If it were little star it would be αστερίσκος (asterisk) or αστεράκι (little star). As for Asterion (Αστερίων) it could possibly be, but why not use it as it's written, well there is a film that used the word Αληθειόμετρο (alethiometer) but the actors pronounced it through the whole film as ... More @Wikipedia
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