A debunking-checklist supplement covering the five mundane phenomena most-frequently mistaken for UAP. For each: what it looks like, why it gets confused, and the specific test that distinguishes it from a genuinely anomalous observation.
The Council’s existing debunking checklist (Field Guide FG-007) covers the general framework for testing a sighting against mundane explanations. This guide is a more specific supplement: the five mundane phenomena that, in the Council’s experience reviewing sighting submissions, account for the substantial majority of misidentifications. Each entry describes what the phenomenon looks like, why it generates UAP confusion, and the specific observational test that distinguishes it.
What this guide does NOT do
This guide does not claim that every reported UAP is one of these five phenomena. It claims that, statistically, these five together account for the largest single fraction of misidentifications in the Council’s submission data. Eliminating them as candidates first is the most-efficient triage step.
1. Starlink satellite trains
What it looks like. A train of 30–60 evenly-spaced bright points, moving silently in formation across the sky in a straight line, typically visible 30–90 minutes after sunset or before sunrise. Apparent magnitude ranges from 1 (very bright) immediately after deployment to 5 or fainter as the constellation spreads. Duration: 3–6 minutes from horizon to horizon.
Why it gets confused. The “formation” pattern is genuinely striking on first viewing and is the visual feature most-cited in UAP submissions. The silence is consistent with high-altitude objects of any kind. The straight-line trajectory and uniform spacing are unusual relative to terrestrial aircraft expectations.
The test. Cross-reference the sighting time and location with a Starlink tracker. find-starlink.com, see-a-satellite.com, and the Heavens-Above site all maintain Starlink-pass predictions for any location. A formation pass that matches a published Starlink pass time and trajectory is, with very high probability, Starlink.
The Council’s submission review process performs this cross-reference automatically; a substantial fraction of incoming submissions from the post-2020 period are resolved this way.
The deployment-pass note. Within 12–48 hours of a Starlink launch, the satellites are still in their tight deployment formation and are particularly bright. These deployment-pass formations are the most-spectacular and the most-frequently submitted as UAP. Recent launch dates are publicly available at SpaceX.com/launches.
2. Lens flare and reflection artefacts
What it looks like. In photographic or video material: a bright object (often appearing in mid-air) that is in fact an internal reflection within the camera optics caused by a strong off-frame light source. Flares can appear as orbs, hexagons (the iris shape of the lens), streaks, or rays. They typically appear opposite a bright in-frame light source (sun, moon, streetlight) along the lens axis.
Why it gets confused. Lens flares look genuinely uncanny in still frames and short clips. The “object” appears solid, sometimes appears to move, and is genuinely in the photograph — the photographer is not lying when they say “I saw this on my screen.” The phenomenon is real; the inference (that the flare corresponds to a physical object in the scene) is the error.
The tests.
- The reciprocal-position test. Locate the brightest light source in the scene (sun, streetlight, moon). Draw a line from that source through the lens center. The flare typically appears along that line on the opposite side. If the “UAP” is at the geometric reciprocal position of an in-frame bright source, lens flare is the leading hypothesis.
- The motion test. Pan the camera. A real object in the scene maintains its apparent position relative to background features. A lens flare moves with the camera, not with the scene.
- The optics-cleaning test. Clean the lens. Some “flares” are reflections off internal dust or moisture; cleaning resolves them.
Mick West’s analyses (covered in Field Guide FG-019) include detailed lens-flare reconstructions of several high-profile UAP video cases.
3. International Space Station and other bright satellites
What it looks like. A single bright point of light moving steadily across the sky, magnitude as bright as -4 (brighter than Venus) for the ISS at favorable passes. Duration: 2–6 minutes from horizon to horizon. No flashing strobes (distinguishing from aircraft); no abrupt course changes; no audible sound.
Why it gets confused. A bright moving silent point of light is unusual for observers who have not previously calibrated against satellite passes. The ISS is unmistakable to a trained observer and entirely mysterious to an untrained one. Other satellites — the Tiangong, Hubble, and various Earth-imaging satellites — present similar patterns at lower brightness.
The test. Cross-reference the sighting with a satellite-pass database. Heavens-Above is the gold standard; NASA Spot the Station provides ISS-specific predictions. A pass that matches an ISS or other named-satellite pass for the observation time and location is the satellite.
The pattern note. The ISS and other artificial satellites typically fade into the Earth’s shadow rather than abruptly disappearing. An object that fades rather than vanishes is satellite-consistent; an object that abruptly disappears requires further explanation.
4. Balloons and Chinese lanterns
What it looks like. Slow-moving silent objects that appear self-luminous (Chinese sky lanterns) or sun-lit (high-altitude balloons). Chinese lanterns in particular present as warm orange/red glowing objects drifting with prevailing wind, typically in groups, frequently after dark. High-altitude scientific and military balloons present as bright, slow-moving, sometimes-silver objects at very high altitudes.
Why it gets confused. The slow drift, silence, and occasional grouping are consistent with several UAP report patterns. Chinese lanterns in particular, viewed from a distance at night, are the single most-common single-event UAP misidentification in the Council’s submission data — they are silent, glowing, drift in formation, and can persist for many minutes.
The tests.
- The wind-direction test. Note the prevailing wind direction at the observation altitude. Chinese lanterns and balloons drift with prevailing wind. An object drifting against the wind is not a balloon or lantern.
- The duration test. Chinese lanterns burn for 5–15 minutes before extinguishing. An object that goes out abruptly after that duration is consistent with a lantern.
- The cluster-and-context test. Lanterns are typically released near population centers (parties, weddings, festivals). A grouped sighting near a known event venue, at a typical event-end time, is high-probability lanterns.
5. Lenticular clouds
What it looks like. Smooth, lens-shaped or saucer-shaped clouds that form in the lee of mountains, typically at altitudes from 6,000 to 40,000 feet. Often stacked in multiple distinct layers (the “stack of plates” appearance). Stationary relative to the underlying mountain even as other clouds drift past, because they form at fixed atmospheric pressure points.
Why it gets confused. The disc shape is genuinely saucer-like. The smooth, sculpted appearance is unlike most cloud types and looks artificial in photographs. Stationarity in a moving sky is uncanny.
The tests.
- The mountain-context test. Lenticular clouds form downwind of substantial topography. A lenticular-shaped object near a mountain range or major isolated peak is, with very high probability, a lenticular cloud.
- The persistence-and-shape-change test. Lenticular clouds persist for tens of minutes to hours and gradually change shape as the wind speed and direction shift. An object that persists with structural change is consistent with a cloud; an object that maintains rigid shape and disappears abruptly is not.
- The temperature-and-humidity context. Lenticular formation requires specific atmospheric conditions (stable air, sufficient humidity). The sighting weather context is consistent with cloud formation, not with mechanical aircraft.
A note on the residue
After eliminating these five phenomena, plus standard aircraft, helicopters, drones, planets (especially Venus low on the horizon), and meteors, the residue of cases is small. The residue is also where the genuinely interesting work lives. The Council’s editorial position is that the residue cases — the ones that survive the systematic elimination of mundane candidates — are the cases worth submitting and worth writing up.
A reader who has internalized the five-phenomenon checklist and the broader Field Guide FG-007 debunking discipline will eliminate the great majority of their own initial “what was that?” experiences before submission. That is itself a productive habit.
Equipment that helps
Three items are particularly useful for in-the-moment mundane-phenomenon discrimination.
Binoculars for resolving distant lights into their actual sources. Aircraft running lights, helicopter formations, and balloon clusters become identifiable through binoculars at distances where they are unresolvable to the naked eye. The Vortex Diamondback HD 10×42 is the Council’s recommended handheld; the Celestron SkyMaster 25×100 is the higher-magnification option.
A notebook for recording the time, direction, and context that lets the cross-reference check (Starlink, satellite passes, weather, mountain proximity) be performed accurately afterward. The Rite in the Rain notebook is the standard.
A smartphone with a good planetarium app (Stellarium Plus, SkySafari) — provides Venus, Jupiter, ISS, and Starlink real-time positions for cross-reference.
Council recommended
- Vortex Diamondback HD 10×42 — for in-the-moment resolution of distant lights
- Celestron SkyMaster 25×100 — for higher-power resolution under stable mounting
- Rite in the Rain notebook — for capturing the cross-reference data
Related cases
- Case #00012 — Phoenix Lights (1997) — the modern reference case where the bright objects had multiple candidate mundane explanations (military flares for some sightings, separately a triangular craft for others) and the systematic discrimination work was decisive
- Case #00482 — 3I/Atlas — non-UAP astronomical case where the systematic discrimination of cometary outburst from more-exotic explanations is the central analytical work