Indeed it doesn't work in stock KSP, but it works using a mod called Principia[1] which implements N-body physics!
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[1] https://forum.kerbalspaceprogram.com/index.php?/topic/162200...
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[1] https://forum.kerbalspaceprogram.com/index.php?/topic/162200...
Wow <3. I though the mod only did n-body physics, but it seems it goes beyond that. Thanks!