In 3454 CE, a mini-sun orbiting the parent was created, with a semimajor axis of 0.22 AU and in 3460 CE start the terraforming for the satellite and finish in 3512 CE, which there by to change the class of the planet to E-Class. The first city was built in 3513 CE.
The colony have military and commercial installations including gas and raw materials.
In 5000 CE, there were 4.3 millions inhabitants according to the census.
If you like, here the pak for the terraforming system.