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Author Topic: interplanetary rendezvous  (Read 4935 times)

pclaurent

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interplanetary rendezvous
« on: January 14, 2018, 03:40:25 PM »
[v. 1.0.8 Android]
A real interplanetary trip planner would be really appreciated. For now, we just have the "@APO" feature which is not bad but... Let's imagine an initial plan (typically a Hohmann transfer) from earth to, let's say, mars... if the initial "@APSIS Mars" position matched with our apoaxis (which is what we expect for a Hohmann transfer), the real position of mars will be somehow different once we effectively reach apoaxis (probably due to gravitational interferences from other solar system bodies). So we need to correct our trajectory on the go.

The problem is that we cannot test on-flight correction burns (at mid-course for instance). If we click on @APO once again during the travel, the new "@APSIS Mars" position will be completely different from the initial one (why?). The only "dirty solution" is then to try some corrective burns (especially in radial direction) and see what happens, by using small orbit segment at a time.

A far better solution would be either to correct the @APO functionality to produce a proper position when used during the flight or, even better, to change the @APO feature by another one, like @PRO which would calculate the position of the target (mars) when we will occupy the closest position to it on our predicted orbit (the one we simulate). This way we could easily plan an orbit passing in the vicinity of the target. And this closest position will not necessarily be our apoaxis…

 

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