This object is named after Dike, the Greek goddess of moral justice.

Among the first hundred numbered minor planets, 99 Dike was considered anomalously faint for over a century.

[8] This asteroid is orbiting the Sun with a period of 4.35 years and an eccentricity of 0.19.

The body spans a diameter of 69 km and it is classified as a C-type asteroid, which indicates it has a dark, carbonaceous surface.

Based upon a light curve that was generated from photometric observations of this asteroid at Pulkovo Observatory, it has a rotation period of 18.127 ± 0.002 hours and varies in brightness by 0.22 ± 0.02 in magnitude.