<Tr> <Th> Absolute magnitude (H) </Th> <Td> 2999883000000000000 ♠ − 1.17 + 0.06 − 0.11 </Td> </Tr> <Tr> <Th> Angular diameter </Th> <Td> 40 milli - arcsec </Td> </Tr> <P> Eris (minor - planet designation 136199 Eris) is the most massive and second - largest dwarf planet known in the Solar System . Eris was discovered in January 2005 by a Palomar Observatory - based team led by Mike Brown, and its identity was verified later that year . In September 2006 it was named after Eris, the Greek goddess of strife and discord . </P> <P> Among known bodies of the Solar System, Eris is the ninth most massive directly orbiting the Sun, and the 16th most massive overall, because seven moons are more massive than all known dwarf planets . It is also the largest which has not yet been visited by a spacecraft . Eris was measured to be 2,326 ± 12 kilometers (1,445.3 ± 7.5 mi) in diameter . Eris' mass is about 0.27% of the Earth mass, about 27% more than dwarf planet Pluto, although Pluto is slightly larger by volume . </P>

What is the significance of the celestial object eris