Modding Help Trying to get the coordinate of player's destination

I've been meddling with the cockpit.lua and trying to find a way to get the coordinate of systems that player clicked.

Trying to get this Nihal Cluster system's coordinate, for example.

I tried celestial.shipDestination() and coordinateSystem(toPlanet) but I haven't been successful. I'm trying to output the x and y coordinate on its own.

Any ideas?