The Queen gives you the coordinates for the planets where the three space knights have gone, but for the saucer Excalibur they are too far away. The nearby moon at X-56 Y-52 is noted on the page from Mordred's journal (under his bed).
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x83 y49
The coordinates are X 11, Y 82
Go to the throne room on the second floor of the castle.
It is on the Fire Planet. The Fire Planet's coordinates are 83, 20.
What you do is when you go up into space you click on the coordinates and you follow tem
The planet Poptropica has the same coordinates as the Pewter Moon : X-56 Y-52.
You do not get or use a bucket on Astro Knights Island.
There is no treasure chest on Astro Knights Island.
The coordinates are locations (destinations) that are entered on the dials in the saucer Excalibur. When you have a new spaceship, the coordinates are displayed in the screen to tell you where you are. (see related question)
at these coordinates X:73 Y:83
you get the fuel rod and enter the coordinates then you go to astrozone and ask the alien to use a ship