That was where it used to be. It might be that when the ASims teleported the planet/system for whatever reason it didn't update the location of it. I'd suggest going to where the galactic map says it is then head down to the planet where your inventory says it is.
Yes, the galactic map is correct. There are some issues with how we currently handle entity location that really, really doesn't like when a container is moved, as far as properly displaying in the inventory goes. That ship should be there, though, and if it's not an ASim can help.