Atlas1,993 of 3,942

II.C.219

m₃ = 0.5

From Li & Liao (2017)

II.C.219 m₃ = 0.5 is a periodic orbit of the planar three-body problem: three masses in the ratio 1 : 1 : 0.5 that return to their starting positions and velocities every 129.85 time units, published by Li & Liao (2017). The largest class in the atlas: hundreds of II.C orbits for seven mass ratios. It is linearly stable (largest Floquet multiplier 1.000), so a small nudge only makes it wobble. The bodies pass within 0.0000886 of each other at a top speed of 123, line up 260 times a period, and the computed loop closes to 3.9×10⁻²⁴.

Measured over one period

Period: 129.8525440
Masses: 1 : 1 : 0.5
Energy: -1.30296
Angular momentum: 0
Closest approach: 8.9×10⁻⁵
Top speed: 122.6
Path length: 328.37
Alignments per period: 260
Topology: ababAbaBABaBABabAbabABabABAbABAbaBAbaBAbaBABaBABabABabABabABAbABAbaBAbaBAbaBABaBABabABabABabABAbABAbaBAbaBAbaBABaBABabABabABabABAbABAbaBAbaBAbaBABaBABabABabaBabABAbABAbaB (free-group class)
Stability: stable (|λ|max 1.000)
Loop closure: 3.9×10⁻²⁴

Neighbours on the map

All II.C orbits, the families of periodic three-body orbits, or the atlas map.