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Eris
Eris
Artists conception of Eris and its Moon, Dysnomia.
Designation
Other names 136199 Eris
Pronounced 'ehris
Orbital Characteristics
Adjective Eridian
Aphelion 14.602×109 km (97.661 AU)
Semimajor axis 10.166×109 km (67.958 AU)
Orbital Period 204,624 earth days (560.23 earth years)
Average orbital speed 7,681 mph (3.4338 km/s, 12,361 km/h)
Satellites 1 (Dysnomia)
Physical Characteristics
Surface area 17,000,000 sq km
Volume Unknown
Mass (1.67 ± 0.02)×1022 kg (0.0028 Earths)
Axial tilt Unknown
Surface temperature (min) 30 K (-243 °C, -405 °F)
Surface temperature (avg) Unknown
Surface temperature (mean) 42.5 K (-230 °C. -383 °F)
Surface temperature (max) 55 K (-218 °C, -360 °F)
Other information
Population 0
Atmosphere
Surface Pressure 101.325 kPa
Composition Unknown
Habitable No, far too cold

Eris, minor-planet designation 136199 Eris, is the most massive known dwarf planet in the Solar System, and is known to orbit the Sun directly. Eris is estimated to be 27% more massive than Pluto, or about 0.27% of the Earth's mass.

Eris was discovered in 2005 by a Palomar Observatory-based team led by Mike Brown, and its identity was verified later that year.

As Eris appeared to be larger then Pluto, NASA designated Eris the tenth planet in the Solar System. This, along with the prospect of other similarly sized objects being discovered in the future, motivated the International Astronomical Union (IAU) to define the term planet for the first time. As of August 26th, 2006, Eris has been designated a 'Dwarf planet' along with other planets such as Pluto, Ceres, Haumea and Makemake.

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