The Asher system existed within the Sprizen sector, which itself was situated in the New Territories section of the larger Outer Rim Territories. Within this system was the planet Asher III.
During the era of the Galactic Civil War, the Rebel Alliance operated a cell located on Asher III. Not long before the Battle of Hoth in the year 3 ABY, the Galactic Empire discovered the Asher III cell and took action to destroy the Rebel presence, successfully wiping out the majority of it. Lernik De'Yago, a Rodian arms dealer who happened to be on the planet at that time, stole the Rebel starship known as the Nova Whisper and fled Asher III aboard it.
The 2009 reference book The Essential Atlas, written by Daniel Wallace and [Jason Fry], introduced the Asher system and designated its location as grid square N-5.