Given a current altitude, orbital velocity, and periapsis, we have enough information to resolve the orbit of the ship (there are some ambiguities in orientation, but they do not matter for this problem). The periapsis resulting in the desired orbit is then calculated. This is done by fixing the current altitude and velocity, and varying the periapsis of the orbit. This calculator searches for constant-velocity manoeuvers that, after aerobraking, result in an orbit with the desired apoapsis. If this happens, just re-run the calculator with the new orbit data to determine the required course correction.
Sometimes, when coming out of timewarp, the periapsis will jump around a bit, potentially messing up the aerobraking manoeuver. The calculator will probably not work for ships with lift surfaces, because the lift force depends on the craft's orientation in the atmosphere.
In some cases, if your periapsis is too deep within the planet's atmosphere, the calculator has trouble finding a solution. perpendicular to your direction of travel.)īefore running the calculator, adjust your orbit so that the periapsis is slightly above the atmosphere of the target body. The direction in which to thrust will always be directly between the prograde and retrograde markers (i.e. Note on the angles: Angles are measured from the top of the navball. Your orbital velocity should not significantly change. Point your craft at the angle given by the calculator and thrust until the orbit periapsis matches that given by the solution. The solution found by the calculator is in the form of an orbital manoeuver. The calculator will find a manoeuver to get you there. Then, enter the apoapsis distance you want after aerobraking. Enter your current altitude, orbital velocity, and periapsis distance into the calculator at right.
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