Ejnar Hertzsprung
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Ejnar Hertzsprung was a Danish chemist and astronomer. He is best remembered for his role in developing the Hertzsprung–Russell diagram of stars.
Hertzsprung in 1961
Hertzsprung (right) and Karl Schwarzschild in front of the Göttingen Observatory building (1909)
Jacobus Kapteyn
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Jacobus Cornelius Kapteyn was a Dutch astronomer. He carried out extensive studies of the Milky Way. He found that the apparent movement of stars was not randomly distributed but had two preferential
Ejnar Hertzsprung
…He also discovered two asteroids, one of which is 1627 Ivar, an Amor asteroid. His wife Henrietta (1881–1956) was a daughter of the Dutch astronomer Jacobus Kapteyn. Hertzsprung died in Roskilde in 1967. The asteroid 1693 Hertzsprung was named in his honour. 1627 Ivar (25 September 1929…
Jacobus Kapteyn. Painting by Jan Veth (1921).
Jacobus Kapteyn on the occasion of his 40th anniversary as professor in Groningen. Sir David Gill in background. Painting by Jan Veth.