(391988) Illmárton = 2008 YF26 Márton Ill (1930-2015) was a Hungarian astronomer and space scientist. He established the first Hungarian satellite monitoring base at the Baja Astronomical Observatory in 1958, of which he was the director between 1966 and 1990. His main field of research was the study of the properties of the upper atmosphere.
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A complete set of naming citations of the numbered minor planets is available in the Dictionary of Minor Planet Names, edited by Lutz Schmadel.