It was discovered by Japanese astronomers Kin Endate and Kazuro Watanabe at Kitami Observatory on 16 September 1993.
[8] In August 2012, a rotational lightcurve of Kyusakamoto was obtained through photometric observations at the Palomar Transient Factory, California.
In the Mould-R filter (R), a different photometric band, the observations rendered a nearly identical period of 3.2526±0.0042 hours with an amplitude of 0.41 (U=2).
[6] According to the survey carried out by the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, Kyusakamoto measures 8.8 kilometers in diameter and its surface has a high albedo of 0.30,[4][5] while the Collaborative Asteroid Lightcurve Link assumes a stony albedo of 0.24 and calculates a slightly larger diameter of 9.0 kilometers.
[3] This minor planet was named in memory of Japanese popular singer Kyu Sakamoto (1941–1985), who died in the crash of Japan Air Lines Flight 123, the deadliest single-aircraft accident in history.