Gaia DR2 data for 41 stars place Cyg OB3 at about 2 kpc, give a coherent mean peculiar velocity of about 22 km/s, and support Cyg X-1 membership.
The Observatory, http://adsabs.harvard.edu/abs/1955Obs....75...72A 75
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Kinematic study of the association Cyg OB3 with Gaia DR2
Gaia DR2 data for 41 stars place Cyg OB3 at about 2 kpc, give a coherent mean peculiar velocity of about 22 km/s, and support Cyg X-1 membership.