Eve - aerobraking into a low orbit...

[kerbonaut101]

What altitude should I set my periapsis to, to get into a low 120km orbit around Eve?

[Johnno]

Depends entirely on your entry speed.

Try this: http://alterbaron.github.io/ksp_aerocalc/

[SolarLiner]

For this, you'll need MechJeb and its Landing Guidance window. I know it's a bit confusing, but from here you will activate the "Show aerobrake node", which simply shows you ... your predicted orbit after aerobraking ! So you fire retrograde until the node show a good orbit for you.

But it's not all ! While in the atmosphere, since you have nothing else to do, you can plot a maneuver node in the current node and plan a circularisation. Once this maneuver done, congrats, you're in orbit around Eve !

[Tiron]

For this, you'll need MechJeb and its Landing Guidance window. I know it's a bit confusing, but from here you will activate the "Show aerobrake node", which simply shows you ... your predicted orbit after aerobraking ! So you fire retrograde until the node show a good orbit for you.

But it's not all ! While in the atmosphere, since you have nothing else to do, you can plot a maneuver node in the current node and plan a circularisation. Once this maneuver done, congrats, you're in orbit around Eve !

Actually, the 'show aerobrake node' option causes it to set up a maneuver node for the aerobrake, which is slightly silly, but has uses in planning a post-aerobraking maneuver to go off automatically.

What you ACTUALLY want is to hit 'Show Landing Prediction', which activates the re-entry prediction algorithm. Which will calculate your landing site after re-entry...or your orbit after aerobraking if your predicted apoapsis will be out of the atmosphere. If it says 'Re-Entry Simulation Timed out', you're re-entering, but on a particularly shallow trajectory that nearly-but-not-quite climbs back out of the atmosphere.