Aurora is on version 2.5.0 C#, available at the Aurora Forums.
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Sector Command
You have to research sector command tech before you can build a Sector Command HQ.
Building a Sector Command HQ in a colony allows you to appoint a Civilian leader as Sector Governor. One quarter of his boni, like mining or factory production, apply to all colonies in the sector, in addition to the colony's governor's boni. For example, a Sector Governor with a 20% bonus to mining will boost mineral production in all colonies in the sector by 5%.
To define sectors, click the Sectors button on the Economics window. The sector capital is where you built the HQ. There is a maximum allowed distance, measured in jumps, between the capital and other systems in the sector. Higher levels of sector command headquarters increase this distance.
A Sector Command HQ cannot be transported.