OSIRIS-REx Particle Events and Juno Extended

TAKAHASHI,Yu（高橋 雄宇）
NASA Jet Propulsion Laboratory

This talk is going to be a two-part talk. The first part of the talk will be on the particles events we observed at Bennu. OSIRIS-REx arrived at asteroid Bennu in December 2018. During the first orbit campaign (Orbit-A), we observed many small ejecta launching off of the surface of Bennu. The characteristic of the particles' orbits could potentially jeopardize the spacecraft safety and it quickly became important to re-evaluate the mission architecture. One of the most important aspects of these particle events is that they proved very fortuitous for the radio science team in charge of gravity estimation. Their closer range to the surface proved very effective in estimating higher degree and order spherical harmonics coefficients that otherwise wouldn't have been possible from the spacecraft-only measurements. The second part of the talk will be on Juno extended mission. Juno arrived at Jupiter in July 2016 and has completed 30 science orbits as of January 2021. We have recently been granted an extended mission that will involve flybys of the three Galilean moons: Ganymede, Europa, and Io. The Ganymede flyby will occur in June 2021, Europa flyby in September 2022, and two back-to-back Io flybys in late 2023 and early 2024. Each flyby reduces the orbital period, eventually shrinking it from current 53 days to 33 days. We will discuss the challenges of the flybys we faced in the planning phase.

Via Zoom / zoom 開催