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G79.3+0.3 is an infrared dark cloud in the Cygnus-X complex that is home tomassive deeply embedded young stellar objects (YSOs). We have produced asubmillimeter array (SMA) 1.3 mm continuum image and $^{12}$CO line maps of theeastern section of G79.3+0.3 in which we detect five separate YSOs. We haveestimated physical parameters for these five YSOs and others in the vicinity ofG79.3+0.3 by fitting existing photometry from Spitzer, Herschel, andground-based telescopes to spectral energy distribution models. Through thesemodel fits we find that the most massive YSOs seen in the SMA 1.3mm continuumemission have masses in the $5 - 6M_{sun}$ range. One of the SMA sources wasobserved to power a massive collimated $^{12}$CO outflow extending at least0.94pc in both directions from the protostar, with a total mass of0.83$M_{sun}$ and a dynamical timescale of 23kyr.

Massive Young Stellar Objects and Outflow in the Infrared-Dark Cloud G79.3+0.3