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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 planets". Under this arrangement, the twelve planets of the rejected proposal were to be preserved in a distinction between eight classical planets and four dwarf planets.
The number of dwarf planets in the Solar System is unknown. Estimates have run as high as 200 in the Kuiper belt [1] and over 10,000 in the region beyond. [2] However, consideration of the surprisingly low densities of many large trans-Neptunian objects, as well as spectroscopic analysis of their surfaces, suggests that the number of dwarf planets may be much lower, perhaps only nine among ...
Former dwarf planet candidates (4 P) S. 120347 Salacia (3 P) V. 174567 Varda (2 P) Pages in category "Possible dwarf planets" The following 200 pages are in this ...
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Missions to dwarf planets in the outer Solar System necessitate careful planning and execution, with spacecraft hibernation employed specifically to conserve energy for the prolonged interplanetary journeys. This allows the spacecraft to endure the extended travel time while maintaining essential functions for navigation and communication.
For the giant planets, the "radius" is defined as the distance from the center at which the atmosphere reaches 1 bar of atmospheric pressure. [ 11 ] Because Sedna and 2002 MS 4 have no known moons, directly determining their mass is impossible without sending a probe (estimated to be from 1.7x10 21 to 6.1×10 21 kg for Sedna [ 12 ] ).
List of exoplanets discovered before 2000 (31); List of exoplanets discovered between 2000–2009 (377); List of exoplanets discovered in 2010 (109); List of exoplanets discovered in 2011 (179)
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.