Eris is the very same size as Pluto, however three times additional from the Sun! it’s so much away, we don’t know much about this exceptionally cold and also remote dwarf planet.

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Eris is the most far-off dwarf planet, located past the orbit of Neptune. It was found in 2005 and also was originally classified as a planet. That is the second-largest dwarf planet discovered and also it led to both it and Pluto’s demotion from planets come dwarf planets.

Key truth & Summary

Though a bit smaller than Pluto, it exceeds Pluto’s mass by around 28%.It has an median distance of 68 AU away from the Sun. Its really distance have the right to be confirm online, together Eris is constantly tracked.Its apparent magnitude the 18.7 provides it bright sufficient to be detected by amateur telescopes.It doesn’t have rings, naught is known around its magnetosphere yet it does have a moon named Dysnomia after the demon goddess that lawlessness and the daughter the Eris.It takes around 558 earth years because that Eris to do one trip approximately the Sun. As it orbits the Sun, it completes one rotation every 25.9 hours.

It was discovered by Mike Brown’s team while castle were evaluating images bring away in 2003. This discovery was publicly announced in 2005, and also it brought about problems due to the fact that it was assumed that Eris to be bigger 보다 Pluto, for this reason triggering the conflict in the scientific ar that led to the International astronomical Union’s decision in 2006 to clarify the an interpretation of a planet. Now both Pluto and Eris space termed dwarf planets.


Eris received an informal name, Xena, which was used internally by the discovery team. Supposedly the team had currently saved this name to be used by the moment a new object to be discovered, that would certainly be bigger 보다 Pluto.

Many other names were then proposed and also finally the surname Eris was given in 2006. The reason for this is since the thing was thought about a earth for a long time and thus that deserved a surname from the Greek or roman inn mythology, favor the various other planets.

Since Eris is the goddess that strife and discord, it symbolically represented the discord in the astronomical community resulted in by the controversy over the object’s and Pluto’s classification.


Eris is a member the a group of objects that orbit in a disc-like zone beyond the orbit the Neptune, referred to as the Kuiper Belt. Although, Eris is the just dwarf earth that orbits also further than this.

This much away kingdom is inhabited with thousands of miniature icy worlds, which formed beforehand in the history of our Solar System around 4.5 billion years ago.

Distance, Size and also Mass

Eris is about 68 AU far from the sun, and also presently around 95.1 AU indigenous the Earth. It takes about 13 hours for light to travel from Eris come us. These statistics constantly adjust but deserve to be confirmed online due to the fact that Eris is continuous tracked. Eris has actually a radius of about 722 mile or 1,163 kilometers, and thus it’s around 1/5 the radius of Earth. Prefer Pluto, it is a bit smaller 보다 our moon. If earth were a nickel, Eris would be the size of a popcorn kernel. It has actually a diameter of around 2,326 kilometers or 1,445 miles.

It is slightly smaller sized than Pluto, despite Eris is about 27% more massive and denser. However, new results from the new Horizons mission revealed the Pluto’s volume was no slightly smaller, however actually slightly bigger than Eris. V this brand-new information, Eris has actually been inserted as the tenth-largest object recognized to orbit the sunlight by volume, yet it remains the ninth-largest through mass.

Orbit and also Rotation 

It takes around 558 earth years because that Eris to do one trip about the Sun. As it orbits the Sun, that completes one rotation every 25.9 hours. The maximum distance or aphelion, indigenous the Sun, is about 97.65 AU when its closest or its perihelion is about 37.91 AU.

It involved its aphelion roughly the year 1977, and also it will reach the perihelion in the year 2256. That is orbit pattern have the right to be classified as very eccentric. That orbit stays clear of direct communication with Neptune’s orbit, never crossing it. Eris’s orbit is very inclined, tilted at an edge of about 44 levels to the ecliptic. The is approximated that in around 800 years, Eris will be closer to the sun than Pluto, at least for a period of time.

Structure, Surface and Atmosphere

Eris has actually an estimated albedo of 0.96, greater than any kind of other large body in the Solar System except for the sixth-largest moon that Saturn, Enceladus. The reason for its high albedo is speculated come be as result of its surface ar ices that room replenished because of temperature fluctuations together Eris’s eccentric orbit takes the closer and also father native the Sun.

Since it has actually a density of 2.52±0.07 g/cm3, the is thought that that is largely composed the rocky materials. Interior heating via radioactive decay says that Eris can have an interior ocean of fluid water at the mantle-core boundary.

The visibility of methane ice suggests that its surface ar is very comparable to that of Pluto and of Neptune’s biggest moon Triton. That is eccentric orbit is additionally one of the factors that do its surface ar temperature between about −243.2 and also −217.2 °C. Despite Pluto and Triton have actually reddish parts on your surface, Eris appears nearly white.


Eris is around three times farther far from the sunlight then Pluto. Regardless, it viewpoints close sufficient to the sunlight that few of the ices on the surface might warm enough to sublime.

Because methane is highly volatile, its visibility shows either the Eris has constantly resided in the remote reaches the the Solar System, wherein it is cold enough for methane ice cream to persist, or that the celestial body has an internal resource of methane to replenish gas the escapes native its atmosphere.


Eris has one well-known satellite, a moon the was uncovered in 2005, and also was called Dysnomia, after the daughter of the goddess Eris.


By the time of its discovery, Eris still had the nickname Xena, after a warrior princess in a TV show. The princesses’ sidekick was named Gabrielle, and also thus the moon to be nicknamed after ~ the sidekick. However, due to the fact that the IAU officially chose to name the dwarf earth Eris, its satellite’s name additionally had to be changed and thus received the surname Dysnomia.


Dysnomia is the second known biggest moon that a dwarf planet. The very first place is organized by Pluto’s moon Charon. The was uncovered after the adaptive optics team in Hawaii brought out monitorings using a newly commissioned laser guide star adaptive optics system. That is believed to have been developed after a collision.

It is speculated to be made fully out that ice. It has actually a diameter of around 700 +/- 115 km, one albedo the 0.04 +0.02/-0.01, and also a semi significant axis that 37,460 kilometers or 23,276 miles. Its virtually circular orbit lasts around 16 days. Spectrum analysis indicates it has an extremely dark colored surface, very different from Eris.

Life Habitability

Due to extreme cold temperatures, it appears unlikely that life could exist there.

Future plans for Eris

Using Jupiter’s gravity assist, it can take around 24 year to reach Eris. Since the mission to Pluto to be a success, many studies arose for follow-on goals to deeper discover the Kuiper belt, Eris to be evaluated amongst the candidates. However, there space no clear missions stated to take place, yet.

Did girlfriend know?

Eris is currently in the Cetus constellation and it will get in the Pisces constellation in 2036.Eris is about two thirds that the Moon’s diameter and also one 3rd of that volume thus all the objects in the Asteroid Belt could fit within it.It isn’t always the most distant dwarf planet. At its furthest suggest from the sun is reaches outside the Kuiper Belt, yet at its closest allude it is much closer come the sun than Pluto, as soon as Pluto is at its furthest.It is currently at that is furthest suggest away native the Sun. Because of its distance any atmosphere it could have had, would have actually frozen and also fell to the surface as snow. Yet as the will gain closer to the sunlight in about 247 years, that icy surface ar will sublimate, creating a new tenuous atmosphere.It is believed that Eris was originally located inside the Kuiper Belt, but due to gravitational interactions v Neptune, as the Solar system was forming, the dwarf earth was forced out right into the scattered disc region.Eris has actually a surface size similar to that of Russia.Standing ~ above Eris would certainly make a human feel lighter, together its heaviness is 11 times weaker 보다 that the Earth, making a human eleven times weigh less.Though its heaviness is weak compared to earth, Eris has actually the the strongest gravity the end of every the dwarf planets: 0.82 m/s².If a human would stare right into the skies from Eris, he or she would view a an extremely sharp watch of the Milky Way, and the stars, since atmosphere can not acquire in the way. The many spectacular watch would be that of its moon, Dysnomia, i beg your pardon is around 650 kilometers or 403 miles in diameter while additionally a huge advantage would be the truth that it is nice close come Eris, orbiting that is parent earth at just 37.000 kilometers or 22,990 mile away.Eris’s moon orbits ten time closer that is parent world than earth moon.

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Bibliography:Schilling, Govert (2008). The hunt For earth X. Springer. P. 214.Image source: