Lowest Kerbin orbit possible

[Pat20999]

Orbit Kerbin the lowest altitude possible before the end of the year lol, the winner wins.

[Vanamonde]

The lowest possible orbit of Kerbin is set by the height of the atmosphere. At or below 70kms from sea level your craft will be slowed by passing through air and sooner or later de-orbit. Anything even slightly over 70kms will orbit indefinitely, or at least until slight round-off errors in the game's math build up enough to either enter atmo or leave Kerbin's SOI. 

[Toaster355]

17 hours ago, Pat20999 said:

Orbit Kerbin the lowest altitude possible before the end of the year lol, the winner wins.

Like, a stable orbit?
Or orbiting Kerbin as low as possible at least once without any engine power?
If so, I'm pretty sure this has already been achieved and has yet to be beaten: 

 

[Vanamonde]

Passing through atmo without de-orbiting, you mean? 

[Pat20999]

4 hours ago, Toaster355 said:

Like, a stable orbit?
Or orbiting Kerbin as low as possible at least once without any engine power?
If so, I'm pretty sure this has already been achieved and has yet to be beaten: 

 

I ksp2 cuz it’s broken lol