Notice how the expansions use qualities that tell us the Astrolabe is special: elegant, precise, mysterious.
What’s a new point of interest in your object? How might your alien technology operate? Does it have lights? Buttons? Lenses or mechanical arms? It doesn’t always have to be entirely clear what they do, or even be physical components for that matter—maybe it is making a noise, or seems to have an interesting effect.
What kind of qualities would tell the reader why it’s special?