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The Cygnus OB2 Association is one of the nearest and largest collections ofmassive stars in the Galaxy. Situated at the heart of the "Cygnus X" complex ofstar-forming regions and molecular clouds, its distance has proven elusiveowing to the ambiguous nature of kinematic distances along this $\ell\simeq80$degree sightline and the heavy, patchy extinction. In an effort to refine thethree-dimensional geometry of key Cygnus~X constituents, we have measureddistances to four eclipsing double-lined OB-type spectroscopic binaries thatare probable members of Cyg~OB2. We find distances of $1.33\pm0.17$,$1.32\pm0.07$, $1.44\pm0.18$, and $1.32\pm0.13$ kpc toward MT91~372, MT91~696,CPR2002~A36, and Schulte~3 respectively. We adopt a weighted average distanceof 1.33$\pm$0.06~kpc. This agrees well with spectrophotometric estimates forthe Association as a whole and with parallax measurements of protostellarmasers in the surrounding interstellar clouds, thereby linking the ongoing starformation in these clouds with Cyg~OB2. We also identify Schulte 3C (O9.5V), a4" visual companion to the 4.75 day binary Schulte~3(A+B), as a previouslyunrecognized Association member.

Predicting Gaia's Parallax Distance to the Cygnus OB2 Association with Eclipsing Binaries