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Free-fall F28

(1, 0.8, 0.4)

From Li & Liao (2019)

Free-fall F28 (1, 0.8, 0.4) is a periodic orbit of the planar three-body problem: three masses in the ratio 1 : 0.8 : 0.4 that return to their starting positions and velocities every 5.311 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 16082), so a small nudge makes it unravel over a few periods. The bodies pass within 0.0000725 of each other at a top speed of 121, line up 26 times a period, and the computed loop closes to 2.1×10⁻²⁴.

Measured over one period

Period: 5.310969719
Masses: 1 : 0.8 : 0.4
Energy: -1.99631
Angular momentum: 0
Closest approach: 7.2×10⁻⁵
Top speed: 120.8
Path length: 17.818
Alignments per period: 26
Topology: 0 (free-group class)
Stability: unstable (|λ|max 16082)
Loop closure: 2.1×10⁻²⁴

Neighbours on the map

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