100 x 45 sec, f/4, ISO160
Canon 60D, 18mm
|Image date: |
This is a seventy-five minute duration star trail image, taken from Cosmic Focus Observatory, looking North. It indicates the apparent motion of the stars around the North Celestial Pole, which is 34º below my Northern horizon.
The view looks towards the light pollution of Sydney, where the sky contrast is permanently bad, hence not a lot of stars were detected. The brightest star trail is Vega, in the constellation of Lyra and the stars towards the right belong to Cygnus. You can see some distant aircraft activity around Sydney Airport, low down on both sides of the photo.
Images like this are achieved by taking a continuous series of exposures and stacking them using one of two similar software packages Starstax or Startrails software. I usually stack them in both packages and then select the best result.
All you need is a tripod, a DSLR camera set to ‘bulb’ and an intervalometer.
It’s been a while since I took a star trail image, so here are a couple of earlier ones:
◽ Images © Roger Powell ◽
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