ok, this is embarrassing but....

[BooDro82]

I saw that because I built my shipyard it allows for more objects, so do the small harvesters take up an object.
Also, I have been harvesting planets in my sector. They show to have 1Ku of CO...but when I open the planet menu it says 0u....does that mean I have harvested all of the CO and need to wait for it to regenerate?

[VanderLegion]

Also, I have been harvesting planets in my sector. They show to have 1Ku of CO...but when I open the planet menu it says 0u....does that mean I have harvested all of the CO and need to wait for it to regenerate?

Yah, small harvesters can drain a planet in the same system faster than it can regenerate. They'll keep running the harvest routes and whenever it's generated more resources the harvester will grab it and take it back to the destination.