LV223 is the largest planetary body around a gas giant in the binary star system known as 'Zeta Reticuli' comprising of Zeta Reticuli and Zeta 2 Reticuli.
LV223 is the location where a group of archaeologists and scientists accompanied with mercenaries and mechanics journey to aboard USCSS Prometheus in search for answers to their beginnings. A planet who's location is near the star Zeta 2 Reticuli the same as LV426.
The crew of Prometheus emerge from their stases after a 2 1/2 year journey, on approach they surveyed the surface flying past mountains and canyons before choosing a landing spot on nazca line features which led towards a group of Alien Temples aligned in a row leading into the distance.
Although LV426 and LV223 are around separate Gas Giants with about a 1/7 of the diameter, LV426 is quoted as having a diameter of 1200kms (LV426 in an early Alien script was quoted as having a diameter of 120km) this would make the Gas Giant have a diameter of 8400kms, making it much smaller then Earth (12700kms), the same can be suggested for LV223.