228 Agathe is a stony main belt asteroid, about 9 kilometers in diameter. It was discovered by Johann Palisa on 19 August 1882 at Vienna Observatory, Austria. Photometric observations during 2003 showed a rotation period of 6.48 ñ 0.01 hours with a brightness variation of 0.27 ñ 0.03 in magnitude. An earlier study yielded results that are consistent with these estimates. Agathe is the lowest numbered asteroid to have an Earth-MOID as low as . On 23 August 2029 the asteroid will be from Earth.
Agathe was named after the youngest daughter of Austrian astronomer Theodor von Oppolzer (1841âÂÂ1886), professor of astronomy in Vienna.