Three motherships have now been entered to the global auction. You find these auctions in the Auctions UI: in the most right column, click on the drop-down list and choose "Global Auction".
These three motherships are docked outside the planet space stations. The coordinates can be found in the Items Info of the deeds.
For information on how to utilize and activate a mothership, see section Utilizing New Mothership in Space in Beginner's Guide.
When I don't harass my co-workers with yoga, I'm at the heart of things at MindArk: writing, collecting info for Release Notes, working on the web and doing other important tasks that come in my way.