3999 Aristarchus is a small main belt asteroid. It measures 8.26 km in diameter. It was discovered by Takuo Kojima in 1989. It is named after Aristarchus of Samos, the ancient Greek astronomer and mathematician.

eo:3999 Aristarko fa: fr:(3999) Aristarque it:3999 Aristarchus la:3999 Aristarchus hu:3999 Aristarchus ja: ( ) no:3999 Aristarchus nn:3999 Aristarchus pl:3999 Aristarchus pt:3999 Aristarchus sk:3999 Aristarchus sr:3999 uk:3999 vi:3999 Aristarchus yo:3999 Aristarchus