Omega Sagitta system
The independent Omega Sagitta system, also known as Madena, was an inhabited planetary system in the Alpha Quadrant. This system contained the twin planets that formed the Coalition of Madena, Atlec and Straleb. Both worlds were populated by a humanoid race which colonized the planets in the mid-2160s, and now coexisted under a tenuous but successful treaty. By the mid-24th century, the governments of both worlds were cognizant of the Federation and their starships. The mineral tricellite was not available in this system. 

In 2259, the system's location was labeled in a stellar cartography chart seen on the 's ready room viewscreen. This system's symbol had a blue color, indicating that it was affiliated with the . ()

In 2365, the , on impulse power, traveled through the space between the twin planets. ()

In 2399, the location of Madena was labeled in a Federation star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters. This system was in or near to Ferengi space. () 

In 3189, the location of Madena was denoted on a holographic star chart of the galaxy at Federation Headquarters. ()

Appendices

Background information 
The system was initially named the Omega Twelve system, and the planets were members of the Coalition of Madena VI. 

Although Sagitta ("The Arrow") was a real constellation visible from Earth, there was no star with the prefix "omega" since standard nomenclature in this constellation ended with Eta. Furthermore, a hypothetical "omega" star in this constellation should have the name "Omega Sagittae", as the genitive of Sagitta has to be applied.

According to Star Trek: Star Charts ("United Federation of Planets I") and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the primary of the Omega Sagitta (Madena) system was a F-class star.

According to StarTrek.com, Madena was a  system in the Omega Sagitta system.

External link 
 

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Star systems