It was discovered on 2 October 1999, by American astronomer Charles W. Juels at the Fountain Hills Observatory in Arizona.
[1] Originally considered a centaur, this now re-classified Jovian asteroid has a rotation period of 9.3 hours and belongs to the 80 largest Jupiter trojans.
However, its location close to L5, its low albedo and spectral slope, as well as its estimated dynamical lifetime of more than a billion years, led to the conclusion that the formerly classified centaur is indeed a Jupiter trojan.
[12] On 14 May 2021, the object was named by the Working Group for Small Bodies Nomenclature (WGSBN), after Periboea, a mortal woman and eldest daughter of Acessamenus from Greek mythology.
[6][13][14][15] Best-rated lightcurve, obtained by Stefano Mottola at the Calar Alto Observatory over seven nights from May to June 2009, gave a rotation period of 9.2749±0.0016 hours with a brightness amplitude of 0.17 magnitude (U=2+).