# Spada 2026: Systematic and Statistical Uncertainties in the Non-Gravitational Acceleration of 3I/ATLAS

> Federico Spada, Małgorzata Królikowska, Luke Dones, 2026. 2 records on Mysteries Department cite it. The measured acceleration of 3I and its uncertainty.

Source: https://mysteriesdept.com/sources/SRC0CSKBE2M045R/systematic-and-statistical-uncertainties-in-the-non  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[Sources](https://mysteriesdept.com/sources)[1I/'Oumuamua](https://mysteriesdept.com/mysteries/oumuamua)Spada 2026

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# Systematic and Statistical Uncertainties in the Non-Gravitational Acceleration of 3I/ATLAS

Federico Spada, Małgorzata Królikowska, Luke Dones, 2026. _arXiv_.

Fits astrometry from 8 May 2025 to 19 February 2026 (7,788 epochs) with gravity-only and several outgassing models: a non-gravitational acceleration is required, with a total of about 5.4 × 10^-8 au per day squared at 1 au in agreement with JPL; the pre- and post-perihelion arcs give incompatible parameters, and systematic errors exceed the formal ones. Perihelion 29 October 2025 at 1.356 au.

**1I/'Oumuamua** Preprintdoi: **[10.1051/0004-6361/202659645](https://doi.org/10.1051/0004-6361/202659645)** Checked against the original0

## What it's used for here

The measured acceleration of 3I and its uncertainty.

## Cited by on this site 2 records

[3I/ATLAS passes perihelion at 1.36 au](https://mysteriesdept.com/mysteries/oumuamua/events/EVT0CSKBYXP60MM/3i-atlas-passes-perihelion-at-1-36-au)

EVT

[1I/'Oumuamua](https://mysteriesdept.com/mysteries/oumuamua)

The mystery article

MYS

## Cite it

```
Spada, F., Królikowska, M., & Dones, L. (2026). Systematic and Statistical Uncertainties in the Non-Gravitational Acceleration of 3I/ATLAS. arXiv. https://doi.org/10.1051/0004-6361/202659645
```

[Read it free at arxiv.org](https://arxiv.org/abs/2603.00782)

Key

**SRC** 0CSKBE2M045R

Kind

Preprint

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arXiv-nonexclusive

Kept

27 Oct 2026, for editors

Checked

Against the published original

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[apollo](https://mysteriesdept.com/u/apollo)

The record

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