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Arecibo’s 2003 UX34 Radar Images: The ‘Cosmic Disc’ Had a Better Explanation

Arecibo radar images of asteroid 2003 UX34 inspired claims that a strange disc appeared beside the object. The real scientific record is interesting enough: the 2017 observations helped reveal that the asteroid has a companion.

By Paranormal Warehouse

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September 18, 2026

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3–4 minutes
Editorial illustration of a radio telescope and radar-style view of an asteroid with a smaller companion object.

PW CASE FILE · ASTRONOMY / UFO CLAIM · STATUS: EXPLAINED

A strange shape beside an asteroid. Arecibo radar. A perfectly good recipe for an alien-spacecraft headline.

That was the basic premise behind an older Paranormal Warehouse article about asteroid 226514, better known as 2003 UX34. The 2017 radar imagery is genuine. The interpretation that something artificial was hiding beside the asteroid is where the story went off course.

WHAT ARECIBO ACTUALLY OBSERVED

2003 UX34 is a near-Earth asteroid discovered by Spacewatch at Kitt Peak in October 2003. In January 2017, radar observations were conducted using both Goldstone and Arecibo as the asteroid passed close enough for detailed study.

The Lunar and Planetary Institute’s asteroid database preserves multiple Arecibo delay-Doppler images from January 4–6, 2017, along with continuous-wave radar spectra from the same observing campaign.

Those images do not behave like normal optical photographs. A delay-Doppler radar image maps reflected radio energy using time delay and Doppler frequency, so shapes can appear stretched, arced or duplicated in ways that are not intuitive if you read them like a camera image.

THE RADAR EVIDENCE: SEE THE ORIGINAL SOURCE

Editorial illustration depicting the Arecibo telescope and asteroid 2003 UX34 with a smaller companion, not original radar data.
EDITORIAL ILLUSTRATION — A visual introduction to the Arecibo observations. This is not an original 2017 radar image.

OPEN THE GENUINE JANUARY 2017 RADAR IMAGE GALLERY AND ANIMATION →

At the Lunar and Planetary Institute’s primary-source gallery, find “Delay-Doppler Images” for January 4, 5 and 6, then “Animations” for January 5. Those measurements depict asteroid 226514 (2003 UX34), not a conventional optical photograph. The gallery belongs to its source institution; we have linked to the actual data instead of reproducing the radar files without confirmed republication rights. If permission is obtained, the original radar stills and animation can be placed here with their scientific credit and observation dates.

Source: Lunar and Planetary Institute, Arecibo Observatory radar repository, 226514 (2003 UX34). Related verification: NASA/JPL binary near-Earth asteroid catalog. Illustration above is a Paranormal Warehouse editorial visual; do not interpret it as photographic evidence.

THE COMPANION WAS REAL

Here is the part that makes the case genuinely interesting: 2003 UX34 is a binary asteroid system.

Radar records indicate that a smaller companion was discovered during the January 2017 observations. Independent asteroid databases list the system as having a primary roughly a few hundred meters across and a secondary object orbiting nearby.

That means the “second object” idea was not invented out of thin air. There really was another body in the system. What the scientific record does not support is the leap from “companion object” to “artificial disc-shaped spacecraft.”

WHY RADAR IMAGES LOOK WEIRD

Planetary radar is built to measure distance, rotation, shape, motion and surface properties. It is not producing a conventional photograph from a fixed viewpoint.

In delay-Doppler imaging, one axis represents range and the other represents radial velocity. A round or irregular object can therefore create arcs and asymmetric structures in the resulting image depending on rotation, orientation, resolution and the geometry of the observation.

Reading those shapes as literal silhouettes is one of the easiest ways to turn scientific imagery into a false anomaly.

WHAT THE ORIGINAL PW ARTICLE NEEDED

The earlier version of this story framed the adjacent structure as a mysterious symmetrical “cosmic disc” and left the artificial-object interpretation more open than the evidence justified.

The better version starts with the primary scientific sources. Once you do that, the case becomes less alien—but more accurate: Arecibo and Goldstone were observing a potentially hazardous near-Earth asteroid and helped characterize a binary system.

PW TAKE

Current PW status: Explained as radar observations of a binary asteroid system. No evidence identified for an artificial spacecraft.

The lesson is useful beyond this one image. Scientific sensor data can look deeply strange when stripped of the instrument context needed to interpret it. That does not make the anomaly fake. It means the instrument has to be understood before the shape gets a story attached to it.

SOURCES & FURTHER READING

  • Lunar and Planetary Institute — original January 2017 Arecibo radar images and animation
  • NASA/JPL radar research — catalog of binary near-Earth asteroids (lists 226514 / 2003 UX34)
  • NASA/JPL Goldstone — 2017 observation planning and target details
  • UCLA Small-Body Radar Database — 226514 (2003 UX34)

Continue exploring: Compare another misleading scientific image in our NASA Mars “Jellyfish” case, or browse the Paranormal Warehouse case-file archive.

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PW EDITORIAL STANDARD — Paranormal Warehouse separates reported claims from verified facts whenever possible. Read our Editorial Policy.

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