181997

181997 is a minor planet in the asteroid belt, located between the orbits of Mars and Jupiter. It was discovered on February 26, 1999, by the Lincoln Near-Earth Asteroid Research (LINEAR) project, a collaborative effort between the United States Air Force, NASA, and MIT. The asteroid is approximately 1.5 kilometers in diameter and has an orbital period of about 3.5 years. Its orbit is relatively stable, with a semi-major axis of 2.5 astronomical units (AU) and an eccentricity of 0.15. The asteroid's spectral type is unknown, but it is likely a C-type asteroid, which are composed of carbonaceous material and are among the most common types of asteroids in the asteroid belt. 181997 has not been visited by any spacecraft, and its physical characteristics, such as its shape and rotation period, are not well known. However, it is an interesting object for study, as it provides insights into the composition and evolution of the asteroid belt.