Assertion: nebula's star | /r/PartOf | the spectral class o5
Facets:
value: with an apparent magnitude of 6.9
type: OTHER
Source sentences:
text: The brightest star in the cluster belongs to the spectral class O5 and has an apparent magnitude of 6.9.
text: The brightest star in NGC 6530 is a hot star belonging to the spectral class O5 with an apparent magnitude of 6.9.