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Audouin Dollfus
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In full:
Audouin-Charles Dollfus
Born:
November 12, 1924, Paris, France
Died:
October 1, 2010, Versailles (aged 85)
Subjects Of Study:
solar system
Janus
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Audouin Dollfus

French astronomer
Also known as: Audouin-Charles Dollfus
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Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
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•History

Audouin Dollfus (born November 12, 1924, Paris, France—died October 1, 2010, Versailles) was a French astronomer, successor to Bernard Lyot as the principal French authority on the solar system.

Dollfus made several balloon flights for high-altitude observations, including the first stratospheric ascension in France. On the basis of comparative light-polarizing qualities, he concluded that the surface material of Mars consists of pulverized limonite (an iron oxide, Fe2O3) and prepared a map of Venus showing what he believed to be permanent features. On December 15, 1966, he discovered Saturn’s 10th known satellite, Janus.

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