Earth has acquired a temporary companion in space, but it will not stay for long. A small space rock named 2026 QQ8 was pulled into Earth's gravitational grip in April 2026, remained unnoticed for months and was first spotted in August. Now confirmed as a natural object, the roughly 1–2-metre-wide asteroid is expected to remain temporarily bound to our planet until December before escaping and continuing its journey around the Sun in 2027. The discovery was reported by the International Astronomical Union's Minor Planet Center on October 29, after astronomers had gathered enough observations to establish the object's identity and trajectory. Hungarian astronomer Krisztián Sárneczky first observed it on August 19–20, according to reports by Space.com. Initially, however, scientists were unsure whether the faint object was a natural space rock or human-made debris from an old rocket or satellite. Follow-up observations helped resolve that uncertainty. Astronomers used the University of Hawaii's 2.2-metre telescope and the Lowell Discovery Telescope to study the object. The additional measurements, including how it responded to solar radiation pressure, helped rule out an artificial origin. The Minor Planet Center subsequently classified it as a natural object, most likely a small asteroid, and described it as a temporarily captured object.
How Earth captured its new mini-moon
The object did not begin orbiting Earth because it was launched towards the planet or deliberately placed there. Instead, it passed close enough for Earth's gravity to temporarily alter its path. Orbital calculations indicate that 2026 QQ8 entered Earth's gravitational sphere of influence in late April. This region is often described using the concept of the Hill sphere, the area around a planet where its gravitational pull can dominate the motion of a smaller passing object against the Sun's influence. When an asteroid passes through this region under the right conditions, it can become temporarily captured. It may then travel around the planet before eventually escaping and returning to an independent orbit around the Sun. Unlike Earth's permanent Moon, however, a mini-moon does not necessarily follow a stable, circular path. Its trajectory can be irregular, and its stay may last only weeks or months. In the case of 2026 QQ8, astronomers expect the temporary capture to last roughly eight to nine months. The asteroid is also not particularly close to Earth by lunar standards. Its closest predicted distance during this temporary stay is about 568,000 kilometres, roughly one-and-a-half times the average distance between Earth and the Moon. It is therefore not expected to pose an impact threat.
A visitor that returns to Earth's neighbourhood
Although 2026 QQ8 has only recently been recognised as a mini-moon, its path suggests that it has approached Earth before. According to orbital analysis reported by EarthSky, the object comes relatively close to our planet approximately once every decade. It passed near Earth in 1965, but did not come close enough to be captured by its gravity. Its next predicted approach in 2058 is also not expected to result in another temporary capture. Scientists have calculated that 2026 QQ8 takes approximately 359 days to complete one orbit around the Sun, slightly shorter than an Earth year. Its current temporary stay is therefore an interruption in its usual journey around the star, rather than the beginning of a permanent relationship with our planet. The object is expected to remain under Earth's gravitational influence through December. It should then break away, most likely around the end of the year or in early January 2027, and continue along its own solar orbit.
Earth may have more than one temporary moon
2026 QQ8 is not the first small object to become a temporary satellite of Earth. Astronomers have previously identified objects such as 2020 CD3 and 2024 PT5, which spent limited periods in Earth's gravitational neighbourhood before moving away. A 2025 study published in the journal Icarus suggested that Earth could have an average of around six lunar-origin mini-moons at any given time. These objects may be fragments blasted off the Moon when asteroids strike its surface. The researchers estimated that such temporary companions could typically remain around Earth for approximately nine months, although the prediction carries considerable uncertainty. Research presented at the Europlanet Science Congress in 2026 also suggested that the largest mini-moon around Earth at any given moment may typically be only about 75 centimetres across. A space rock measuring around three metres could potentially remain captured for 10 to 20 years under suitable conditions. Finding these objects is difficult because they are small, faint and often move rapidly across the sky. Their brief stays also make them challenging targets for astronomers. Improved telescope surveys and follow-up observations are helping scientists identify more of these temporary visitors. The distinction between a mini-moon and a quasi-moon is important, too. A mini-moon is genuinely held temporarily by a planet's gravity. A quasi-moon, by contrast, travels around the Sun on an orbit that makes it appear to accompany Earth, but it is not gravitationally bound to our planet. For now, 2026 QQ8 is a short-lived addition to Earth's neighbourhood. It is too small and distant to be a spectacular sight in the night sky, but its capture offers astronomers another opportunity to study the small objects that move through the region around our planet. By early 2027, the tiny visitor is expected to have slipped free of Earth's gravitational hold and resumed its journey around the Sun.
