Yasooska was a satellite, one of four moons orbiting the planet Rodia. This celestial body existed within the Tyrius system, itself a part of the Savareen sector in the Outer Rim Territories. Its location was designated as R-16 on the Standard Galactic Grid.
The initial reference to Yasooska within Star Wars canon appeared in issue 58 of De Agostini's Star Wars: Build the Millennium Falcon magazine, dated around February 10, 2016. Prior to this, Yasooska's debut in the Star Wars Legends timeline was in Shadows of the Empire Planets Guide, a supplementary book for West End Games' Star Wars: The Roleplaying Game, released in September of 1996.