Flight Apoapsis and Periapsis are being raised while flying through uppermost part of atmosphere

[BigBA]

Reported Version: v0.2.1 (latest) | Mods: none | Can replicate without mods? Yes 
OS: Windows 11 | CPU: Fast CPU | GPU: RTX 3700 Mobile | RAM: 16 gb

 

Hey there,

a bug which I encountered several times is that my apoapsis and periapsis are being raised while flying through the atmosphere.

Dunno if it already has been reported.

 

Included Attachments:

KerbalSpaceProgram22024-02-0316-43-04.mp4

Atmosphere-SciencetoJoul.json

quicksave_1.json

Edited February 3 by Spicat

[Anonymous Bug Reporter]

Reported Version: v0.2.1 (latest) | Mods: none | Can replicate without mods? Yes 
OS: 6.7.2-arch1-2 | CPU: AMD Ryzen 5 5600X 6-Core Processor | GPU: AMD AMD Radeon RX 6600 | RAM: 32006 Mb

Being in a circular orbit in high Duna atmosphere is increasing my Periapsis/Apoapsis.

Create a simple craft (MK1 command pod, FLT-100 fuel tank, 48-7S "Spark" engine). Launch. Use the cheat menu to get into low orbit of Duna. Lower your orbit into Duna's atmosphere (Periapsis & Apoapsis both between 50-49km). Time warp to make changes easier to observe.

Expected: Apsis decrease due to atmospheric drag.

Actual: Apsis increase without additional thrust.

Note: I noticed with some crafts this bug depends on which direction the craft is facing. Facing Prograde/Retrograde decreases the Apsis while facing Radial In/Out would increase them. In the test craft file attached, the Apsis increased regardless of craft orientation.

Included Attachments:

Craft.json