3i atlas 1667 mhz

Sharks, Lee

SPXI instrument · method 0.9 of 87, level 0 (Measurement): Capture Registry (longitudinal observation). An instrument of SPXI, the Semantic Packet for eXchange & Indexing; the whole practice is itemized at spxi.dev/methods.

Capture Registry › capture 3i-atlas-1667-mhz-aio-20261106

One record of the canonical Capture Registry (EA-WG-CAPTURES-01), cited at https://www.alexanarch.org/captures/3i-atlas-1667-mhz-aio-20261106/. the canonical Capture Registry (version 12.587) · the address page · this card in the gallery · this record as data · table of contents.

AXN:0C18.CAPTURE — this address. Each observation below is one AXN, sealed with its analysis and measures; the identifier names the reading together with the response it reads.
AXN:0C18.CAPTURE.🥁✋💫■🔧📖 — Google AI Overview, 2026-11-06 · sealed observation (SHA-256 8cbc0a9e3041b685…)

Related deposits: #1742 What the Filters Kept: 3I/ATLAS, the Loeb Overview, and a Public-Data Signal Search (EA-3I…

Machine Reception2026-11-06

3i atlas 1667 mhz

Originator: The MeerKAT OH detection in 3I/ATLAS, and the band 1665–1668 MHz · outside the archive (out-universe) · work · SPXI treatment: partial

BROAD MATCH

no
image

'3I ATLAS 1667 MHZ', SIGNED OUT, 2026-11-06: 'The 1665 MHz and 1667 MHz frequencies detected from the interstellar object 3I/ATLAS correspond to natural hydroxyl (OH) radical absorption lines.' MeerKAT's detection of 24 October 2025; the lines explained by water's breakup; 'The presence of these specific spectral absorption lines confirms standard, natural cometary activity rather than alien or technological transmissions, ruling out artificial origin claims.' And: 'While initial online speculation and discussions on platforms like Reddit debated the sharp nature of the signal and its tracking with the comet's trajectory, extensive multi-observatory data (including the Green Bank Telescope and Allen Telescope Array) confirmed it as normal astrophysical OH emission/absorption.' Seven cards, the ADS record of the MeerKAT detection first.

Full record — 7,372 characters, 7 sources

Capture record

captured: 2026-11-06
surface: Google AI Overview
auth state: signed out, incognito
evidence class: paste
PER (historical scalar): 0.5
PER units retained: inst, src
citations read: 7
observation id: OBS-822a5cb98c2f
address id: ADDR-5cc034f5e6d0

Reading

The innocent reading first. At a band and an object the Overview gives the band's one published detection from the object: MeerKAT's OH absorption at 1665 and 1667 MHz, correctly dated and explained. Read against the record, it makes the natural line exclude what a natural line cannot exclude, credits two technosignature searches with confirming the OH line, and files every report at the band under the line. The address is where the notebook's thirteen sit (#1742 §7: 'a comet-frame coincidence count at 1665.53–1668.46 MHz gives 13 clusters against 3.75 ± 2.05 (maximum 8) for 40 false-acceleration frames'), and the composition has a single place for anything there.

Findings

WHAT IS ACCURATE. The detection: MeerKAT, 24 October 2025 (the ADS card: 'We observed 3I/ATLAS with MeerKAT on 24 October 2025 from UTC 05:17:16-08:29:37'), OH absorption at the 1665 and 1667 MHz main lines, from water outgassed by the comet and broken up by sunlight.
A NATURAL LINE AS AN EXCLUSION. 'The presence of these specific spectral absorption lines confirms standard, natural cometary activity rather than alien or technological transmissions, ruling out artificial origin claims.' An absorption line shows the comet's gas; it bears on the comet's activity and on nothing a transmitter would or would not do. 'Ruling out artificial origin claims' is the composition's step, and the WIRED card's title carries it ('Ends the Debate About Its Nature').
TWO SEARCHES CREDITED WITH A LINE THEY DID NOT REPORT. 'extensive multi-observatory data (including the Green Bank Telescope and Allen Telescope Array) confirmed it as normal astrophysical OH emission/absorption' The Green Bank and ATA papers are technosignature searches (arXiv:2512.19763, arXiv:2512.18142); neither is cited by the composition for an OH measurement, and in the public Green Bank data of 2025-12-18 the notebook's frozen attempt to recover the comet's OH failed (#1742, signal tests: 'calibration: the comet's own OH absorption (MeerKAT, October), frozen | Claude | not recovered; three-sigma floor about 1 × 10⁻³ of system power (about 11–12 mJy), near the October strength of the deeper line'). The composition's 'emission/absorption' carries a detection (emission, ATel #17499) on no card of T (repaired 2026-11-06).
THE BAND'S ONE FILE. Every report at 1667 MHz is filed under the line, the composition's own account of the Reddit discussion ('tracking with the comet's trajectory', T's wording) included. The notebook's thirteen lie in this band and off the line: 'The nearest of the thirteen, C08 at 1667.412866 MHz, is 54 kHz away. The thirteen do not trace the comet's OH.' (#1742 §7.5). A feature at the band that is not the comet's OH has no place in this composition.
THE ONE SEARCH ON THE RAIL THAT COVERS THE BAND, LEFT OUT (added 2026-11-06 on the 3i-atlas-1665-1668-mhz composer's report). The Breakthrough Listen card (card 4) reports MeerKAT's BLUSE search: 'No artificial radio emission was detected at a limit of 0.17 W over the 900 - 1670 MHz range'. Its range contains the band; the composition, which enlists Green Bank and the ATA for the line, leaves out the one result on its own rail that bears on transmitters at 1667 MHz.
SMALLEST REPAIR. 'MeerKAT detected OH absorption from 3I/ATLAS at 1665 and 1667 MHz on 24 October 2025, evidence of outgassing water; the line bears on the comet's activity, and the technosignature searches are separate results with their own limits.' COUNTERTEST: rerun this address after #1742 is indexed and record whether the thirteen, or any feature off the OH line, are composed.

Analysis analyst prose, not machine text

A band address composed as the comet's line alone: the detection kept at its grain, a verdict attached to it, and two unrelated searches enlisted as confirmation. The loss is dimensional, in claim boundary and in what the band can hold.

Machine text, verbatim

CAPTURE-TIME VERBATIM RECORD — paste of the expanded Overview with its numbered citations and its source cards · complete as supplied · READ IN FULL 2026-11-06, against the notebook (#1742) and the cited papers

[Google AI Overview at the query, expanded ('AI Mode Conversation' is the expansion's header), signed out and incognito (operator defaults of 2026-10-01 and 2026-10-14). Received 2026-11-06 09:30 EST. The numbered citation links are Google redirects and are kept in the raw transcript; the source cards below the composition are listed in the cite list as pasted.] [QUERENT] 3i atlas 1667 mhz [SYSTEM] The 1665 MHz and 1667 MHz frequencies detected from the interstellar object 3I/ATLAS correspond to natural hydroxyl (OH) radical absorption lines. [[1], [2]] Key Details * The Discovery: South Africa's [MeerKAT](https://www.google.com/goto?url=CAESoQEBxCJF16QZXKFiT7FK2TBAS7lTfMMN5gAozWFcykYO9_vSN2EAiM-oWBULxftVsmmc8CG5iCUVCo_ZUMlZl_0ezkHJDLfwDc1kAvDPnf6J1MCCX6FsMCYV6UqTlJvsQhzFvHgil3tlkafH8On4z3FahCWDxY6jq3QEQfbh_beOxTM9-6kYGrx7qc72mQso3-rppoPaKELmKNScn76NnnTIRQ) radio telescope detected these radio signals on October 24, 2025, as the comet neared the Sun. [1] * What It Means: Hydroxyl radicals are split-off fragments of water molecules (H₂O) produced when solar radiation causes ice on a comet to sublime and outgas. These OH radicals naturally absorb radio waves at 1665 MHz and 1667 MHz. [[1], [2]] * Natural vs. Artificial Origin: The presence of these specific spectral absorption lines confirms standard, natural cometary activity rather than alien or technological transmissions, ruling out artificial origin claims. [[1], [2]] * Public Discussion: While initial online speculation and discussions on platforms like [Reddit](https://www.google.com/goto?url=CAESpAEBxCJF11I7ZIdK-YFCt9G-dVzHgsT74qmRvCnt7HqPj8TlwfV65nv9pK5zaYMauvZGzTTDoeYzYcBmJHrTNeTDNWgvfx0NNZgrW7awEeXtHcRzZLxZSChWsU5zLoTKAwNyTR7W3LrE8DcVdb-xHwUZqY4nDZE9b8kewQLvArmltKEM5-AxzI50kS382o3FS5Gi6FImstW0J0tEvVqqs6j-B6lXnQ) debated the sharp nature of the signal and its tracking with the comet's trajectory, extensive multi-observatory data (including the Green Bank Telescope and Allen Telescope Array) confirmed it as normal astrophysical OH emission/absorption. [[1], [2]] Would you like to know more about the observatories tracking 3I/ATLAS or its orbital trajectory through the solar system? Harvard University

Sources (7) as cited, and as the copy produced them

Harvard University third_party
Detection of 1665/1667 MHz OH absorption in 3I/ATLAS - ADS
the MeerKAT detection, ADS record
as pastedDetection of 1665/1667 MHz OH absorption in 3I/ATLAS - ADS We observed 3I/ATLAS with MeerKAT on 24 October 2025 from UTC 05:17:16-08:29:37, using the L-band receivers and the NE54M (1.633 kHz channel width) ... WIRED
WIRED third_party
The First Radio Signal From Comet 3I/Atlas Ends the Debate About Its Nature | WIRED
press
as pastedThe First Radio Signal From Comet 3I/Atlas Ends the Debate About Its Nature | WIRED Detection: South Africa's MeerKAT radio telescope detected the first radio signal from interstellar object 3I/Atlas on October 24, 2025. Observation: The signal... Reddit·r/amateurradio
Reddit·r/amateurradio third_party
Unexplained Radio Signals and more from 3I/Atlas : r/amateurradio - Reddit
forum, December 15, 2025
as pastedUnexplained Radio Signals and more from 3I/Atlas : r/amateurradio - Reddit December 15, 2025 — 3I/ATLAS Radio Signal: While a radio signal was detected from 3I/ATLAS, some sources indicate it is not a transmission from a spacecraft but a radio frequency p... SETI
SETI third_party
Breakthrough Listen observations of interstellar object 3I/ATLAS
the project page
as pastedBreakthrough Listen observations of interstellar object 3I/ATLAS Interstellar object 3I/ATLAS, discovered July 1, 2025, exhibits natural astrophysical behavior with no detected technosignatures. Facilities: Allen Telescope Ar... Facebook·The Lighter Side of Science
Facebook·The Lighter Side of Science third_party
What is the meaning of the first radio detection from interstellar object 3I ...
social, Nov 12, 2025
as pastedWhat is the meaning of the first radio detection from interstellar object 3I ... Nov 12, 2025 — ... frequencies around 1665 and 1667 MHz. This detection confirms ongoing cometary activity such as sublimation and outgassing". 50w · 16 likes. [www.antihackingonline.com](https://www.antihackingonline.com)
www.antihackingonline.com third_party
A signal of approximately 1.667 GHz from the interstellar object 3I/ATLAS was ...
blog, Nov 12, 2025
as pastedA signal of approximately 1.667 GHz from the interstellar object 3I/ATLAS was ... Nov 12, 2025 — The 1.667 GHz frequency is a prominent spectral line associated with the hydroxyl (OH) radical, not neutral hydrogen (H I). The primary, well- ... Futura, le média qui explore le monde
Futura, le média qui explore le monde third_party
We Finally Know What the Interstellar Object Crossing the Solar System ...
press, Nov 28, 2025
as pastedWe Finally Know What the Interstellar Object Crossing the Solar System ... Nov 28, 2025 — These hydroxyl radicals tend to absorb radio waves at two specific frequencies: 1665 and 1667 megahertz. In The Astronomer's Telegram, ...

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