Using a U.S. Navy telescope in 1877, Asaph Hall discovered the 2 moons of Mars & named them this
... Rather, 
they were discovered in 1877 by a keen-eyed U.S. astronomer in ... the U.S. Navy 
Corps of Mathematics, Asaph Hall, was studying Mars with the 26" "Great 
Equatorial" telescope at the U.S.