CardboardSoyuz t1_jaa2by2 wrote
I agree Callisto has promise but the delta-V to get to the surface of Callisto from LEO is like 28 kps, and the delta V to get to the surface of Mars is about 10 kps and Callisto is no help with the aerobraking.
Shrike99 t1_jabbz5s wrote
Where'd you get 28km/s?
My handy dandy Delta-V map says LEO to Callisto's surface is only ~14.2km/s. I know Delta-V maps aren't super accurate but I find it hard to believe it's that wrong.
For reference, the map also puts LEO to Mars surface at 9.5km/s, which is within a reasonable margin of error of 10km/s.
Reddit-runner t1_jacl8ss wrote
>the map also puts LEO to Mars surface at 9.5km/s,
And that's only if you pretend aerobraking doesn't exist.
With aerobraking it's only 5km/s max. Including landing.
CardboardSoyuz t1_jaemcjg wrote
I used one of those rando London Underground subway style delta v charts -- my readers weren't handy -- and I think I grabbed the delta-v to Jupiter low orbit in there. My bad! I see from this one at 13.54 and Mars at 9.5 (I was doing the sums in my head too).
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