51 Pegasi B

51 Pegasi-B is a planet located in a star system on the fringes of UNSC-controlled space, orbiting 51 Pegasi, and is close to 85 Pegasi-194A. It is also home to the small moon of Pegasi Delta.

The Covenant constructed a massive refinery on the planet's moon, 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 during Operation: TORPEDO. Though they successfully destroyed the facility, 298 of the Spartans were killed in the battle, leaving only Lucy-B091 and Tom-B292 alive.

Trivia
The planet 55 Pegasi b and the star 51 Pegasi exist in real life, within the constellation Pegasus, 50.1 light years from Earth. 51 Pegasi b was the first ever planet discovered orbiting a sun-like star.

List of appearances

 * Halo: Ghosts of Onyx