MARS OVER WATERTON LAKE Taken by Alan Dyer on July 12, 2018 @ Waterton Lakes National Park, Alberta

Bright yellow Mars approaching a close opposition in July 2018 shines over the waters of Middle Waterton Lake in Waterton Lakes National Park in southwest Alberta on the Alberta-Montana border. Mars is so bright it produces a glitter path on the water.

The Milky Way is at right. This was from Driftwood Beach, windy as always this night.

The sky is tinted green with bands of airglow, though there was a dim aurora to the north this night as well, quite unexpected.

Waterton Lakes is a World Heritage Site and a Dark Sky Preserve.

This is a stack of ten exposures for the ground to smooth noise (and blur the wind-rippled water) at f/3.2, and a single exposure for the sky at f/2.2, all 30 seconds with the Sigma 24mm Art lens and Nikon D750 at ISO 6400.