The Deep Iron Star discovery can be found southeast of the piece of the Guardian wall near the Dark Rift. It is in Deep Sky, so this can only be attained after getting your ship upgraded.
Description[]
A metallic relic of the ancient world. Legend has it that the ancients once harnessed the power of the Blue Moon to be able to detect sound waves to let them know when their enemies were approaching. Perhaps this machine once served such a purpose?