21288

21288 is a minor planet in the asteroid belt, located between the orbits of Mars and Jupiter. It was discovered on September 24, 1960, by the Indiana Asteroid Program at Goethe Link Observatory in Indiana, United States. The asteroid is classified as a main-belt asteroid, with a semi-major axis of approximately 2.7 astronomical units (AU). Its orbital period is about 4.5 Earth years, and it has an eccentricity of 0.13. The asteroid's absolute magnitude is 13.0, which corresponds to a diameter of roughly 10 kilometers, assuming an albedo of 0.15. The rotation period of 21288 is not well-determined, but it is estimated to be around 12 hours. The spectral type of 21288 is not definitively known, but it is likely to be an S-type asteroid, which are composed mainly of silicate materials. The asteroid's name is not yet assigned, and it is currently known by its provisional designation, 21288.