William Lassell (June 18, 1799 – October 5, 1880) was a British astronomer, born in Bolton, Lancashire, England. June 18 is the 169th day of the year in the Gregorian Calendar (170th in leap years), with 196 days remaining. ... 1799 was a common year starting on Tuesday (see link for calendar). ... October 5 is the 278th day of the year in the Gregorian Calendar (279th in Leap years). ... Year 1880 (MDCCCLXXX) was a leap year starting on Thursday (link will display the full calendar). ... An astronomer or astrophysicist is a person whose area of interest is astronomy or astrophysics. ... Statistics Population: 139,403 Ordnance Survey OS grid reference: SD715095 Administration Metropolitan borough: Bolton Metropolitan county: Greater Manchester Region: North West England Constituent country: England Sovereign state: United Kingdom Other Ceremonial county: Greater Manchester Historic county: Lancashire Services Police force: Greater Manchester Ambulance: North West Post office and telephone Post... Lancashire is a county in North West England, bounded to the west by the Irish Sea. ... Motto: (French for God and my right) Anthem: God Save the King/Queen Capital London (de facto) Largest city London Official language(s) English (de facto) Unification    - by Athelstan AD 927  Area    - Total 130,395 km² (1st in UK)   50,346 sq mi  Population    - 2006 est. ...

He made his fortune as a beer brewer, which enabled him to indulge his interest in astronomy. He built an observatory near Liverpool with a 24-inch reflector telescope, for which he pioneered the use of an equatorial mount for easy tracking of objects as the earth rotates. He ground and polished the mirror himself, using equipment he also constructed himself. A 16th century brewer A 21st century brewer This article concerns the production of alcoholic beverages. ... A giant Hubble mosaic of the Crab Nebula, a supernova remnant. ... Liverpool is a major city and metropolitan borough in Merseyside, England, along the eastern side of the Mersey Estuary. ... A telescope (from the Greek tele = far and skopein = to look or see; teleskopos = far-seeing) is an instrument designed for the observation of remote objects. ... An Equatorial Mount for a telescope. ...

In 1846 he discovered Triton, the largest moon of Neptune, just 17 days after the discovery of Neptune itself by German astronomer Johann Gottfried Galle. In 1848 he independently co-discovered Hyperion, a moon of Saturn. In 1851 he discovered Ariel and Umbriel, two new moons of Uranus. 1846 was a common year starting on Thursday (see link for calendar). ... Triton (trye-tÉ™n, IPA: , Greek Τρίτων), or Neptune I, is the planet Neptunes largest moon. ... Moons of the Solar System scaled to Earths Moon A natural satellite is an object that orbits a planet or other body larger than itself and which is not man-made. ... Atmospheric characteristics Surface pressure ≫100 MPa Hydrogen - H2 80% ±3. ... Johann Gottfried Galle (June 9, 1812 – July 10, 1910) was a German astronomer at the Berlin Observatory who, with help from Urbain Le Verrier, sighted Neptune on September 23, 1846. ... Year 1848 (MDCCCXLVIII) was a leap year starting on Saturday (link will display the full calendar) of the Gregorian Calendar (or a leap year starting on Monday of the 12-day slower Julian calendar). ... Hyperion (hye-peer-ee-É™n, IPA , Greek Ὑπερίων) is a moon of Saturn discovered by William Cranch Bond, George Phillips Bond and William Lassell in 1848. ... Atmospheric characteristics Atmospheric pressure 140 kPa Hydrogen >93% Helium >5% Methane 0. ... 1851 (MDCCCLI) was a common year starting on Wednesday (see link for calendar) of the Gregorian calendar (or a common year starting on Friday of the 12-day-slower Julian calendar). ... Atmospheric pressure 0 kPa Ariel (air-ee-É™l, IPA ) is a moon of Uranus discovered on 24 October 1851 by William Lassell. ... Atmospheric pressure 0 kPa Umbriel (um-bree-É™l, IPA ) is a moon of Uranus discovered on 1851-10-24 by William Lassell. ... Atmospheric characteristics Atmospheric pressure 120 kPa Hydrogen 83% Helium 15% Methane 1. ...

When Queen Victoria visited Liverpool in 1851, Lassell was the only local she specifically requested to meet. Victoria (Alexandrina Victoria; 24 May 1819 – 22 January 1901) was the Queen of the United Kingdom of Great Britain and Ireland from 20 June 1837, and the first Empress of India from 1 May 1876, until her death on 22 January 1901. ... 1851 (MDCCCLI) was a common year starting on Wednesday (see link for calendar) of the Gregorian calendar (or a common year starting on Friday of the 12-day-slower Julian calendar). ...

In 1855, he built a 48-inch telescope, which he installed in Malta because of the better observing conditions (weather) compared to Britain. 1855 was a common year starting on Monday (see link for calendar). ...

Upon his death, he left a fortune of £80,000 (equivalent of millions of American dollars by today's standards). ISO 4217 Code USD User(s) the United States, the British Indian Ocean Territory[1], the British Virgin Islands, East Timor, Ecuador, El Salvador, the Marshall Islands, Micronesia, Palau, Panama, Turks and Caicos Islands, and the insular areas of the United States Inflation 2. ...

He won the Gold Medal of the Royal Astronomical Society in 1849, and served as its president for two years starting in 1870. Gold Medal awarded to Asaph Hall The Gold Medal is the highest award of the Royal Astronomical Society. ... 1849 was a common year starting on Monday (see link for calendar). ... 1870 (MDCCCLXX) was a common year starting on Saturday (see link for calendar) of the Gregorian calendar or a common year starting on Monday of the 12-day-slower Julian calendar. ...

Lassell crater on the Moon, a crater on Mars and a ring of Neptune were named in his honour. Lassell is a small lunar crater that is located in the eastern part of the Mare Nubium. ... Apparent magnitude: up to -12. ... Tycho crater on Earths moon. ... Note: This article contains special characters. ... This is a list of the named rings and ring arcs of Neptune. ...

External links

• Biography and other topics about Lassell
• Short biography and pictures

Obituaries

• AN 98(1881) 108 (in German)
• MNRAS 41(1881) 188