Mempa system
The Mempa system was a Klingon system located in the Mempa sector, in the Beta Quadrant. ()

While tracking the whereabouts of the Klingon vessel that kidnapped , Rhys charted three possible courses, all passing near the Mempa system, as well as the nearby Morska system and Rura Penthe. ()

In 2256, this star's location was labeled on the star chart "Alpha/Beta Quadrant Overview" in the ready room aboard the . The star was located in the territory of the Klingon Empire. ()

A year later, its location was labeled on the star chart showing the trajectory of Lieutenant Spock's shuttle. ()

In 2259, the location of this system was labeled on a stellar cartography chart that was seen on the 's ready room viewscreen. This system's symbol was a red Klingon Empire logo, indicating its affiliation with the empire. () 

The system was the location of several key battles during the Klingon Civil War of 2367-2368. Forces loyal to Gowron suffered a major defeat against the House of Duras in the Mempa system during the conflict. The battle ended decisively in the Duras' favor, and Gowron's forces were sent into full retreat. Sela assured B'Etor that Gowron's forces would not be a threat in the region for some time. ()  

However, Martok's bold leadership on that day kept the battle from turning into a complete rout. Miles O'Brien, posing as a Klingon named Pahash, claimed to the  Changeling to have fought at Mempa. Ironically, in a way he had "fought" with Martok, since he had served on the , which was nearby during the Klingon Civil War, supported Gowron, and ultimately aided in exposing the Duras family. Martok, who was not entirely convinced, recalling Mempa, stating that "many noble deeds were done on that dark day." ()

In 2399, the system's location was labeled on a star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters. ()

Appendices

Background information 
According to the scripts for "Redemption" and "Redemption II", the pronunciation for Mempa was "MEM-pah".  

According to Star Trek: Star Charts (pp. 61-62) and Stellar Cartography: The Starfleet Reference Library ("Stellar Cartography", pp. 27, 30; "Federation Historical Highlights, 2161-2385"), this was a binary system with a G-class star and M-class star. According to a map of the Klingon Empire – prepared by the Scribe K'Tark for the Klingon High Council in the Year of Kahless 893 (2266) – Mempa was identified as a Klingon star.

Apocrypha 
According to the  Forged in Fire, the Mempa system was home to the humanoid  race which had been conquered by the Klingons. They were known to be experts in genetic engineering.

External link 
 

de:Mempa-System
nl:Mempa systeem
Star systems