I've been doing more unmanned probe ships so I tried putting together a commnet around Kerbin to make sure I'd be able to control them. I launched all of these in an equilateral triangle at roughly 1.1Mm altitudes. My 3 satellites are orbiting at:
A: Ap 1,101,976m, Pe 1,097,961m
B: Ap 1,102,348m, Pe 1,098,289m
C: Ap 1,101,755m, Pe 1,097,829m
You might look at this and say "well B is a little more off than the others, it's probably the one that drifted from its place in the triangle". Nope. B is the topmost one.
You can't be
that specific in setting these orbits with the stock game, even setting rocket thrust to the lowest possible value and barely tapping shift, so I was hoping that at least if I got them close enough (certainly A/C-level close) they'd mostly be fine and maybe sliiiightly drift over the course of years, but it really didn't take that long to get pretty messed up.
Same thing on Minmus:
A: Ap 300,600m, Pe 299,896m
B: Ap 300,718m, Pe 299,975m
C: Ap 300,873m, Pe 299,482m
I launched these more recently so they're not that bad yet, but clearly trending that way. Part of the frustrating aspect was that even if I got my launching craft into a really stable and exact orbit to launch each satellite off of it, the decoupler has enough force that it makes an impact of hundreds of meters on the Ap/Pe of the satellite. So annoying