5258 Rhoeo, provisional designation: 1989 AU1, is a Jupiter trojan and member of the Eurybates family from the Greek camp, approximately 53 kilometers (33 miles) in diameter.
It was discovered on 1 January 1989, by Japanese astronomer Yoshiaki Oshima at the Gekko Observatory, east of Shizuoka, Japan.
[14] On 14 May 2021, the object was named by the Working Group for Small Bodies Nomenclature (WGSBN), after Rhoeo from Greek mythology, who became the lover of Apollo and by him the mother of Anius.
[6] In April 2015, the so-far only lightcurve was obtained by Robert Stephens at the Center for Solar System Studies in Landers, California.
[6][8][a] According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Rhoeo measures 53.28 kilometers in diameter and its surface has an albedo of 0.052,[7] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 50.77 kilometers based on an absolute magnitude of 10.2.