At first he thought it was a fixed star, but once he noticed that it moved, he became convinced it was a planet, or as he called it, "a new star".
Najprv predpokladal, že je to hviezda, avšak potom, ako zistil, že objekt sa pohybuje, bol presvedčený, že je to planéta, alebo ho nazval „nová hviezda“.