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).

He won the Gold Medal of the Royal Astronomical Society in 1929 and the Bruce Medal in 1937.

He discovered two asteroids, one of which is the Amor asteroid 1627 Ivar. The asteroid 1693 Hertzsprung is named in his honour.

Asteroids discovered: 2

1627 Ivar	September 25 1929
1702 Kalahari	July 7 1924

External links

• Bruce Medal page (http://www.phys-astro.sonoma.edu/BruceMedalists/Hertzsprung/index.html)
• Awarding of Bruce Medal: PASP 49 (1937) 65 (http://adsabs.harvard.edu//full/seri/PASP./0049//0000065.000.html)
• Awarding of RAS gold medal: MNRAS 89 (1929) 404 (http://adsabs.harvard.edu//full/seri/MNRAS/0089//0000404.000.html)

Obituaries

• AN 290 (1968) 287 (http://adsabs.harvard.edu//full/seri/AN.../0290//0000287.000.html) (one line, in German)
• AN 291 (1969) 85 (http://adsabs.harvard.edu//full/seri/AN.../0291//0000085.000.html) (in German)
• JRASC 62 (1968) 137 (http://adsabs.harvard.edu//full/seri/JRASC/0062//0000137.000.html)
• Obs 87 (1967) 298 (http://adsabs.harvard.edu//full/seri/Obs../0087//0000298.000.html) (one line)
• PASP 79 (1967) 638 (http://adsabs.harvard.edu//full/seri/PASP./0079//0000638.000.html) (one line)
• PASP 80 (1968) 50 (http://adsabs.harvard.edu//full/seri/PASP./0080//0000050.000.html) (not online)
• QJRAS 9 (1968) 337 (http://adsabs.harvard.edu//full/seri/QJRAS/0009//0000337.000.html)

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