segunda-feira, 23 de janeiro de 2017

Astronomy picture of the day - 2017 January 23 - Winter Hexagon over Manla Reservoir

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Winter Hexagon over Manla Reservoir 
Image Credit & Copyright: Jeff Dai (TWAN)
Explanation: If you can find Orion, you might be able to find the Winter Hexagon. The Winter Hexagon involves some of the brightest stars visible, together forming a large and easily found pattern in the winter sky of Earth's northern hemisphere. The stars involved can usually be identified even in the bright night skies of a big city, although here they appeared recently in dark skies above the Manla Reservoir in TibetChina. The six stars that compose the Winter Hexagon are AldebaranCapellaCastor (and Pollux), ProcyonRigel, and Sirius. Here, the band of our Milky Way Galaxy runs through the center of the Winter Hexagon, while the Pleiades open star cluster is visible just above. TheWinter Hexagon asterism engulfs several constellations including much of the iconic steppingstone Orion.