New Dwarf Planet Beyond Pluto Discovered

Astronomers have discovered another dwarf planet in the Kuiper Belt, the ring of icy objects beyond Neptune. But this newfound world, dubbed 2015 RR245, is much more distant than Pluto, orbiting the sun once every 700 Earth years, scientists said. (Pluto completes one lap around the sun every 248 Earth years.) You can see an animation of the new dwarf planet’s orbit here.


“The icy worlds beyond Neptune trace how the giant planets formed and then moved out from the sun,” discovery team member Michele Bannister, of the University of Victoria in British Columbia, said in a statement. “They let us piece together the history of our solar system.”
“But almost all of these icy worlds are painfully small and faint; it’s really exciting to find one that’s large and bright enough that we can study it in detail,” Bannister added.
The exact size of 2015 RR245 is not yet known, but the researchers think it’s about 435 miles (700 kilometers) wide. Pluto is the largest resident of the Kuiper Belt, with a diameter of 1,474 miles (2,371 km).

The research team first spotted 2015 RR245 in February of this year, while poring over images that the Canada-France-Hawaii Telescope in Hawaii took in September 2015 as part of the ongoing Outer Solar System Origins Survey (OSSOS).

“There it was on the screen — this dot of light moving so slowly that it had to be at least twice as far as Neptune from the sun,” Bannister said.

OSSOS has discovered more than 500 objects beyond Neptune’s orbit, but 2015 RR245 is the first dwarf planet that the survey has found, the scientists said.

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