What question did this study set out to answer?

To analyze the influence of a hypothetical third trans-Neptunian perturber on Sednoids using a mass-distance sweep.

May 19, 2026Open Access

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

Key Points

To analyze the influence of a hypothetical third trans-Neptunian perturber on Sednoids using a mass-distance sweep.
Conducted a two-dimensional mass-distance sweep over a hypothetical perturber with variable mass and distance.
Utilized Erebo and Solution B as fixed background bodies during simulations.
Tracked Sedna, 2012 VP113, and Leleakuhonua as test particles.
Best-fit solution identified a perturber with mass of 12M⊕ and semi-major axis of 1000au.
Produced a perihelion shift of +7.46au for Sedna.
Achieved a joint score of 0.692, the highest in the ATMAN v5.0 series.

Abstract

Description: Paper VII of the ATMAN v5.0 series. A two-dimensional mass-distance sweep over a hypothetical third trans-Neptunian perturber P3 with M∈1,20M⊕ and a∈800,2500au, using ATMAN v5.0 with Erebo and Solution B as fixed background bodies. Three Sednoids tracked as test particles: Sedna, 2012 VP113, Leleakuhonua. Best-fit solution: MP3=12M⊕, aP3=1000au, producing ΔqSedna=+7.46au and joint score Sjoint=0.692 — highest in the series. SHA-256: 60c348fd1859e32f5bb45b4e155e4ef52f1f33c5ce823a83aaba536bc8553229. Paper VII of the ATMAN v5.0 series.

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

Key Points

Abstract

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