What was the name of Cassini's final mission phase ending in Saturn?

Cassini's final mission phase ending in Saturn was called the Grand Finale. It began in April 2017, after a final close encounter with Titan redirected the spacecraft onto a daring path between Saturn and its innermost ring.

During the Grand Finale, Cassini completed 22 highly inclined orbits through the previously unexplored gap between the planet and the rings. These passes brought its instruments closer to Saturn than ever before, allowing scientists to study the planet's atmosphere, magnetic field, gravity, and ring system in unprecedented detail.

The mission ended on September 15, 2017, when Cassini was deliberately sent into Saturn's upper atmosphere. The controlled plunge prevented the aging spacecraft from accidentally colliding with potentially habitable moons such as Enceladus or Titan and contaminating them with Earth material.

Cassini had launched in 1997 and entered orbit around Saturn in 2004. Its 13-year Saturn tour transformed knowledge of the planet, its rings, and its moons. “Saturn Impact” describes the ending event, but Grand Finale is the official name of the broader final mission phase.