Asteroid

google

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early 19th century: from Greek asteroeidēs ‘starlike’, from astēr ‘star’.

wiktionary

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Borrowed from Ancient Greek ἀστεροειδής(asteroeidḗs), from ἀστήρ(astḗr, “star”) + εἶδος(eîdos, “form”).

aster +‎  -oid Coined by William Herschel, terming these objects "star-like" 

etymonline

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asteroid (n.)

"one of the planetoids orbiting the sun, found mostly between Mars and Jupiter," 1802, coined probably by German-born English astronomer William Herschel (1738-1822) from Greek asteroeides "star-like," from aster "star" (from PIE root *ster- (2) "star") + -eidos "form, shape" (see -oid). Related: Asteroidal.