3I/ATLASEvidence
Evidence · 3I/ATLAS
The missing acceleration turned up
The 5-km claim rested on finding no non-gravitational acceleration through September 2025; with the full arc, the acceleration is required by the data and JPL fits it at 4.6 × 10^-8 au per day squared at 1 au.
What it means
Openunchanged
Disputedunchanged
What it implies
- The premise of the large-size argument no longer holds.For the key question: How big is the nucleus of 3I/ATLAS?
Next steps 1
1
Fit the last Hubble DD 18152 visits for nucleus size
Could decideFair odds~40 h
10score
Details
The final visits (March to April 2026, beyond 5 au) had the faintest coma. A radius fit with coma subtraction that lands inside 0.35-1.8 km would settle the size; one outside would reopen it. The data are public in MAST.
Ranked by how likely each is to move the key question, for the time it takes
Sources 3
SRC
Cite it
Mysteries Department. (2026). The missing acceleration turned up [Evidence EVD0DFQ485CADJ6]. https://mysteriesdept.com/r/EVD0DFQ485CADJ6
@misc{mysteriesdept_evd0dfq485cadj6,
title = {The missing acceleration turned up},
author = {{Mysteries Department}},
year = {2026},
note = {Evidence, catalog key EVD0DFQ485CADJ6},
url = {https://mysteriesdept.com/r/EVD0DFQ485CADJ6}
}