Asteroid 145452, Ritona (formerly provisionally designated 2005 RN43) is a Kuiper Belt object discovered by Andrew C. Becker, Andrew W. Puckett, and Jeremy M. Kubica on September 10, 2005 at Apache Point Observatory near Sunspot, New Mexico. It has a period of 269 years, 343 days.
Ritona is named for a goddess of river fords among the Treveri Celtic tribe of the Moselle river valley in France.
Francesco Schiavinotto has proposed the following keywords for Ritona's astrological influence: Compassionate concern for the oppressed, the weak and the persecuted; legacy of human solidarity; dereliction of duty; noncompliance with procedural rules; misbehavior; malingering; straggling; criminal or civil negligence; malpractice; recklessness.