15:25 <discord-> S​ir Mortimer. — I'm thinking that, for a vessel on an arbitrary trajectory within a resonable star system, when extrapolating positions for a duration of up to 3 hours into the future, principia and KSP will yield results that are *roughly* equal. Meaning that, while the exact position will naturally be different, the error accumulated in those 3 hours will not be big enough to matter when looking at attribu

15:25 <discord-> S​ir Mortimer. —

15:25 <discord-> S​ir Mortimer. — If that is true, the errors introduced by the different positions will be small enough so that Kerbalism can tolerate them while running the simulation.

15:25 <discord-> S​ir Mortimer. —

15:25 <discord-> S​ir Mortimer. — Kerbalism - not KC.

15:58 <discord-> S​tonesmile. — I guess the most extreme situation in RSS is when orbiting a small moon around a large main body (Phobos?) If one can do some numerical calculations on one of those examples you can get an estimation of what time is safe to use (Disclaimer; I'm not an expert in any of the fields this message has touched on 😅)

16:34 <discord-> M​ISSHON COMPREE. — I tried to orbit phobos yesterday and principia was not having it

16:35 <discord-> S​tonesmile. — Not being in a stable orbit isn't the question, the question is about the size of the orbital perturbations from the osculating orbit in a fixed time step

16:38 <discord-> M​ISSHON COMPREE. — can't help you there, I am still learning principia and not exactly an expert in orbital mechanics

16:43 <discord-> S​ir Mortimer. — I guess orbiting phobos is not a very hasty endeavour, so relative velocities will be fairly low and thus the 3 hour error relatively small

16:46 <discord-> S​tonesmile. — I guess the best thing is to have @egg weigh in

16:47 <raptop> Phobos has a smol SOI, right?

16:47 <raptop> Isn't Mars-Phobos L1 like 10 km above Stickney?

16:54 <raptop> Assuming I'm doing the math right, ~16.6 km from Phobos' center of mass (assume a spherical Phobos)

16:55 <raptop> And, uh, Phobos' mean radius is ~11 km

17:06 <discord-> S​ir Mortimer. — yeah that's going to be ... tight

17:08 <discord-> M​ISSHON COMPREE. — I tried a polar orbit at about 12km and i could do about half an orbit before my probe escaped, so i just ended up landing

17:10 <raptop> For maximum shenanigans, I bet you can't land at all on the innermost Jovian moons

17:13 <discord-> S​ir Mortimer. — why not?

17:13 <raptop> Amalthea in particular is suspected to be held together by mechanical strength, not gravity

17:13 <discord-> b​adgermasher. — They're right down around the Roche limit

17:13 <raptop> They're inside the liquid drop roche limit

17:14 <raptop> s/liquid drop/fluid/

17:14 <discord-> S​ir Mortimer. — they are??

17:14 <discord-> S​ir Mortimer. — how is that possible

17:15 <discord-> S​ir Mortimer. — wouldn't they disintegrate?

17:15 <raptop> they presumably have non-zero tensile strength. sort of like you

17:15 <discord-> b​adgermasher. — Just give Jupiter some time, I'm sure they're working on the issue.

17:15 <raptop> heh

17:26 <discord-> S​ir Mortimer. — 😇

17:27 <discord-> S​ir Mortimer. — so there probably is no dust on the inner moons

17:29 <raptop> it's probably in the rings

17:36 <discord-> b​adgermasher. — The inner moons of Jupiter are interesting. The innermost are buzzing around Jupiter at about the same speed as the Earth goes around the Sun.

17:38 <raptop> faster!