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A Voyage into Unique Territory: Cassini's Grand Finale

Brief Abstract: Key science findings acquired during Cassini’s unique dives between the rings and Saturn (Grand Finale), and during its Ring Grazing orbits are presented. Introduction: After more than 13 years in orbit around Saturn, the Cassini-Huygens mission ended in a science-rich blaze of glory on September 15, 2017. The Grand Finale and Ring Grazing orbits marked the final phase of Cassini’s mission covering a period of roughly ten months and ending the mission with the first time in-situ exploration of the region between the rings and planet. On its final orbit, Cassini plunged into Saturn’s atmosphere, vaporizing and satisfying planetary protection requirements, while sending back its final bits of unique science data. Cassini’s End of Mission: Ring Grazing Orbits. In late 2016, Cassini’s trajectory transitioned to a series of 20 Ring Grazing orbits with peripases located within 10000 km of Saturn’s F ring (Figure 1). These orbits provided the high-resolution views of Saturn’s F ring and outer A ring, and prime viewing conditions for fine scale ring structures such as propellers (Figure 2). They also included the closest flybys of tiny ring moons, including Pan, Daphnis and Atlas (Figure 2). Plasma and dust composition measurements were also conducted in this region.