# Méndez 2025: Arecibo Wow! II: Revised Properties of the Wow! Signal from Archival Ohio SETI Data

> Abel Méndez, Kevin N. Ortiz Ceballos, Jorge I. Zuluaga et al., 2025. 7 records on Mysteries Department cite it. The current best estimate of the signal's…

Source: https://mysteriesdept.com/sources/SRC0CXZ4DAR1PCY/arecibo-wow-ii-revised-properties-of-the-wow-signal-from  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[Sources](https://mysteriesdept.com/sources)[Wow! signal](https://mysteriesdept.com/mysteries/wow-signal)Méndez 2025

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# Arecibo Wow! II: Revised Properties of the Wow! Signal from Archival Ohio SETI Data

Abel Méndez, Kevin N. Ortiz Ceballos, Jorge I. Zuluaga et al., 2025. _arXiv_.

A reanalysis of previously unpublished Ohio SETI observations that narrows the signal to two adjacent fields (RA 19h25m02s or 19h27m55s, Dec −26°57′), raises the peak flux above 250 Jy, moves the frequency to 1420.726 ± 0.005 MHz, and argues for an astrophysical over an interference origin.

**Wow! signal** PreprintChecked against the original0

## What it's used for here

The current best estimate of the signal's parameters; supersedes Ehman's values where they differ.

## Cited by on this site 7 records

[It is the brightest of a population of similar transients, natural or interference, recorded by the telescope.](https://mysteriesdept.com/mysteries/wow-signal/answers/ANS0CXZ4Z525NR8/it-is-the-brightest-of-a-population-of-similar-transients)

Answer

ANS

[The 2025 reanalysis finds a frequency shift consistent with a Galactic source and argues interference is less…](https://mysteriesdept.com/mysteries/wow-signal/evidence/EVD0CXZ4QTP6316/the-2025-reanalysis-finds-a-frequency-shift-consistent-with)

Evidence

EVD

[The 2025 reanalysis narrows the two fields to RA 19h25m02s or 19h27m55s but cannot choose between them.](https://mysteriesdept.com/mysteries/wow-signal/evidence/EVD0CXZ4WF44ZPD/the-2025-reanalysis-narrows-the-two-fields-to-ra-19h25m02s)

Evidence

EVD

[The 2025 reanalysis used previously unpublished archive data and found that cold hydrogen clouds produce…](https://mysteriesdept.com/mysteries/wow-signal/evidence/EVD0CXZ4ZCW2EQG/the-2025-reanalysis-used-previously-unpublished-archive-data)

Evidence

EVD

[The revised frequency of 1420.726 MHz implies a Galactic source with a larger radial velocity.](https://mysteriesdept.com/mysteries/wow-signal/evidence/EVD0CXZ4T103TMC/the-revised-frequency-of-1420-726-mhz-implies-a-galactic)

Evidence

EVD

[Arecibo Wow! II revises the signal's position, flux and frequency from the Ohio archive](https://mysteriesdept.com/mysteries/wow-signal/events/EVT0CXZ4NW67SR9/arecibo-wow-ii-revises-the-signals-position-flux-and)

EVT

[The Wow! signal](https://mysteriesdept.com/mysteries/wow-signal)

The mystery article

MYS

## Cite it

```
Méndez, A., Ortiz Ceballos, K. N., Zuluaga, J. I., Palencia-Torres, K. D., Smith, A. J., Cardona Rodríguez, A., Socas-Navarro, H., Kipping, D., Hubbard-James, H. S., Le, M., & Rincón-Torres, A. (2025). Arecibo Wow! II: Revised Properties of the Wow! Signal from Archival Ohio SETI Data. arXiv. https://arxiv.org/abs/2508.10657
```

[Read it free at arxiv.org](https://arxiv.org/abs/2508.10657)

Key

**SRC** 0CXZ4DAR1PCY

Kind

Preprint

Rights

arXiv-nonexclusive

Kept

27 Oct 2026, for editors

Checked

Against the published original

Added by

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

The record

Bibliographic records are CC0. Take this one as CSL-JSON, BibTeX or RIS.

[CSL-JSON](https://mysteriesdept.com/sources/SRC0CXZ4DAR1PCY/arecibo-wow-ii-revised-properties-of-the-wow-signal-from/csl.json)