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Ceres (minor-planet designation: 1 Ceres) is a dwarf planet in the middle main asteroid belt between the orbits of Mars and Jupiter. It was the first known asteroid , discovered on 1 January 1801 by Giuseppe Piazzi at Palermo Astronomical Observatory in Sicily , and announced as a new planet .
By far the largest object within the belt is the dwarf planet Ceres. The total mass of the asteroid belt is significantly less than Pluto's, and roughly twice that of Pluto's moon Charon. The asteroid belt is a torus-shaped region in the Solar System, centered on the Sun and roughly spanning the space between the orbits of the planets Jupiter ...
This list includes few examples since there are about 589 asteroids in the asteroid belt with a measured radius between 20 and 49 km. [171] Many thousands of objects of this size range have yet to be discovered in the trans-Neptunian region.
Dwarf planets, other than Ceres, are plutoids that have elliptical orbits: [25] [26] [27] Ceres, 2.8 AU in the asteroid belt; Orcus 39.4 AU, Trans-Neptunian-Kuiper belt object; Pluto 39 AU, Kuiper belt (a planet until 2006) Haumea 43 AU, Kuiper belt; Makemake 45.8 AU, Kuiper belt; Eris 95.6 AU, Kuiper belt; Gonggong Scattered disc object, 34 to ...
1802 – Due their star-like apparience, William Herschel suggested Ceres and Pallas, and similar objects if found, be placed into a separate category, named asteroids, although they were still counted among the planets for some decades. [129] 1804 – Karl Ludwig Harding discovers the asteroid Juno. [130]
First likely dwarf planet visited by a spacecraft, largest asteroid visited by a spacecraft 4 Vesta: 525.4: March 29, 1807: Dawn: 2011–2012: 210: 0.76: Dawn broke orbit on 5 September 2012 and headed to Ceres, where it arrived in March 2015: First "big four" asteroid visited by a spacecraft, largest asteroid visited by a spacecraft at the ...
Ceres: 8th Planet (1801) Asteroid (1851) Dwarf planet (2006) Giuseppe Piazzi. He first announced his discovery on 24 January 1801, in letters to fellow astronomers. [27] The first formal publication was the September 1801 issue of the Monatliche Correspondenz. [28] 1840s o: 23 September 1846 p: 13 November 1846 Neptune: 13th Planet (1846) [a]
The Kuiper belt, sometimes called the Edgeworth–Kuiper belt, is a region of the Solar System beyond the planets extending from the orbit of Neptune (at 30 AU) [37] to approximately 55 AU from the Sun. [38] It is similar to the asteroid belt, although it is far larger; 20 times as wide and 20–200 times as massive.