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Ejnar Hertzsprung (October 8, 1873, Copenhagen – October 21, 1967, Roskilde) was a Danish chemist and astronomer.
Additional recommended knowledge
In the period 1911-1913 with Henry Norris Russell, he developed the Hertzsprung-Russell diagram.
In 1913 he determined the distances to several Galactic Cepheid stars by statistical parallax, and was thus able to calibrate the relationship discovered by Henrietta Leavitt between Cepheid period and luminosity. In this determination he made a mistake, possibly a slip of the pen, putting the stars 10 times too close. He used this relationship to estimate the distance to the Small Magellanic Cloud.
From 1919 to 1946 Hertzsprung worked at Leiden Observatory in The Netherlands, from 1937 as director.
He discovered two asteroids, one of which is the Amor asteroid 1627 Ivar.
Named for him
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Ejnar_Hertzsprung". A list of authors is available in Wikipedia.|