Discovered 1921 Nov. 9 by W. Baade at Bergedorf.
Named in honor of the theatrical artist Sonnenthal. Helionape is the Greek translation (Sonne = helio, Tal = nape). Adolf Ritter von Sonnenthal (1834–1909), famous actor at the Vienna Burgtheater and later director of this institution, was known world-wide by many guest performances in Europe and America. (AN 223, 247 (1925))
Named by C. Wirtz.
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