[1] After adjusting for reddening due to interstellar dust, the distance modulus is estimated as 11.6 magnitudes.

[3] This cluster appears to be located in front of a molecular cloud, although the two are not physically associated.

This cloud has the effect of blocking background stars from the visual image of the cluster as it lies at a distance of 300 parsecs.

These are spectral class B stars that show prominent emission lines of hydrogen in their spectrum.

[2] A candidate member of the cluster, LS I +61° 235, is a Be star with an X-ray binary component that has a period of about three years.