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Using a new telescope astronomer William Herschel discovered the Saturnian moon Enceladus OTD in 1789. Named after the giant Enceladus of Greek mythology, for nearly 200 years little more was learned until the fly-by missions of Voyager 1 & 2 and more recently from Cassini.
https://twitter.com/aisoffice/status/1696064303625838849
le 19 septembre 1848, il y a donc exactement 175 ans, les astronomes américains William C. Bond (1789-1859) et son fils George P. Bond (1825-1865) découvrent Hyperion - découvert également et indépendamment 2 jours plus tard par l'anglais William Lassell (1799-1880)
https://twitter.com/spacemen1969/status/1704018986529386749
#OTD 23 September 1846, #Neptune was observed by German astronomer Johann Gottfried Galle, confirming Urbain Jean Joseph Le Verrier's mathematical prediction of the planet's existence. Neptune had been observed many times in the past but not recognised 👉https://en.wikipedia.org/wiki/Discovery_of_Neptune
https://twitter.com/ESA_History/status/1705535730787778600
#OTD in 1846, Neptune's largest moon Triton was discovered. It is the only large moon in our solar system that orbits in the opposite direction of its planet's rotation. Learn more: https://science.nasa.gov/neptune/moons/triton/This photo of Triton was taken by Voyager 2 in 1989.
On this day in 1977, small solar system body Chiron was discovered by Charles Kowal. Chiron is currently classified as both a minor planet and a comet and scientists believe that it could have rings (as shown in this artist rendering). More stats: https://s.si.edu/47jeb9D