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800px-eighttnos.pngThis 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.