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Free-fall F61

(1, 0.8, 0.6)

From Li & Liao (2019)

Free-fall F61 (1, 0.8, 0.6) is a periodic orbit of the planar three-body problem: three masses in the ratio 1 : 0.8 : 0.6 that return to their starting positions and velocities every 8.8821 time units, published by Li & Liao (2019). Three bodies released from rest fall together, swing past each other and return to rest exactly where they started. It is unstable (largest Floquet multiplier 531.2), so a small nudge makes it unravel over a few periods. The bodies pass within 0.00216 of each other at a top speed of 19.9, line up 42 times a period, and the computed loop closes to 1.8×10⁻²⁵.

Measured over one period

Period: 8.882126398
Masses: 1 : 0.8 : 0.6
Energy: -2.18106
Angular momentum: 0
Closest approach: 0.002164
Top speed: 19.87
Path length: 29.843
Alignments per period: 42
Topology: 0 (free-group class)
Stability: unstable (|λ|max 531.2)
Loop closure: 1.8×10⁻²⁵

Neighbours on the map

All Free-fall orbits, the families of periodic three-body orbits, or the atlas map.