Tuesday, April 11, 2017

Castle Eye View

The best known asterism in northern skies, The Big Dipper is easy to recognize, even when viewed upside down, though some might see aplough or wagon. The star names and the familiar outlines appear framed in the ruined tower walls of the French Chateau du Morimontif you just slide your cursor over the image or follow this linkDubhe, alpha star of the dipper's parent constellation Ursa Major is at the lower left. Together with beta star Merak the two forma line pointing the way to Polaris and the North Celestial Pole, hidden from view by the stones. Since the image was captured on March 30, you can follow a line from dipper stars Phecda and Megrez to spot the faint greenish glow ofComet 41P/Tuttle-Giacobini-Kresak below center, still within the castle eye view. The periodic comet made a remarkable closeapproach to planet Earth on April 1.
Image Credit & Copyright: Stephane Vetter (Nuits sacrees, TWAN)

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