Modeling of Fast Tumbling
Fast tumbling is when the spacecraft is rotating about all of its axes sufficiently rapidly (as can happen during preoperational stages) such that the heat loads can be averaged over all surfaces. In this case, the heat loads applied to the surfaces is approximated to:
where Famb is the view factor to ambient of all spacecraft surfaces, qsolar is the solar flux defined in the Sun Properties feature and qp is the sum of the planet IR flux and albedo on each radiation source over the spherical cap as defined in Modeling the Planet. n is the total number of radiation sources.