William Lassell

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Lassell, William


Born June 18, 1799, in Bolton, Lancashire; died Oct. 5, 1880, in Maidenhead. British astronomer-observer. Member of the London Royal Society (from 1849); president of the Royal Astronomical Society from 1870 to 1872.

In 1844–46, Lassell constructed a 2-ft reflector with the help of which he discovered in 1846 a satellite of Neptune, and in 1851, a third and fourth satellite of Uranus. In 1851 he moved to the island of Malta, where in 1861 he constructed a 4-ft reflector. In 1867, Lassell published a catalog of 600 nebulae discovered using this reflector.


[Obituary.] Monthly Notices of the Royal Astronomical Society, 1881, vol. 41, no. 4, pp. 188–91.
References in periodicals archive ?
William Lassell was one of the earliest observers to propose that R Mon was composed of a luminous knot rather than a star.
Neptune's largest moon, Triton, would be discovered just 17 days later by Lancastrian brewer and amateur astronomer William Lassell using his self-built telescope in West Derby, Liverpool.
A local brewer in the 19th century, William Lassell, used cast-iron telescopes to discover the moons of planets in the outer solar system ?
Another friend was the Liverpool brewer William Lassell (1799-1880), the discoverer of Triton, Neptune's largest moon.
Warming to her theme she adds: "Then there was William Lassell, one of Britain's greatest 19th century astronomers.
There were some remarkable characters, such as the `eagle-eyed' clergyman William Rutter Dawes; the irascible Sir James South; and William Lassell, who made his fortune in the brewery trade before turning to astronomy.
Later in 1846, the British astronomer William Lassell (1799-1880) discovered a satellite of Neptune, which he named Triton after a son of Neptune (Poseidon) in the Greek myths.
In 1862 William Lassell sketched NGC 1535 as seen through his 48-inch reflector and called it "An extraordinary and beautiful Planetary Nebula.
A third, Ariel, was found by William Lassell on 1847 Sept 14, and the fourth, Umbriel, by O.
During 1849 and 1850, both he and William Lassell noted a rare outbreak of "bright round spots" in the planet's South Temperate Belt and South Temperate Zone.
Searching for clear, transparent skies, British amateur astronomer William Lassell shipped his 48-inch equatorial reflector to the island of Malta in 1861.
After observing a transit of Callisto in 1859, British astronomer William Lassell remarked that "It was difficult to conceive that any object so dark could ever appear as a bright one.