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For Northern Hemisphere mid-latitude observers, the pattern known as The Winter Triangle can be seen high in the south on winter evenings. Look just east of the constellation of Orion for the triangle, which is formed by the bright stars Betelgeuse, Procyon and Sirius. The differing colors of the three stars are seen in this photo and can also be distinguished with the naked eye by a careful observer: Betelgeuse is a relatively cool red giant, Procyon is a mid-temperature yellow star, and Sirius is a hot white star.
Date: November 17, 2001
Time: 2:44 a.m. MST
Location: near Queen Valley, Arizona
Camera: Olympus OM-1 35mm SLR on homemade tracking mount
Film: Kodak P1600 slide
Focal length: 24 mm
Exposure time: 14 minutes
Scanner: Nikon Coolscan LS-2000 (slightly cropped)