Perrine, Charles Dillon


American-Argentine astronomer, discovered two of Jupiter’s moons, etc.



Type: Typed Sentiment Signed
Description: ” (1867-1951) American-Argentine astronomer, at Lick Observatory 1893-1909, director of Argentine National Observatory (Observatorio Astronómico de Córdoba) 1909-1936. In 1901, with George Ritchey observed the apparent superluminal motion in the nebulosity surrounding Nova Persei 1901. Discovered two moons of Jupiter, today known as Himalia (1904) and Elara (1905) – originally designated “Jupiter VI” and “Jupiter VII”, not given present names until 1975. Co-discovered lost periodic comet “18D/Perrine-Markos” and several other comets. Antonín Mrkos later named the asteroid “6779 Perrine” after him.

Promoted study of astrophysics in Argentina and pushed for construction of large Bosque Alegre telescope, completed in 1942. He remained in Argentina and died there.

Signed 2 ¼ x 3 ½ card with typed sentiment and January 19, 1950, date; date and place of birth typed on verso.”

Condition: Very good

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