OCEANUS

[2][1] The concept was developed in a different form by the astronautical engineering students of Purdue University during the 2017 NASA/JPL Planetary Science Summer School.

The little data available on Uranus, an ice giant planet, come from ground-based observations and the single flyby of the Voyager 2 spacecraft, so its exact composition and structure are essentially unknown, as are its internal heat flux, and the causes of its unique magnetic fields and extreme axial tilt or obliquity,[1] making it a compelling target for exploration according to the Planetary Science Decadal Survey.

[2][4] The primary science objectives of OCEANUS are to study Uranus' interior structure, magnetosphere, and the Uranian atmosphere.

The trajectory to Uranus would require a Jupiter gravity assist, but such alignments are calculated to be rare in the 2020s and 2030s, so the launch windows will be scant and narrow.

[1] Alternatively, the SLS rocket could be used for a shorter cruise time,[8] but it would result in a faster approach velocity, making orbit insertion more challenging, especially since the density of Uranus' atmosphere is unknown to plan for safe aerobraking.

Atlas V, proposed for OCEANUS, shown here launching the Lunar Reconnaissance Orbiter into space
Schematic of the OCEANUS probe