25391

25391 is a minor planet in the outer region of the asteroid belt, orbiting the Sun between Mars and Jupiter. It was discovered on September 29, 1999, by the Lowell Observatory Near-Earth-Object Search (LONEOS) at Anderson Mesa Station in Arizona. The asteroid is classified as a main-belt asteroid, with a semi-major axis of approximately 3.1 astronomical units (AU), a perihelion distance of 2.7 AU, and an aphelion distance of 3.5 AU. Its orbital period is about 5.5 Earth years.

25391 has a relatively small diameter, estimated to be around 4.5 kilometers. Its rotation period is approximately 5.5 hours. The asteroid's spectral type is X, which indicates a primitive composition, likely consisting of carbonaceous material. This type of asteroid is believed to be remnants from the early solar system, providing valuable insights into the formation and evolution of the solar system.

The asteroid's name, 25391, is its provisional designation in the Minor Planet Center's system. As of now, it does not have an official name. The process of naming minor planets typically involves a proposal from the discoverer, which is then reviewed and approved by the International Astronomical Union's Working Group for Small Bodies Nomenclature.