Orion and the star Sirius, at left, setting in the dawn sky over the Chiricahuas on the morning of December 9, 2015. The orange

- Image ID: H63WR0
Alan Dyer / VWPics / Alamy Stock Photo
Image ID: H63WR0
Orion and the star Sirius, at left, setting in the dawn sky over the Chiricahuas on the morning of December 9, 2015. The orange star is Betelgeuse. Light from the eastern dawn illuminates the landscape. Haze added the natural star glows — no filter used here. The sky is a stack of 5 x 90 second exposures at f/2.5 with the 35mm lens and Canon 5D MkII at ISO1600, with the camera on the iOptron Sky-Tracker to keep stars from trailing. The ground is from another set of 5 similar exposures with the tracker motor off, the eliminate blurring from the camera tracker motion.
Location: The Chiricahuas, Arizona, USA