More yet Voltron calcs.
The Yalex destroys a moon by awakening. Low end of with Saturns moon Dione, which has a diameter of 396km, and a high end of Luna, which has a diameter of 3476.2km.
(Low end)
396km/2 = 198km (198000m)
890 pixels = 396km (396000m)
1 pixel = 396000m/890 = 444.94382m...