# Ye 2025: Prediscovery Activity of New Interstellar Object 3I/ATLAS: A Dynamically-Old Comet?

> Quanzhi Ye, Michael S. P. Kelley, Henry H. Hsieh, 2025. 1 records on Mysteries Department cite it. Ye, Q., Kelley, M., Hsieh, H. et al. 2025.…

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# Prediscovery Activity of New Interstellar Object 3I/ATLAS: A Dynamically-Old Comet?

Quanzhi Ye, Michael S. P. Kelley, Henry H. Hsieh, 2025. _ApJL 993, L31_.

ZTF: active inward of at least 6.5 au; brightening ~r^-3.8; dust ~5 kg/s (May, ~6 au) to ~30 kg/s (mid-July, ~4 au); steady dust outflow likely began near ~9 au.

**3I/ATLAS** Articledoi: **[10.3847/2041-8213/ae147b](https://doi.org/10.3847/2041-8213/ae147b)** 0

## Cited by on this site 1 record

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

The mystery article

MYS

## Cite it

```
Ye, Q., Kelley, M. S. P., & Hsieh, H. H. (2025). Prediscovery Activity of New Interstellar Object 3I/ATLAS: A Dynamically-Old Comet?. ApJL 993, L31. https://doi.org/10.3847/2041-8213/ae147b
```

[Read it free at arxiv.org](https://arxiv.org/abs/2509.08792)

Key

**SRC** 0DFPWGSFC7BZ

Kind

Journal article

Rights

arXiv-nonexclusive

Kept

2 Nov 2026, for editors

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

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