4 ms·
> It's about 1.7km/s delta-v to land on the moon from LLO. Looking at it from LLO isn't the number you should be using. It's the number from Lunar intercept or
by mlindner 4y ago
> It's about 1.7km/s delta-v to land on the moon from LLO.
Looking at it from LLO isn't the number you should be using. It's the number from Lunar intercept orbits to landing.
- CuriousCosmic 4y agoI was just illustrating the path along the lunar gateway (LEO -> TLI -> Gateway -> LLO -> surface). Even if you do a direct (LEO -> TLI -> LLO -> surface) route, you still have to go through LLO as you'll need to be able to pick your landing spot and potentially even delay a landing (which is not possible if LLO is not budgeted in). Actually now that I think about it, if you want to save delta-v, you can get an extra 25% off the TLI leg of the direct route with a low energy transfer using weak stability boundary trajectories. These savings however come at the cost of a significantly longer flight time and far slimmer margins for failure.