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ahazred8vt t1_it9u3t3 wrote

Reply to comment by IDownvoteUrPet in As many as a fifth of all asteroids in the asteroid belt may have been formed out on the fringes of the solar system. Findings suggest that both Ryugu and the CI chondrites originate from the same region of space, and could even have shared the same parent body. by marketrent

Not an actual full size planet, no. "Ryugu is thought to have originated from a ~100 km-diameter parent body" that was warm enough to be soaking wet on the inside. Some of the rocks marinated in the hot groundwater. "After aqueous alteration, the parent body was catastrophically disrupted by an impact; part of the material re-accumulated to form a rubble pile asteroid, Ryugu."

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