Showalter was examining Hubble Space Telescope (HST) images of Neptune's ring arcs from 2009 using a technique similar to panning to compensate for orbital motion when, on 1 July 2013, he chanced on the "fairly obvious dot" that represented the new moon.
Showalter was examining Hubble Space Telescope (HST) images of Neptune's ring arcs from 2009. Showalter was using a technique similar to panning to compensate for orbital motion when he chanced on the "fairly obvious dot" that represented the new moon. This was on 1 July 2013.