M1
100%
The study-critical subset. Everything the six scenarios of the ESPF validation pre-registration require, plus the validation and performance evidence for it. This is the only hard gate on Stage 4.
M2
0%
General-purpose completion. Not a Stage 4 gate. Higher-degree gravity fields, additional density models, box-wing SRP, eclipse modeling, impulsive and finite burns, STM and covariance propagation, relative motion, TLE and CCSDS TDM I/O.