AMERICAN ASTRONOMER WHO SPECIALIZED IN THE STUDY OF DOUBLE STARS, OF WHICH HE DISCOVERED MORE THAN 3000
ROBERT GRANT AITKEN (1865-1951) SIGNED CARD, “Greetings from the Lick Observatory, Robert G. Aitken, Nov. 12, 1924”, on a card 4.25 x 3.5, by the American astronomer who was an astronomer and Director of the Lick Observatory and is known for his systematic study of double stars, measuring their positions and calculating their orbits around one another. By 1931 he had discover 3100 new binary stars. The results were published in 1932 and entitled New General Catalogue of Double Stars Within 120 [degrees] of the North Pole, with the orbit information enabling astronomers to calculate stellar mass statistics for a large number of stars. He also published The Birnary Stars (1916). For his work in cataloguing binary stars he was awarded the prestigious Bruce Medal in 1926. The card is in fine condition, with minor age toning.