The Ejnar Hertzsprung reference article from the English Wikipedia on 24-Jul-2004
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Ejnar Hertzsprung

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Ejnar Hertzsprung (October 8, 1873, Copenhagen - October 21, 1967, Roskilde) was a Danish chemist and astronomer. Along with Henry Norris Russell, he developed the Hertzsprung-Russell diagram (1910). Hertzsprung received the 1937 Bruce Medal.

Discovered two asteroids, one of which is the Amor asteroid 1627 Ivar.

Asteroids discovered: 2
1627 Ivar September 25 1929
1702 Kalahari July 7 1924