Icarus IV Spaceport was a spaceport.

In 2328, this was the point of embarkation for passengers traveling to the Ingraham B Transit Station via commercial transport. Jeff Hadjikhani and David Powell traveled on the SS Kogin. (TNG-R: "Inheritance", okudagram)

This spaceport was only mentioned in writing.
The inclusion of Icarus IV in the name suggests a connection with the comet of the same name.
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