AO91

AO91 is a binary near-Earth asteroid, with a perihelion of 0.95 AU and an aphelion of 1.09 AU. Its orbit brings it close to the Sun and also crosses the orbit of Earth, hence its classification as a near-Earth asteroid. The asteroid has a binary nature, meaning it consists of two closely orbiting bodies. The primary and secondary bodies are in a synchronization with each other, with their rotation periods matching each other. This synchronization is due to tidal interactions, which have slowed down the rotation of the primary body and caused the secondary body to align with it.

AO91 is estimated to be approximately 1.2 kilometers in diameter, with an albedo (reflectivity) of about 0.2. It is thought to be composed primarily of carbonaceous chondrite material, which is a common type of meteorite. The asteroid's surface temperature varies greatly due to its close proximity to the Sun, with temperatures reaching as high as 500 Kelvin at perihelion.

AO91's orbital path is primarily dictated by its perihelion and aphelion distances. The asteroid's orbital period is approximately 1.22 years, during which it passes close to the Sun and through a perihelion asteroid belt, the Coronal Hot Zone. Its nearest approach to Earth was in 2002, when it passed within about 5 million kilometers of our planet, naturally leaving a meteoroid trail. Further studies are required to provide a more comprehensive understanding of AO91's origins, composition, and potential threats to Earth.