This is the second video in my DRO series.

DRO is a family of stable orbits around a secondary body in a three body system. Recently famous for being used by Orion spacecraft in the Artemis I mission.

In this video, I placed several test particles around the moon with opposite velcoity vector (retrograde - cyan; prograde - orange) to show that orbits are stable only if the particles are moving in retrograde orbits. The arrows represent the vector for gravity (skyblue), centrifugal force (yellow) and Coriolis force (red).

This simulation is designed to show that only retrograde orbit can be stable in this environment, with Coriolis force acts like a Centripetal force.

Comparing to the last video ([ Ссылка ]), this time the initial condition is carefully chosen (using Secant method for root finding) to produce closed orbits.

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。Setup: Earth-Moon system. Camera is focusing on Moon, the two white dots are L1 and L2.
。Contours: Effective potential from gravity and centrifugal force.
。Solver: RK4 method.
。Code: 100% Python, with numpy and matplotlib.

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