Atlas1,766 of 3,942

II.C.78

m₃ = 0.5

From Li & Liao (2017)

II.C.78 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 50.943 time units, published by Li & Liao (2017). The largest class in the atlas: hundreds of II.C orbits for seven mass ratios. It is unstable (largest Floquet multiplier 426.5), so a small nudge makes it unravel over a few periods. The bodies pass within 0.00162 of each other at a top speed of 28.7, line up 110 times a period, and the computed loop closes to 4.4×10⁻²⁵.

Measured over one period

Period: 50.94289837
Masses: 1 : 1 : 0.5
Energy: -1.41826
Angular momentum: 0
Closest approach: 0.001618
Top speed: 28.74
Path length: 140.03
Alignments per period: 110
Topology: aaaBBabAAbbAAbaBBaabABabABabAABaBAbabAbabABaBAABaBAbaBAbaaBBaBAAbaBAbaBB (free-group class)
Stability: unstable (|λ|max 426.5)
Loop closure: 4.4×10⁻²⁵

Neighbours on the map

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