The star system where Nick Locarno gathered his Nova Fleet behind a Trynar shield in 2381, and where a Genesis Device created a new planet.
The Detrion system is the setting for most of Old Friends, New Planets, the fourth-season finale of Lower Decks. Nicholas Locarno has assembled the ships seized from several powers by their mutinous junior crews into what he calls Nova Fleet, and he shelters them there behind a Trynar shield that no vessel can pass.
Mariner, held aboard his station, steals the black-market Genesis Device with which he means to deter attack and leads the fleet on a chase in the USS Passaro. The Cerritos, ordered not to intervene, arrives anyway and breaks through the shield by ramming it with an Orion warship won by Tendi.
Locarno dies trying to disarm the device, and its detonation turns debris in the system into a living world. The planet is named Locarno.