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13 Asterisms Southern Cross and the Pointers

13 Asterisms Southern Cross and the Pointers

With no southern hemisphere equivalent of Polaris, it is trickier to locate the south celestial pole than its northern equivalent. A native Australian showed me how to use both these asterisms together to help to pin down its location: close to the point where the two magenta lines in this image intersect. Although the south celestial pole was below the horizon from my location in Hawaii at 20ο degrees north, these navigational guideposts still clearly pointed the way south. (It actually had not occurred to me that I might see these asterisms from that far north. I essentially blundered into them while taking a last look around the horizon to see what I could recognize.) The Pointers are also the brightest two stars in the constellation, Centaurus (and the third and eleventh brightest in the entire night sky). Also in this constellation, visible as the small blurred star-like feature at the centre of the blue circle, is the most highly visible globular star cluster in the night sky, Omega Centauri. Capture details: Canon 5D camera on a fixed mount, 24-105 mm zoom lens set to 24 mm, aperture 5.6, exposure time 10 sec, ISO 3200.
Category:Scenic
Subcategory:Night Sky
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