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A Cassini orbiter's view of Mimas, a moon of Saturn discovered by Herschel in 1789. In 1789, shortly after this instrument was operational, Herschel discovered a new moon of Saturn: Mimas, only 250 miles (400 km) in diameter. [71] Discovery of a second moon followed, within the first month of observation. [45] [72] [73]
Oberon was discovered by William Herschel on January 11, 1787; on the same day, he discovered Uranus's largest moon, Titania. [1] [12] He later reported the discoveries of four more satellites, [13] although they were subsequently revealed as spurious. [14]
William Herschel, discoverer of Mimas. Mimas was discovered by the astronomer William Herschel on 17 September 1789. He recorded his discovery as follows: I continued my observations constantly, whenever the weather would permit; and the great light of the forty-feet speculum was now of so much use, that I also, on the 17th of September, detected the seventh satellite, when it was at its ...
Titania was discovered by William Herschel on January 11, 1787, the same day he discovered Uranus's second largest moon, Oberon. [1] [11] He later reported the discoveries of four more satellites, [12] although they were subsequently revealed as spurious. [13]
Uranus's irregular moons have elliptical and strongly inclined (mostly retrograde) orbits at large distances from the planet. [3] William Herschel discovered the first two moons, Titania and Oberon, in 1787. The other three ellipsoidal moons were discovered in 1851 by William Lassell (Ariel and Umbriel) and in 1948 by Gerard Kuiper . [1]
Sir William Herschel thought he had discovered up to six moons and maybe even a ring. For nearly fifty years, Herschel's instrument was the only one the moons had been seen with. [17] In the 1840s, better instruments and a more favourable position of Uranus in the sky led to sporadic indications of satellites additional to Titania and Oberon.
During the Apollo 17 mission in 1972 - the last time people walked on the moon - U.S. astronauts Harrison Schmitt and Eugene Cernan collected about 243 pounds (110.4 kg) of soil and rock samples ...
In 1781, William Herschel was looking for binary stars in the constellation of Taurus when he observed what he thought was a new comet. Its orbit revealed that it was a new planet, Uranus, the first ever discovered telescopically. [20] Giuseppe Piazzi discovered Ceres in 1801, a small world between Mars and