# Thoss 2026: Inferring the mass and size of 3I/ATLAS from its non-gravitational acceleration

> Valentin Thoss, Abraham Loeb, Andreas Burkert, 2026. 1 records on Mysteries Department cite it. A 2026 estimate from Loeb's group that is smaller than…

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# Inferring the mass and size of 3I/ATLAS from its non-gravitational acceleration

Valentin Thoss, Abraham Loeb, Andreas Burkert, 2026. _arXiv_.

A mass-loss model of the acceleration giving a radius of 0.42 km if CO2 drives it, or 0.74-1.15 km for water, against the 1.3 km photometric radius; the authors say a higher CO2 rate or a lower density would close the gap.

**1I/'Oumuamua** PreprintChecked against the original0

## What it's used for here

A 2026 estimate from Loeb's group that is smaller than Hubble's; recorded for balance.

## Cited by on this site 1 record

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

The mystery article

MYS

## Cite it

```
Thoss, V., Loeb, A., & Burkert, A. (2026). Inferring the mass and size of 3I/ATLAS from its non-gravitational acceleration. arXiv. https://arxiv.org/abs/2603.15735
```

[Read it free at arxiv.org](https://arxiv.org/abs/2603.15735)

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**SRC** 0CSKBEJ85VWQ

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arXiv-nonexclusive

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27 Oct 2026, for editors

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