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Originally presented as satellite planets orbiting the planet Uranus. [15] Planetary status later rescinded, leaving them only as satellites. Oberon: 1787 1700s Ceres: 1801 1867 Asteroid and dwarf planet: The first asteroids to be discovered were accepted as planets in the Copernican system, since they directly orbited the Sun.
Indeed, the draft of Resolution 5A had called these median bodies planetoids, [32] [33] but the plenary session voted unanimously to change the name to dwarf planet. [2] The second resolution, 5B, defined dwarf planets as a subtype of planet, as Stern had originally intended, distinguished from the other eight that were to be called "classical ...
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 ...
Pluto was, however, found to be too small to have disrupted the orbits of the outer planets, and its discovery was therefore coincidental. Like Ceres, it was initially considered to be a planet, but after the discovery of many other similarly sized objects in its vicinity it was reclassified in 2006 as a dwarf planet by the IAU. [22]
2006 – The 26th General Assembly of the IAU voted in favor of a revised definition of a planet [234] and officially declared Ceres, Pluto, and Eris dwarf planets. [235] [236] 2007 – Dwarf planet Gonggong, a large KBO, was discovered by Megan Schwamb, M. Brown, and D. Rabinowitz. [237] 2008 – The IAU declares Makemake and Haumea dwarf planets.
The brightest planets in the sky have been named from ancient times. The scientific names are taken from the names given by the Romans: Mercury, Venus, Mars, Jupiter, and Saturn. Our own planet is usually named in English as Earth, or the equivalent in the language being spoken (for instance, two astronomers speaking French would call it la ...
A new distinct class of objects called dwarf planets was also decided. Pluto was redefined as a dwarf planet along with Ceres and Eris, formerly known as (2003) UB 313. Eris was named after the IAU General Assembly in 2006. [27] [28]
By RYAN GORMAN Scientists may have found Planet X -- the long-rumored object believed to be larger than Earth and further from the sun than Pluto. Planet X and another object dubbed "Planet Y ...