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Thursday, October 23, 2014

Sky Tonight—March 27, Use the Big Dipper to locate the Hunting Dogs

Courtesy of EarthSky
A Clear Voice for Science

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phase27 Sky Tonight—March 27, Use the Big Dipper to locate the Hunting Dogsmar27 Sky Tonight—March 27, Use the Big Dipper to locate the Hunting DogsYou can easily locate the Big Dipper in the northeast sky on these early springtime evenings. The Big Dipper is part of the constellation Ursa Major, the Greater Bear.

If you can find the Big Dipper, you can also find two Hunting Dogs seen by the ancient stargazers to be nipping at the Bear’s heels. The Hunting Dogs are a separate constellation: tiny Canes Venatici. You will need a dark sky to see these two little stars snuggled in the arc of the Big Dipper. Originally, they were called Asterion and Chara. However, the eastern star is now called Cor Coroli, or Heart of Charles, named for the patron king of the Polish astronomer Johannes Hevelius, who devised this constellation in 1690.

The most famous object in this region of the sky is M51, the Whirlpool Galaxy. It is beautiful when seen through telescopes and dramatic in photographs. Unfortunately, this galaxy is difficult or impossible to glimpse with binoculars.

However, there is another faint object at the extreme edge of Canes Venatici that your binoculars should pick up over the coming week, now that the moon has left the evening sky. This object is M3, a globular star cluster located some 48,000 light-years away. Binoculars see it as a dim blur of light, best seen with averted vision. Notice that it is situated almost midway between the bright star Arcturus and Cor Coroli.

Not sure how to find Arcturus? Remember to “follow the arc” of the Big Dipper’s handle, in order to locate this star. Use the Big Dipper, too, to find Canes Venatici the Hunting Dogs!

Moon & Vesta

by Deborah Byrd

 


Astronomy Picture of the Day from NASA/JPL

EarthSky: Space

CHANDRA Photo Album

U.S. Naval Observator Astronomical Information center

Universe Today

StarDate Online

Sky and Telescope

National Geographic

Space Com

Simostronomy Blog

Amazing Space

The York County Astronomical Society

Scope City

James S McDonnell Planetarium

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