Satellites can enter Earth shadow
A satellite may remain bright and steady, then fade to nothing within seconds when it crosses into Earth shadow. This is a normal orbital effect and is especially persuasive when the object showed no blinking and followed a smooth constant track beforehand.
Thin cloud can erase a light too
Patchy high cloud can hide stars, satellites and aircraft without looking obviously cloudy to the observer. Weather-model cloud cover is therefore shown next to the result rather than treated as unrelated background information.
Aircraft can change apparent brightness rapidly
Landing lights can dominate a head-on aircraft and then vanish from view as the aircraft turns. Navigation lights may remain, but at long distance they can be too faint to notice. Sudden dimming alone is therefore not unique to satellites.
Preserve the disappearance point
Compass direction and approximate elevation where the light vanished can later be compared with orbital or flight geometry. Even a rough description such as southwest, halfway up the sky adds more diagnostic value than extra adjectives about brightness.
Verify it with data
Use the Sky Event Radar checker with the actual location and time. The result can compare the observation pattern with modeled weather, current aircraft when applicable, NASA/JPL large-fireball records, NOAA aurora context, launch timing and local sky geometry. Missing feeds remain explicitly unknown.
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