It's just another Kuiper Belt object.

它只是柯伊伯带天体的一员。

youdao

So far there are just five confirmed dwarf planets, including the most famous Kuiper Belt object, Pluto.

目前只有5颗小行星被确认为矮行星，包括柯伊伯带里最有名的星体——冥王星。

youdao

After a year of studying Vesta, Dawn is scheduled to leave orbit and, in 2015, approach the only asteroid-belt object that is larger: Ceres.

一年后，黎明号探测器将离开灶神星的轨道，计划在2015年到达谷神星，它是小行星带中唯一一颗比灶神星大的小行星。

youdao

It will linger at Vesta, the second most massive object in the asteroid belt, until next summer, when it is scheduled to depart for a larger asteroid called Ceres.

WSJ: Asteroid Vesta Gets a Close Study

Bill Cooke, head of NASA's Meteoroid Environment Office, said scientists believe the object originated in the asteroid belt between Mars and Jupiter.

CNN: Planet of sound: Meteor blast resonated around Earth

Abell says the best estimates now are that the Russian object was initially a rocky silicate asteroid that almost certainly originated from the main asteroid belt.

FORBES: NASA Eager To Analyze Russian Meteor Fragments