What question did this study set out to answer?

This research aims to explore the influence of a hypothesized third trans-Neptunian perturber on Sednoids, particularly Sedna's perihelion.

May 18, 2026Open Access

The Sedna Anomaly and a Third Trans-Neptunian Perturber: A Perihelion-Lifting Sweep with ATMAN v5.0 (Paper VII)

Puntos clave

This research aims to explore the influence of a hypothesized third trans-Neptunian perturber on Sednoids, particularly Sedna's perihelion.
Conducted a two-dimensional mass-distance sweep using ATMAN v5.0 for a third perturber (P3) with masses between 1 to 20 Earth masses and distances from 800 to 2500 AU.
Tracked three Sednoids: 90377 Sedna, 2012 VP113, and Leleakuhonua while using Erebo and Solution B as fixed bodies.
Evaluated the change in perihelion (Δq) and identified the most effective mass and distance for P3.
The optimal parameters found for P3 are mass M_P3 = 12 M⊕ and distance a_P3 = 1000 AU, resulting in a perihelion lift of ΔqSedna = +7.46 AU.
Compared to control conditions, which resulted in Δq = -3.94 AU, confirming the necessity of P3 for positive perihelion lifting.
The system architecture with P3 at 1000 AU leads to three independent dynamical sectors in the outer Solar System.

Resumen

(Abstract) We present a two-dimensional mass–distance sweep over a hypothetical third trans-Neptunian perturber (P3) with M ∈ 1, 20 M⊕ and a ∈ 800, 2500 au, using ATMAN v5. 0 with Erebo and Solution B as fixed background bodies. Three Sednoids are tracked: 90377 Sedna, 2012 VP113, and Leleakuhonua. The sweep identifies a preferred solution at MP3 = 12 M⊕, aP3 = 1000 au, producing perihelion lifting ΔqSedna = +7. 46 au (from 78. 43 to 85. 89 au) and a joint score Sⱼoint = 0. 692 — the highest in the series at the time. The control run (Erebo + Solution B only) produces Δq = −3. 94 au, confirming that positive lifting requires P3. The signal is localised near a 1: 3 mean-motion commensurability between P3 (P ∼ 31, 600 yr) and Sedna (P ∼ 11, 400 yr). The three-perturber architecture (Solution B at 75 au, Erebo at 600 au, P3 at 1000 au) partitions the outer Solar System into three independent dynamical sectors. SHA-256 (simulation output): 60c348fd1859e32f5bb45b4e155e4ef52f1f33c5ce823a83aaba536bc8553229. This is Paper VII of the ATMAN v5. 0 series. Author: Ariel Fernando Martini, Buenos Aires, Argentina (2026). Contact: arielₘartini₃@hotmail. com

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Ariel Fernando Martini (Fri,) studied this question.

synapsesocial.com/papers/6a0aad2a5ba8ef6d83b70b1f https://doi.org/https://doi.org/10.5281/zenodo.20222288

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