To get there from Arturus, the coordinates are X-56 Y-52. These are technically the coordinates for the planet Poptropica, around which the Pewter Moon orbits.
The planet Poptropica has the same coordinates as the Pewter Moon : X-56 Y-52.
The missing page is under his bed at the museum, and gives the coordinates for the Pewter Moon. The rest is just the island storyline.
The Fire Planet is at coordinates X-83 Y-20, up and right from the Pewter Moon.
Those are the coordinates for the Ice planet, down and to the right of the Pewter Moon (X-56 Y-52).
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Yes, anytime you are back on the Pewter Moon.
Go to the Mordred Museum. Under the bed on the second floor is the missing journal page, with the coordinates to the Pewter Moon.
The only coordinates that you can enter (once you replace the green fuel rod) are those for the Pewter Moon, which are X-56 Y-52.
Use the UFO. (The saucer Excalibur in the mud swamp past the mill.) To use it you need to find a fuel rod and the coordinates. Once you get to the Pewter Moon you can make a new spaceship. (see related questions)
The Pewter MoonThe coordinates X-56 Y-52 are from the page under Mordred's bed. The Pewter Moon (orbiting planet Poptropica) is the only place the saucer has the fuel to reach. You cannot get to the three planets in the saucer. You can dial the coordinates in when you have replaced the broken green Fuel Rod.
x83 y49
get the fuel and put it in the rocket ship and put in 56 and 52.