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For the first time, we have explored the spatial substructure of the CygnusOB2 association using parallaxes from the recent second Gaia data release. Wefind significant line-of-sight substructure within the association, which wequantify using a parameterised model that reproduces the observed parallaxdistribution. This inference approach is necessary due to the non-linearity ofthe parallax-distance transformation and the asymmetry of the resultingprobability distribution. By using a Markov Chain Monte Carlo ensemble samplerand an unbinned maximum likelihood test we identify two different stellargroups superposed on the association. We find the main Cygnus OB2 group at~1760 pc, further away than recent estimates have envisaged, and a foregroundgroup at ~1350 pc. We also calculate individual membership probabilities andidentify outliers as possible non-members of the association.

Disentangling the spatial substructure of Cygnus OB2 from Gaia DR2