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6 votes

Starship reentry velocity on return from Mars: What are the options

Starship's limited $\Delta V$ means that it can't stray too far from minimum energy transfers. 100t payload + 120t dry mass + 1200t of propellant + 380s $I_{sp}$ $\to$ ~$6900m/s$, turns out this wasn'...
BrendanLuke15's user avatar
5 votes

How can you calculate a Hohmann transfer orbit but ending at the same orbit with a time difference between orbits?

Looks like you want a two-impulse phasing manoeuvre, first lifting your apoapsis with a burn, then going one or more orbits around, and then lower the apoapsis back down. The orbital period can be ...
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