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 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

Honors

Awards

• Gold Medal of the Royal Astronomical Society in 1929
• Bruce Medal in 1937.

Named for him

• Hertzsprung crater on the Moon.
• Asteroid 1693 Hertzsprung .

External links

• Bruce Medal page
• Awarding of Bruce Medal: PASP 49 (1937) 65
• Awarding of RAS gold medal: MNRAS 89 (1929) 404

Obituaries

• AN 290 (1968) 287 (one line, in German)
• AN 291 (1969) 85 (in German)
• JRASC 62 (1968) 137
• Obs 87 (1967) 298 (one line)
• PASP 79 (1967) 638 (one line)
• PASP 80 (1968) 50 (not online)
• QJRAS 9 (1968) 337