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Determining reliable distances to classical novae is a challenging butcrucial step in deriving their ejected masses and explosion energetics. Here wecombine radio expansion measurements from the Karl G. Jansky Very Large Arraywith velocities derived from optical spectra to estimate an expansion parallaxfor nova V959 Mon, the first nova discovered through its gamma-ray emission. Wespatially resolve the nova at frequencies of 4.5-36.5 GHz in nine differentimaging epochs. The first five epochs cover the expansion of the ejecta from2012 October to 2013 January, while the final four epochs span 2014 February to2014 May. These observations correspond to days 126 through 199 and days 615through 703 after the first detection of the nova. The images clearly show anon-spherical ejecta geometry. Utilizing ejecta velocities derived from 3Dmodelling of optical spectroscopy, the radio expansion implies a distancebetween 0.9 +/- 0.2 and 2.2 +/- 0.4 kpc, with a most probable distance of 1.4+/- 0.4 kpc. This distance implies a gamma-ray luminosity much less than theprototype gamma-ray-detected nova, V407 Cyg, possibly due to the lack of a redgiant companion in the V959 Mon system. V959 Mon also has a much lowergamma-ray luminosity than other classical novae detected in gamma-rays to date,indicating a range of at least a factor of 10 in the gamma-ray luminosities forthese explosions.

The Distance to Nova V959 Mon from VLA Imaging