21015

21015 is a minor planet in the asteroid belt, orbiting the Sun between Mars and Jupiter. It was discovered on September 24, 1998, by the Lincoln Near-Earth Asteroid Research (LINEAR) project. The asteroid is classified as a main-belt asteroid, with a semi-major axis of approximately 2.5 astronomical units (AU). Its orbital period is about 4.0 years, and it has an eccentricity of 0.12, indicating a relatively circular orbit.

The size of 21015 is estimated to be around 2.5 kilometers in diameter. Its spectral type is X, which suggests a primitive composition, possibly including carbonaceous materials. This classification is based on its reflectance spectrum, which shows a featureless, reddish hue typical of C-type asteroids.

21015 has not been visited by any spacecraft, and its physical characteristics, such as shape and rotation period, remain unknown. The asteroid's orbit is stable, and it does not pose any threat to Earth. Its discovery and ongoing study contribute to our understanding of the asteroid belt and the early solar system.