# SWAN standard model: 3.17 × 10^29 on 6 November

> Fitting the SOHO/SWAN hydrogen coma with their standard model, Combi and colleagues found 3.17 × 10^29 water molecules a second on 6 November 2025 at…

Source: https://mysteriesdept.com/mysteries/3i-atlas/evidence/EVD0DFQ55HTM3KJ/swan-standard-model-3-17-10-29-on-6-november  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[3I/ATLAS](https://mysteriesdept.com/mysteries/3i-atlas)Evidence

Evidence · 3I/ATLAS

# SWAN standard model: 3.17 × 10^29 on 6 November

Fitting the SOHO/SWAN hydrogen coma with their standard model, Combi and colleagues found 3.17 × 10^29 water molecules a second on 6 November 2025 at 1.40 au.

Supported0

## What it means

Key question[Why did 3I/ATLAS's activity and chemistry change so much across perihelion?](https://mysteriesdept.com/mysteries/3i-atlas/questions/QST0DFQ0NWRSHDV/why-did-3i-atlass-activity-and-chemistry-change-so-much)

No answer ahead yet

**Open** unchanged

Part of it[How much water did 3I/ATLAS release at its peak after perihelion?](https://mysteriesdept.com/mysteries/3i-atlas/questions/QST0DFQ0T8NXG7Q/how-much-water-did-3i-atlas-release-at-its-peak-after)

2 answers, none ahead yet

**Open** unchanged

Answer this evidence bears on[About 3 × 10^29 molecules a second](https://mysteriesdept.com/mysteries/3i-atlas/answers/ANS0DFQ35CB0ADR/about-3-10-29-molecules-a-second)

Supports1 for, none against

**Still possible** was No evidence yet

What it implies
1.

The high value comes from a single date and one model.For: How much water did 3I/ATLAS release at its peak after perihelion?

## Next steps 1

1

Run both SWAN models on the same frames

Could decidePoor odds~60 h

[On: How much water did 3I/ATLAS release at its peak after perihelion?](https://mysteriesdept.com/mysteries/3i-atlas/questions/QST0DFQ0T8NXG7Q/how-much-water-did-3i-atlas-release-at-its-peak-after)

**2** score

Details

Apply the Combi and Tan hydrogen-coma models to the same SOHO/SWAN images for 6 November 2025. Agreement near 4 × 10^28 rules out the high value; agreement near 3 × 10^29 rules out the low one. Needs the SWAN team's processed frames.

Ranked by how likely each is to move the key question, for the time it takes

## Sources 1

[Water Production of Interstellar Comet 3I/ATLAS from SOHO/SWAN Observations after Perihelion](https://mysteriesdept.com/sources/SRC0DFPWGSFGPRG/water-production-of-interstellar-comet-3i-atlas-from-soho)

Combi 2025

SRC

## Cite it

```
Mysteries Department. (2026). SWAN standard model: 3.17 × 10^29 on 6 November [Evidence EVD0DFQ55HTM3KJ]. https://mysteriesdept.com/r/EVD0DFQ55HTM3KJ
```

Key

**EVD** 0DFQ55HTM3KJ

Kind

Evidence

Tier

Supported

Found in

[Session 1](https://mysteriesdept.com/mysteries/3i-atlas/sessions/SES0DFQC03S98K5/session-1-3i-atlas-opened-the-literature-to-november-2026) · 2 Nov 2026

Version

1

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

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