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Schubart region HS.817

From Hristov, Hristova & Tanikawa (2026)

Schubart region HS.817 is a periodic orbit of the planar three-body problem: three equal masses that return to their starting positions and velocities every 351.84 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 0.0000241 of each other at a top speed of 204, line up 504 times a period, and the computed loop closes to 2.3×10⁻²².

Measured over one period

Period: 351.8421895
Masses: 1 : 1 : 1
Energy: -1.63388
Angular momentum: 0
Closest approach: 2.4×10⁻⁵
Top speed: 203.7
Path length: 887.21
Alignments per period: 504
Topology: ababABAbabaBABabaBABababABAbabaBABabaBABAbabABAbabaBABabaBABAbabABAbabaBABababABAbabABAbabaBABababABAbabABABabaBABAbabABAbabABABabaBABAbabABAbabaBABababABAbabABAbabaBABababABAbabABABabaBABAbabABAbabaBABabaBABAbabABABabaBABababABAbabaBABabaBABababABAbabaBABabaBABAbabABABabaBABabaBABAbabABABabaBAB (free-group class)
Stability: stable (|λ|max 1.000, published)
Loop closure: 2.3×10⁻²²

Neighbours on the map

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