It's NOT A SHIP!
Its a gestation pod. Judging by the debris around the central "Pod" I would imagine that it would be a casing of some kind in order to protect the pod itself. One thing is for sure - the centre of the pod looks nothing like either an observation platform, engine or weapon.
I think this is a PART of the ship responsible for the Barnacles. When I look at it, it instantly comes to mind that this is something that "Eggs" come out of.
The only question is... Where did the rest of the ship go? It must have been in a space battle that completely destroyed it. For just the pod and casing to have ended up crashing on this lonely world.
This brings to mind three questions.
1. Are the more bits of the mothership to find in system?
2. How danged big is this thing anyway?
3. Who blew it up, because for sure, the Feds etc... are fighting over barnacles. Which means they know nothing apart from that. If this is just a pod section, then something seriously advanced must have dusted it.
Uh-oh.