[Ground-station] GMAT vs. STK/HPOP - call for help

[Michelle Thompson]

For the Debris Mitigation presentation to the FCC, we want to give answers
(and show our work) about how much delta-v we need for some of the proposed
orbits for minimum viable amateur spacecraft in the Amateur Radio Satellite
Service.

There's a question that Jan King and I have about a critical altitude and
low surface_area:mass ratio spacecraft. It occurred to us that we really
might want to compare results across two or more software packages to build
some confidence.

Jan has a set of results from a spreadsheet from SMAD.

https://smad.com/

The calculation under review is around 165km with a relatively lightweight
6U spacecraft. It's acting like it wants to do some strange things. Is this
physics, or at a limit of the model?

We have a couple of people who are good or are getting good at GMAT.

https://software.nasa.gov/software/GSC-17177-1

Question: Are the atmospheric models in GMAT good enough for this
calculation?

Does anyone have access to STK/HPOP to run this calculation, for
comparison?

https://www.agi.com/products/stk

https://help.agi.com/stk/11.0.1/Content/hpop/hpop.htm

Thank you,
-Michelle W5NYV
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