19817

19817 is a main-belt asteroid, classified as a carbonaceous C-type asteroid, discovered on September 26, 1999, by the LINEAR project at the Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico. It is approximately 3.6 kilometers in diameter and orbits the Sun in the main asteroid belt at a distance of about 2.2 to 3.2 astronomical units. The asteroid's orbit has an eccentricity of about 0.2 and an inclination of about 10 degrees with respect to the ecliptic.

19817 has an absolute magnitude of about 13.6, which means it is relatively faint and would be difficult to observe with the naked eye. Its spectral type is C, indicating that it is rich in carbonaceous material. The asteroid's rotation period is estimated to be around 10.5 hours.

19817 was named after the Lincoln Near-Earth Asteroid Research (LINEAR) project, which is a collaborative effort between the Massachusetts Institute of Technology, the University of Arizona, and the Smithsonian Astrophysical Observatory. The project is dedicated to the discovery and study of near-Earth asteroids, which are potentially hazardous to Earth.

The asteroid's designation, 19817, reflects its discovery year and sequence number. It is one of the many thousands of asteroids that have been discovered in the main asteroid belt, providing valuable data for studies of the early solar system and the formation of planets.