212131

212131 is a numbered minor planet of the main asteroid belt. The object was first observed on 12 September 2016 by the Pan-STARRS 1 survey at Haleakala Observatory in Hawaii. The initial discovery designation was 2016 NN20, and the asteroid was later given the permanent number 212131 in 2019 after its orbit had been confirmed by multiple observations over a four‑year arc.

The orbit of 212131 lies within the outer region of the inner main belt, with a semi‑major axis of 2.45 astronomical units, an eccentricity of 0.18, and an inclination of 2.5 degrees to the ecliptic plane. As of the latest ephemeris in 2024, its orbital period is approximately 3.84 years. The asteroid has an estimated diameter of about 3.4 kilometers, based on a visual absolute magnitude of 16.4 and an assumed albedo of 0.20 typical for S‑type asteroids. Its spectral classification is not yet determined, but preliminary photometric data suggest it may belong to the stony (S) class.

The Minor Planet Center assigned 212131 the individual designation, but no official name has been published. It is currently listed in the JPL Small‑Body Database, with a well‑determined orbit and a quality rating of Q2. The object has not been the target of any directed spacecraft missions or significant scientific investigations to date.