Asenonn was the planet orbited by the moon Magrex. It had many easily reached resources and few native species, so the Republic mined the world. The planet also had a good, cool temperature, ideal for machinery. It was soon highly polluted and covered in mines, and its moon, which received most of the riches for processing, was an industrial ecumenopolis. Most of the native life was either relocated or adapted, but some were driven to extinction.
The planet was named after the ancient explorer who allegedly discovered it, Captain Mas Asenonn. He himself never thought it good for comfortable colonization, an opinion which was shared with the Republic when they began to strip it clean of resources.