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doc: update todo

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ktyl 2024-09-28 16:15:02 +01:00
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@ -37,3 +37,10 @@ Now we set the true anomaly when setting the particle velocity. However, the par
We need to calculate the particle's position as a function of the absolute time AND the specific particle's true anomaly at t=0. We need to update the latter when we modify the orbit.
We actually want to calculate the particle's mean anomaly at epoch when we update orbital parameters. This is because it is the mean anomaly which is computed as a function of time. When we update the orbital parameters, we can compute the mean anomly from the true anomaly on both occasions, which gives us the different in the mean anomaly at epoch before and after the update.
Argument of Periapsis
Hypothesis: The shifting in position is caused by a the change in the argument of periapsis which is not accounted for when updating the orbit
Test: Update the velocity such that the apo- and periapses of the orbit swap sides. This would cause the particle to jump to the other side of the planet
Test: Position the particle exactly at the apo- or periapsis before updating the velocity. The particle should remain stationary.