Assertion: asteroid's diameter | /r/HasProperty | close to modern value
Facets:
value: for the mean diameter
type: OTHER
Source sentences:
text: E.C. Pickering produced an estimated diameter of 513±17 km in 1879, which is close to the modern value for the mean diameter, but the subsequent estimates ranged from a low of 390 km up to a high of 602 km during the next century.