Southern Cross

April 19, 2004

Southern_cross copy

Provided and copyright by: Fabiano Diniz, Federal University of Parana
Summary authors & editors: Fabiano Diniz; Jim Foster

This photo, taken in late February, shows the constellation of the Southern Cross (Crux), at the top center of the image, as viewed from Gramado Town in southern Brazil. The night sky was clear and moonless. Stars down to a magnitude 9 or so are shown, including some deep sky nebulosity. Crux is a southern circumpolar constellation -- comparable in declination or latitude to Ursa Major (Big Dipper) in the Northern Hemisphere.

The Southern Cross is indeed a brilliant constellation, consisting of several bright gems in the shape of a cross -- more or less. The brightest is Alpha Crucis (magnitude of 1.1), which is actually a triple star system. One of the stars is about 650 times as bright as our Sun and another is almost 1,000 times as bright. Beta Crusis (magnitude 1.5) is a blue star, and Gamma Crusis, at the head of the cross, is an orange colored second magnitude star. The star denoting the right-most corner on the cross (Delta Crusis) is the faintest of the four (third magnitude). Perhaps only the magnificent Orion has three bright stars that appear to be so close to each other.

Photo details: Total exposure was 1 minute 25 seconds at f 1.9, using a 50mm lens.

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