Matthew is part of the SWIMMR (Space Weather Instrumentation, Measurement, Modelling, and Risk) project. He is deriving thermospheric densities from orbital data to provide a timely, global neutral density dataset for assimilation into AENeAS. Also increasing the maximum height of thermospheric models to altitudes above 500 km. This will allow for more accurate orbital propagation for a larger number of satellites, improving collision avoidance assessments and avoiding unnecessary manoeuvres.