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Schubart region HS.172

From Hristov, Hristova & Tanikawa (2026)

Schubart region HS.172 is a periodic orbit of the planar three-body problem: three equal masses that return to their starting positions and velocities every 119.23 time units, published by Hristov, Hristova & Tanikawa (2026). Stable orbits that pass extremely close to a binary collision, descended from Schubart’s rectilinear orbit. They needed 100-digit arithmetic to find. It is linearly stable (largest Floquet multiplier 1.000), so a small nudge only makes it wobble. The bodies pass within 0.00000148 of each other at a top speed of 823, line up 250 times a period, and the computed loop closes to 3.9×10⁻²⁰.

Measured over one period

Period: 119.2321641
Masses: 1 : 1 : 1
Energy: -2.08356
Angular momentum: 0
Closest approach: 1.5×10⁻⁶
Top speed: 823.3
Path length: 320.59
Alignments per period: 250
Topology: 0 (free-group class)
Stability: stable (|λ|max 1.000, published)
Loop closure: 3.9×10⁻²⁰

Neighbours on the map

All Schubart region, the families of periodic three-body orbits, or the atlas map.