(157491) Rüdigerkollar = 2005 RD22
Rüdiger Kollar (1925-2005) founded the Radebeul Public Observatory,
where this minor planet was discovered. Later he became director of this
Observatory and remained in that position until his retirement in 1989.
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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.