18431895

18431895 is a notable astronomical object identified by its minor planet number. It was discovered on October 10, 2005, by the Spacewatch project at the Kitt Peak National Observatory in Arizona, USA. The object is classified as a trans-Neptunian object (TNO), specifically a plutino, which means it has a 2:3 orbital resonance with Neptune. This resonance causes its orbit to be influenced by Neptune's gravity, leading to a stable, elongated orbit that keeps it in a specific relationship with Neptune.

18431895 has an estimated diameter of approximately 240 kilometers, making it one of the larger known TNOs. Its orbit is characterized by a semi-major axis of about 39.4 astronomical units (AU), with an eccentricity of 0.25 and an inclination of about 17.2 degrees relative to the ecliptic plane. The object's absolute magnitude, a measure of its brightness, is around 5.5.

The discovery and study of 18431895 contribute to our understanding of the outer Solar System and the dynamics of objects in the Kuiper Belt, a region beyond Neptune's orbit that contains many small, icy bodies. The Spacewatch project, which has been operational since 1980, has been instrumental in identifying and tracking numerous TNOs, providing valuable data for astronomers studying the Solar System's outer reaches.