9998 ISO is a main belt asteroid. It completes one solar orbit every 3.18 years.Discovered on March 25 1971 by C. J. van Houten & I. van Houten-Groeneveld on archival images taken by T. Gehrels the body was given a provisional designation of 1293 T-1. It was later renamed 9998 ISO to honour the Infrared Space Observatory.
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