(from the images below), it is about 17 light years across, but the best fit to a color-magnitude (HR) diagram corresponds to an apparent size of about 5 arcmin, which corresponds to about 24 light years. So although the vast majority of the cluster's stars are within 8 light years...
Stars-Open cluster-Photographic Photometry-HR diagramPhotographic V magnitudes and (B - V) colours in the UBV system are determined for 305 stars in the field of the open cluster NGC 2286, and the rms errors of V and (B - V) for one plate are estimated to be σv = 0.m063, and ...
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Spectral classification and HR diagram of pre-main sequence stars in NGC6530techniques: spectroscopicopen clusters and associations: individual: NGC 6530stars: formationHertzsprung-Russell and C-M diagramsstars: pre-main sequencestars: fundamental parameters...
A. E.SchilbachE.ASTRONOMY AND ASTROPHYSICS -BERLIN-Belikov, A., Kharchenko, N., Piskunov, A., Schilbach, E., 1999. The extremely young open cluster NGC 6611: compiled catalogue, absorption map and the HR diagram. A&AS 134, 525B....