51 Pegasi B

51 Pegasi-B System was a star system on the fringes of UNSC controlled space. It had two stars, 51 Pegasi-B, and 85 Pegasi-194A. It was also home of the small world of Pegasi Delta.

The Covenant constructed a massive refinery on the planet of Pegasi Delta. Serving as a supply station, the system was to be a Covenant forward staging post for incursions into UNSC space, as Covenant ships would come here and refuel, resupply, and gather to attack the enemy. In 2545, the Spartan-III Beta Company was sent on an attack on this facility, Operation: TORPEDO. Though they successfully destroyed the facility, 296 of the 300 Spartans in Company Beta were massacred in a suicidal frontal assault except for Min-B174 in an explosives accident and Adam-B004 who died when the facility exploded leaving only Lucy-B091 and Tom-B292.

51 Pegasi is an actual star, within the constellation Pegasus, with the planet [55 Pegasi b orbiting it.