Recently very low Earth orbit (VLEO) below 450km has become popular for individual
spacecraft missions and large spacecraft constellations due to several mission benefits such …

This study focuses on utilizing the increasing availability of satellite trajectory data from
global navigation satellite system-enabled low-Earth orbiting satellites and their precision …

Precise non-gravitational satellite force models are crucial for various space-based
applications, thus contributing to a better understanding of the Earth system. Satellite orbits …

Space vehicles orbiting in Very-Low-Earth-Orbit (VLEO, h= 200∼ 300 km) experience
considerably large aerodynamic drag due to high air-density in comparison with Low-Earth …

THE IMPACT project (Fig. 1), funded by an internal research and development process at
Los Alamos National Laboratory (LANL), has the goal to develop an integrated modeling …

A quantized, volume-based approach to representing geometry in direct simulation Monte
Carlo (DSMC) simulations is presented, and its implementation in a reference code is …

An accurate estimation of upper atmospheric densities is crucial for precise orbit
determination and prediction of low Earth orbit (LEO) satellites as well as scientific studies of …

Detailed rarefied aerodynamics are usually not coupled with the rigid-body dynamics of
spacecraft. In part because of computational constraints, simpler models based upon the …

Thousands of satellites and debris reside in the thermosphere. The ability to model
atmospheric drag is critical for precise satellite orbit prediction below 1000 km altitudes. The …