A1-Q4 is the second of A1-Q's outer worlds. It is essentially a rock of unremarkable ores with some deposits of water ice, but no minerals of value. The frozen surface is composed of silica.
Like the gas giant A1-Q3, it is thought that A1-Q4 formed too close to its star and was thrown outwards by gravitational effects. Prometheus estimates it will be ejected from the system in a few hundred thousand years.