C/2023 RN3 (ATLAS) is a Jupiter-family comet with a centaur-like orbit around the Sun lasting once every 32 years. It is one of many comets discovered by the Asteroid Terrestrial-impact Last Alert System (ATLAS).
References
External links C/2023 RN3 at the JPL Small-Body Database C/2023 RN3 at Seiichi Yoshida's website