G0798
ἄστρον
star
ἄστρον, -ου, τό [in LXX chiefly for כּוֹכָב ;] __(a) mostly in pl. (as in cl.), the stars: Luk.21:25, Act.27:20, Heb.11:12; __(b) in sing. (Xen., al.), only of some noted star; the symbol or image of a star, Act.7:43 (cf. ἀστήρ, and see MM, see word).† (AS)
Full Thayer's lexicon entry
ἄστρον — ástron
ἄστρον, ἀστρου, τό ((see ἀστήρ at the beginning), from Homer down);
1. a group of stars, a constellation; but not infrequent also
2. equivalent to ἀστήρ a star: Luk 21:25; Act 27:20; Heb 11:12; the image of a star, Act 7:43.
4 occurrences
Luke (1), Acts (2), Hebrews (1)