21513

21513 is a minor planet in the outer region of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 24 September 1998, by astronomers of the Lincoln Near-Earth Asteroid Research team at the Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico. The asteroid is classified as a main-belt asteroid, with an orbital period of approximately 4.15 years. Its orbit has a semi-major axis of about 2.60 astronomical units (AU) and an eccentricity of 0.18. The orbital inclination is 11.3 degrees, which is relatively low compared to other asteroids in the main belt. The spectral type of 21513 is not well-determined, but it is likely to be a C-type asteroid, which are common in the outer asteroid belt and are thought to be composed of carbonaceous chondrite material. The asteroid's rotation period is not known, but it is likely to be in the range of a few hours to a few days, typical for asteroids of its size. 21513 has not been visited by any spacecraft, and little is known about its surface features or composition. However, it is an interesting object for further study, as it represents a typical example of a main-belt asteroid.