Southern Milky Way Setting & Zodiacal Light

On the eve of the November 14 total eclipse of the Sun, I was able to shoot the Milky Way setting amid the vertical glow of the evening Zodiacal Light.

This scene looks west toward the sunset point, but was taken well after sunset. The Milky Way and the area of Sagittarius where the centre of the Galaxy lies is just setting. The same area of sky contains a vertical pillar of light, very subtle, called the Zodiacal Light. This is sunlight reflected off dust particles orbiting the inner solar system and deposited by passing comets. The Zodiacal Light is best seen in the evening sky on dark moonless nights in spring, no matter what your hemisphere. But in this case it is November, spring in the southern hemisphere.

At left are the two Magellanic Clouds, satellite galaxies of the Milky Way, and visible at their best only from south of the equator. In this case we are at 16° South latitude.

The site is a lookout on the Mulligan Highway inland from Port Douglas where we made for the day before the eclipse and camped out overnight, along with a parking lot full of fellow eclipse chasers. But the morning still brought worrying clouds in the direction of the Sun, so we moved farther north to the site you see in my earlier Great Australian Eclipse blogs.

– Alan, November 20, 2012 / © 2012 Alan Dyer


Dawn’s Early Light

This shot took getting up early (rather than staying up all night) to shoot the sky at 5 a.m. The main subject here is a subtle tower of light rising up vertically from the eastern horizon. That’s the Zodiacal Light, best seen from low latitudes.

The glow is from sunlight reflected off dust particles deposited in the inner solar system by passing comets. While it looks like dawn twilight coming on, the light actually comes from out in space and heralds the brightening of the sky by true twilight.

After a week of gazing in the evening sky, a number of us observers took the opportunity this morning to snooze through part of the night and get up prior to dawn to see a new set of objects. At that time of night, and at this time of year, the centre of the Milky Way sits straight overhead, and shows up here in an ultrawide shot from horizon to zenith.

I shot this with the 15mm lens at f/2.8 and the Canon 5D MkII at ISO 800. It’s a stack of two 3-minute exposures.

– Alan, May 6, 2011 / Image © 2011 Alan Dyer