Asaph Hall
American astronomer (1829–1907)
United StatesSummary
Updated 2026-05-29
Spotted Mars's two moons in 1877 and spent the rest of his career measuring orbital mechanics with obsessive precision. Asaph Hall turned a telescope toward the right place at the right time, and astronomy never let him forget it.
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Asaph Hall III was an American astronomer who is best known for having discovered the two moons of Mars, Deimos and Phobos, in 1877. He determined the orbits of satellites of other planets and of double stars, the rotation of Saturn, and the mass of Mars.
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