Degrading Orbit on my ScanSat

[iPat]

Launched my first ScanSat enabled satellite into a nice 120km polar orbit above Kerbin (KSP 1.0.5)

Then noticed that my periapsis is slowly dropping, on the order of .1-.2 m/s.

Why? Is this some sort of drag from extreme upper atmosphere? Does is have to do with Kerbin's movement around the sun? Is it a unique phenomenon only suffered by polar orbits? (Never noticed this on my space station.) Is it a bug?

Any ideas?

[Claw]

It's a precision issue inherent to the way floating numbers in computers work. Although generally orbits below 100km are less stable. (Yes, I see you are at 120km.) If you are waiting for the mapping, time warp also makes the orbit more stable.

[Aethon]

I'm not sure about this version, but previously any clipped parts will cause orbits to change in unexpected ways.

It's a shame. We have all these cool new editor tools to put parts where you need them to be, but I rarely use them because it can cause ships to fall from the sky..

BTW. Welcome to the Forums.

[Lohan2008]

/welcome