Hadley’s Hope in James Cameron’s Aliens is located on the world designated LV-426.
LV-426 is the planetoid where the colony is established after the events of Alien. The film’s characters commonly refer to it as a remote colony world, while “Acheron” is another name associated with the location in franchise material.
The colony loses contact with Earth after investigators discover the derelict spacecraft and its alien eggs. Ripley, the Colonial Marines, and company representative Carter Burke later travel there to investigate.
LV-426 is sometimes confused with LV-223, the setting of the later film Prometheus. Both locations belong to the broader Alien universe, but Cameron’s Aliens centers on LV-426 and the colony of Hadley’s Hope.