Assertion: nebula | /r/HasProperty | differentiated by the wire micrometer
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Source sentences:
text: They are near the ear of Asterion, the northern hound; and the smaller nebula, or northern one, having the brightest nucleus, was differentiated by the wire micrometer; they are 3deg southwest of Alkaid, where the place is indicated by a line from Dubhe through Megrez, extended nearly twice that distance into the southeast beyond.