Atmospheric Entry Studies for Uranus

To better understand the technology requirements for a Uranus atmospheric entry probe, an internal NASA study was conducted. The main objectives for this study were: (1) to determine the entry trade space through parametric studies; and (2) to identify entry technologies that could be used to enable a mission that would meet at least the Tier 1 science objectives described in the Decadal Survey. The paper describes two different approaches to the planet: 1) direct ballistic entry 2) aerocapture followed by direct entry of probe. For direct ballistic entry the trajectory analyses were performed for a range of entry flight path angles and ballistic coefficients. The larger size probes was also considered in an attempt to enable Tier 2 science objectives. For aerocapture analysis a single case was studied to demonstrate feasibility and benefits with this option. A summary of all of the above analyses, including factors that constrain allowable entry trajectories, is presented