Abstract
Based on the equations of planar motion with drag used in point dynamics, a simple derivation is presented that shows how a constant Keplerian (elliptical) orbit can be obtained with a non-central force field and variable angular momentum.
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Shoucri, R.M. Note on Kepler's problem with variable angular momentum. Celestial Mech Dyn Astr 63, 199–203 (1995). https://doi.org/10.1007/BF00693414
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DOI: https://doi.org/10.1007/BF00693414