9994 Grotius is a main belt asteroid. It orbits the Sun once every 4.15 years.Discovered on September 24 1960 by C. J. van Houten and I. van Houten-Groeneveld on photographic plates made by T. Gehrels it was given the provisional designation 4028 P-L. It was later renamed 9994 Grotius to honour Hugo Grotius.
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