Those are the coordinates for the Ice planet, down and to the right of the Pewter Moon (X-56 Y-52).
The coordinates X73 Y83 are the location of the Ice Planet. It is guarded by three space sharks. (see related questions)
You get the coordinates by asking the queen, and they are x73 y83, x15 y15, and x83 y20.
No,you can't land on the sun. But You can land on: X73 Y83 , X15 Y15, and X83 Y20.