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News for Norther Colorado and the world

Wednesday, September 17, 2014

Posts Tagged ‘apparent visual magnitude’

Sky Tonight—March 26, Is Sirius the most luminous

Sky Tonight—March 26, Is Sirius the most luminous star in the sky?

Courtesy of EarthSky A Clear Voice for Science Visit EarthSky at www.EarthSky.org Look southward at dusk and nightfall, and you can’t miss Sirius, the brightest star in the nighttime sky. Mia asks, “Isn’t there a brighter star in absolute magnitude which appears dimmer because of its distance?” Yes, Mia, you are right. Sirius, in the constellation Canis Major (the Greater Dog), looks extraordinarily bright in Earth’s sky because it is only 8.6 light-years away. Many stars on ... Full Story

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