Earth’s Temporary Mini-Moon: What It Is and How Long It Stays

What is Earth’s new mini-moon?

2026 QQ8 is a small space rock that Earth’s gravity has temporarily captured. Instead of passing by once, it is following a looping path around Earth for a short time. Astronomers call this kind of temporary capture a mini-moon, but the name can give a misleading impression: it is not a permanent companion like our familiar Moon. ¹²³

The Minor Planet Center reported the object in October 2026 after Hungarian astronomer Krisztián Sárneczky discovered it in August. Follow-up observations helped establish that it is a natural object, likely a small asteroid, rather than a piece of human-made space debris. ¹²³

How long will 2026 QQ8 stay near Earth?

The reports agree that 2026 QQ8 entered Earth’s temporary gravitational hold in April 2026. They differ slightly in how they describe its departure: EarthSky says it should remain through December, while The Independent says it will escape in 2027. The safest summary is that it is expected to leave around the end of 2026 or in 2027; the supplied reports do not give one exact departure date. ¹²

After it escapes Earth’s temporary hold, it will continue along its path around the Sun. One report says it completes about one and a half revolutions around Earth before escaping. ¹

How big is the mini-moon, and how close will it get?

Published estimates vary: EarthSky describes 2026 QQ8 as about one metre across, while The Independent and Meteored put it at roughly two metres, or one to two metres. The available reports do not settle on a more precise size. ¹²³

Despite the headlines, it will not pass especially close to Earth. EarthSky gives a closest distance of 0.0038 astronomical units, or about one and a half times the average distance from Earth to the Moon. The Independent gives a similar comparison and estimates about 568,000 kilometres. ¹²

Is this really a second moon, and is it dangerous?

Not in the usual sense. The Moon is Earth’s familiar, long-term natural satellite; 2026 QQ8 is a much smaller object held temporarily by Earth’s gravity. Calling it a mini-moon is a convenient description of that brief orbital relationship, not a sign that Earth has gained another lasting moon. ¹²³

The reports say there is no reason to worry about a collision. Its predicted closest approach remains far beyond the Moon’s average distance, and the sources describe the asteroid as too small to pose a threat. They also say that if an object of this size entered Earth’s atmosphere, it would likely be destroyed or produce a brief fiery display. ¹²

How do astronomers know what it is?

At first, astronomers could not rule out the possibility that 2026 QQ8 was human-made debris. Further observations with the University of Hawaii 2.2-metre telescope and the Lowell Discovery Telescope helped resolve that uncertainty. The Minor Planet Center then reported that no connection to known artificial objects had been found, and EarthSky describes the object as natural in origin. ²⁴

The orbit and departure timing are based on observations and calculations, so they describe the expected path rather than a promise that every detail is exact. The reports do not provide a precise date for when the temporary capture will end. ¹²⁴