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Schubart region HS.820

From Hristov, Hristova & Tanikawa (2026)

Schubart region HS.820 is a periodic orbit of the planar three-body problem: three equal masses that return to their starting positions and velocities every 274.09 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 0.00168 of each other at a top speed of 24.4, line up 518 times a period, and the computed loop closes to 4.7×10⁻²⁵.

Measured over one period

Period: 274.0879632
Masses: 1 : 1 : 1
Energy: -1.93449
Angular momentum: 0
Closest approach: 0.001677
Top speed: 24.41
Path length: 682.02
Alignments per period: 518
Topology: (ababABAB)³⁷ (free-group class)
Stability: stable (|λ|max 1.000, published)
Loop closure: 4.7×10⁻²⁵

Neighbours on the map

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