It was discovered on 27 January 1990, by Japanese amateur astronomers Kin Endate and Kazuro Watanabe at the Kitami Observatory on Hokkaidō, Japan.
In December 2007, two rotational lightcurve of Erimomisaki were obtained from photometric observations by international collaboration between astronomers Silvano Casulli, Russel Durkee, Caleb Boe, Fiona Vincent and David Higgins.
[9][10] Lightcurve analysis gave a longer-than-average rotation period of 24.233 and 24.26 hours with a brightness amplitude of 0.42 and 0.27 magnitude, respectively (U=2/3-).
[4][5][6][7] CALL generically assumes a carbonaceous albedo of 0.057 and consequently calculates a much larger diameter of 16.81 kilometers based on an absolute magnitude of 12.6.
[8] This minor planet was named after Cape Erimo (Japanese: Erimo-misaki) at the south end of Hokkaidō, Japan.