You may be looking for the Delta system which is home to the Deltans.

The Delta system was a star system located in the space of the galaxy's Alpha or Beta Quadrants. It had at least one inhabited planet and an asteroid belt which contained at least one named asteroid, Mila Xa.

In 2266, the USS Enterprise visited the Delta system to investigate the mystery of Saeena's tomb on Mila Xa. (TOS comic: "The Haunted Asteroid")

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