Try x 10, y 84. These were the cordinate that I found the asteroid at. It may not be the same for everyone. Sorry.
On Mordred's secret asteroid. The space cordinates are X-11, Y-83.
56, 52
X:83 y:20
56,52
fly southeast
TO get into the asteroid castle you have to complete the puzzle on the door.
go to the middle of the asteroid belt and it's on a asteroid go down to it.
On poptropica, when you get to the asteroid belt, if you are looking for Mordreds little castle that holds the key, go to: X 12 and Y 80. There you will find the little asteroid Mordred is hiding on.
Becuase they can be.
go through the asteroidbelt until you find a large asteroid with a giant Crystal on it.
all you have to do is go on the space ship you made in pewter moon and move to the cordinates 15 15
I'ts in center of the asteroid belt