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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]
Pages in category "Discoveries by William Herschel" The following 200 pages are in this category, out of approximately 399 total. This list may not reflect recent changes .
Eventually, new moons were discovered also around Uranus starting in 1787 by Herschel, [23] around Neptune starting in 1846 by William Lassell [24] and around Mars in 1877 by Asaph Hall. [25] Further apparent discrepancies in the orbits of the outer planets led Percival Lowell to conclude that yet another planet, "Planet X", must lie beyond ...
Uranus: 7th Planet: Herschel first reported the discovery of Uranus on 26 April 1781, initially believing it to be a comet. [17]: 11 January 1787 p: 15 February 1787 Titania: Uranus III Uranus I (1787–1797) Herschel. [18] [19] He later reported four more spurious satellites. [20] Oberon: Uranus IV Uranus II (1787–1797) o: 28 August 1789 [21 ...
The William Herschel's 40-foot (12 m) telescope 1781 – Charles Messier and his assistant Pierre Méchain publish the first catalogue of 110 nebulae and star clusters , the most prominent deep-sky objects that can easily be observed from Earth's Northern Hemisphere , in order not to be confused with ordinary Solar System's comets .
Amateur astronomer William Herschel discovers the planet Uranus, although he at first mistakes it for a comet. Uranus is the first planet to be discovered beyond Saturn, which was thought to be the most distant planet in ancient times.
Telescopium Herschelii (Latin for Herschel's telescope), also formerly known as Tubus Hershelli Major, is a former constellation in the northern celestial hemisphere. Maximilian Hell established it in 1789 to honour Sir William Herschel's discovery of the planet Uranus. It fell out of use by the end of the 19th century.
Uranus is visible to the naked eye, but it is very dim and was not classified as a planet until 1781, when it was first observed by William Herschel. About seven decades after its discovery, consensus was reached that the planet be named after the Greek god Uranus (Ouranos), one of the Greek primordial deities.