地球 ちきゅう近傍 きんぼう しょう惑星 わくせいであれば
chikyūkimbōshō waku seideareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 地球近傍小惑星

1. If it were a near-Earth asteroid; If it is a near-Earth asteroid

Ba Conditional
Astronomy