Asaph Hall

Asaph Hall

Asaph Hall

In 1877 the American astronomer Asaph Hall discovered the Martian moons, Phobos and Deimos, while working at the United States Naval Observatory.

He later studied the satellites of Saturn, Uranus and Neptune, as well as the orbits of double stars.

Photo: Asaph Hall (USNO)

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Asaph Hall

About Asaph Hall

A careful observer discovers Mars's moons.

About Asaph Hall

Asaph Hall III (October 15, 1829 – November 22, 1907) was an American astronomer who is most famous for having discovered the 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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