Asteroid 21621, Sherman, was discovered on May 20, 1999 by the Lincoln Laboratory Near-Earth Asteroid Research (LINEAR) Team at Socorro, New Mexico. It has a period of 3 years, 260 days and is slightly over 5 miles in diameter.

It was named for Ephrata, Pennsylvania high school student Eric Alan Sherman (born 1993),who won second place in the 2006 Intel International Science and Engineering Fair for his microbiology project, "Computer Analysis of the HLAHistocompatibility Complex: Identification of Bone Marrow Donor Matches,"

Eric Sherman

The influence of asteroid Sherman seems to be scorched-earth tactics, ruthless, destructive; possibly, anti-trust or anti-monopoly, microbiology, efficiency of matching. .

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