20309

20309 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 Brooklyn, Indiana. The asteroid is approximately 10 kilometers in diameter and has a rotation period of about 5.5 hours. It is classified as a C-type asteroid, which means it has a dark surface and is likely composed of carbonaceous material. The asteroid's orbit is relatively stable, with an eccentricity of 0.12 and an inclination of 11.5 degrees. 20309 has not been visited by any spacecraft, and its surface features remain unknown. The asteroid is named after the Indiana Asteroid Program, which was a collaborative effort between Indiana University and the U.S. Air Force to search for near-Earth objects. The program was active from 1960 to 1967 and discovered over 1,000 asteroids.