The Size and Orbit of 2017 OF201 The newly discovered object, 2017 OF201, has a diameter of 435 miles (700 kilometers), making it smaller than Pluto, which measures around 1,477 miles (2,377 ...

In the cold, distant reaches of the Solar System, far beyond Pluto, astronomers have just identified what could be a new dwarf planet. It's called 2017 OF201, a rock that appears to be some 700 ...