This week astronomer Mike Brown and graduate student Emily Schaller released new results showing the Kuiper Belt object Eris is 27% more massive then Pluto (which is a few more percentage points more massive than was previously known.
Neither object is a planet. (image credit: NASA)
Here are the stats.
|Pluto||Eris||Mass||13.0×10^21 kg||16.6×10^21 kg|
|Radius||1195 km||1200 km|
|Semi-Major Axis||39.5 AU||67.7 AU|
For those of you who really really want Pluto to be a planet, please listen to this episode of Astronomy Cast before you send me angry comments.