Make an object rotate around other from the impact point?

So.. I have an 'static' object just spinning (I will call it earth for better understanding), and other that goes on its direction (comet).

I have this math that almost do what I want:

When the comet hits earth:

Set X to CenterX + cos(angle) * dist

Set Y to CenterY + sin(angle) * dist

But with this method, the comet don't start to rotate around earth from the impact point, but it teleports to the angle that earth is facing...

How can I make it work properly?

Bump

dont know if its exactly this what you want

https://dl.dropboxusercontent.com/u/231 ... earth.capx

dont know if its exactly this what you want

https://dl.dropboxusercontent.com/u/231 ... earth.capx

Hey man, that's exactly what I need!

Thank you! <img src="{SMILIES_PATH}/icon_e_smile.gif" alt=":)" title="Smile">