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Eris (minor-planet designation: 136199 Eris) is the most massive and second-largest known dwarf planet in the Solar System. [22] It is a trans-Neptunian object (TNO) in the scattered disk and has a high-eccentricity orbit. Eris was discovered in January 2005 by a Palomar Observatory–based team led by Mike Brown and verified
Eris (minor-planet designation: 136199 Eris) is the most massive and second-largest known dwarf planet in the Solar System. It is a trans-Neptunian object (TNO) in the scattered disk and has a high-eccentricity orbit. Eris was discovered in January 2005 by a Palomar Observatory–based team led by Mike Brown and verified later
Dwarf planet Eris, similar in size to its better-known cosmic cousin Pluto, has remained an enigma since being discovered in 2005 lurking in the solar system's far reaches. While Pluto was ...
The last major TNO, Eris, was at first considered by him, his team, NASA, and many others to be the tenth planet, [4] but the International Astronomical Union assigned it to the new classificatory category of dwarf planet. The possible dwarf planets Trujillo discovered are: Quaoar, co-discovered with Brown; Sedna, co-discovered with Brown and ...
He has been referred to by himself and by others as the man who "killed Pluto", [3] [4] [5] because he furthered Pluto's being downgraded to a dwarf planet in the aftermath of his discovery of Eris and several other probable trans-Neptunian dwarf planets. He is the author of How I Killed Pluto and Why It Had It Coming, published in 2010.
These five bodies – the three under consideration in 2006 (Pluto, Ceres and Eris) plus the two named in 2008 (Haumea and Makemake) – are commonly presented as the dwarf planets of the Solar System, though the limiting factor (albedo) is not what defines an object as a dwarf planet.
But the discovery of a planet at least 13 times Earth's mass orbiting very close to a red dwarf only 11% of the sun's mass has astronomers going back to the drawing board on planetary formation ...
Brown estimated, prior to the discovery of its satellite, that 2013 FY 27 was very likely to be a dwarf planet, due to its large size. [10] However, Grundy et al. calculate that bodies such as 2013 FY 27 , less than about 1000 km in diameter, with albedos less than ≈0.2 and densities of ≈1.2 g/cm 3 or less, may retain a degree of porosity ...