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The timeline of discovery of Solar System planets and their natural satellites charts the progress of the discovery of new bodies over history. Each object is listed in chronological order of its discovery (multiple dates occur when the moments of imaging, observation, and publication differ), identified through its various designations (including temporary and permanent schemes), and the ...
The telescope, at New Berlin Observatory (1835–1913), that discovered Neptune was an achromatic refractor with an aperture of 9 Paris inches (9.6 English inches, or 24.4 cm).
The dates listed are launch dates, but the achievements noted may have occurred some time later—in some cases, a considerable time later (for example, Voyager 2, launched 20 August 1977, did not reach Neptune until 1989).
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 ...
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 ...
Since then, the region they occupy between Mars and Jupiter is known as the asteroid belt. 1846 – Urbain Le Verrier predicts the existence and location of an eighth planet from irregularities in the orbit of Uranus. [137] 1846 – Johann Galle discovers the eighth planet, Neptune, following the predicted position gave to him by Le Verrier. [137]
At least 362 are known to date, and include the closest objects to the Sun known in the Solar System. [131] No vulcanoids, asteroids between the orbit of Mercury and the Sun, have been discovered. [132] [133] As of 2024, one asteroid has been discovered to orbit completely within Venus's orbit, 594913 ꞌAylóꞌchaxnim. [134]
Oldest known recording of Venus positions, of the Babylonian Venus tablet of Ammisaduqa (1600 BC). In the Old Babylonian period, the planet Venus was known as Ninsi'anna, and later as Dilbat. [199] The name "Ninsi'anna" translates to "divine lady, illumination of heaven", which refers to Venus as the brightest visible "star".