How many colonies can be put into a sector?

So far I've planned on only putting as many colonies into one sector as my directly controlled planets allowed (i.e. if I can control 5 colonies directly, I only put 5 colonies in a sector).

Is this actually correct or is there no limit for sector size or even a fixed one independent from the directly controllable planets statistic?

I'm talking about an effective limit here without incurring penalties.

Solution 1:

Currently there isn't a limit to how many planets can be in a sector.

That said sector governor AI will not manage sector very well. Hopefully will be better eventually with more work on AI. This info is current for 1.02 Hotfix.

So you just have to find a balance between how many planets per sector vs one large single sector.

You many want a sector dedicated to research. One dedicated to mineral production etc...