] Scientific significance of sample return from Martian moons
Keywords:Mars, Satelite, Phobos, Deimos, Sample return
Sample return missions to primitive small bodies such as main belt asteroids, Jovian Trojan asteroids, icy satellites, and comets require a timescale of decades, and it is important to plan short-term exploration missions to primitive bodies. Here we propose a sample return mission to Martian moons (Phobos and Deimos), of which characteristics resemble those of C-type or D-type asteroids. If they are captured main-belt asteroids, their surfaces have not been heated as much as near-Earth asteroids are. Martian moons are thus likely to preserve more primitive materials such as ice, which is one of possible constituents responsible for their low bulk-densities. If they are remnants of building blocks of Mars, the returned samples will provide us the first and direct information on the formation of Mars, the bulk chemistry of Mars, and the isotopic compositions of volatile elements as a starting point of Martian environmental evolution. Isotopic compositions of returned samples will be a key to address this issue on the origin of Martian moons. Surface regolith of Martian moons may contain ejecta from the Martian surface and/or the escaped Martian atmosphere, and the returned samples may enable us to put constraints on the crustal and environmental evolution of Mars. The remote-sensing observation of Martian atmosphere and surface from the spacecraft can also be done from the spacecraft. In this presentation, we will describe the outline and scientific rationales of the sample return mission from Martian moons.