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Johann Gottfried Galle, 1880 The 9" refractor which was used to discover Neptune is at Deutsches Museum in Munich today. Position of Neptune (marked with a cross) on the date of its discovery, the September 23rd, 1846
Only after the discovery of Neptune on 23 September 1846 had been announced in Paris did it become apparent that Neptune had been observed on 8 and 12 August but because Challis lacked an up-to-date star-map it was not recognized as a planet. [1] A keen controversy arose in France and England as to the merits of the two astronomers.
From its discovery in 1846 until the discovery of Pluto in 1930, Neptune was the farthest known planet. When Pluto was discovered, it was considered a planet, and Neptune thus became the second-farthest known planet, except for a 20-year period between 1979 and 1999 when Pluto's elliptical orbit brought it closer than Neptune to the Sun, making ...
Urbain Jean Joseph Le Verrier (French: [yʁbɛ̃ ʒɑ̃ ʒozɛf lə vɛʁje]; 11 March 1811 – 23 September 1877) was a French astronomer and mathematician who specialized in celestial mechanics and is best known for predicting the existence and position of Neptune using only mathematics.
Johann Gottfried Galle, 1880 Memorial plaque in Wittenberg. Johann Gottfried Galle (9 June 1812 – 10 July 1910) was a German astronomer from Radis, Germany, at the Berlin Observatory who, on 23 September 1846, with the assistance of student Heinrich Louis d'Arrest, was the first person to view the planet Neptune and know what he was looking at.
An NIAC study of a mission to Neptune with the goal of landing, and flying from site to site, on Neptune's moon Triton. proposed [18] Trident: NASA: flyby A finalist in the Discovery program, would perform a single flyby of Neptune in 2038 and closely study its largest moon Triton. [19]
The next discovery was the inner planet Gliese 581e, also by the Observatory of Geneva and using data from the HARPS instrument, was announced on 21 April 2009. [26] This planet, at a minimum mass of 1.9 Earths, was at the time the least massive confirmed exoplanet identified around a main-sequence star.
In 1846, Lassell discovered Triton, the largest moon of Neptune, just 17 days after the discovery of Neptune itself by German astronomer Johann Gottfried Galle, using his self-built instrument. [8] [9] [10] In 1848, he independently co-discovered Hyperion, a moon of Saturn. [9] [11] In 1851 he discovered Ariel and Umbriel, two moons of Uranus.