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News for Norther Colorado and the world

Thursday, October 23, 2014

Sky Tonight—April 23, Two stars lead to constellation Hercules

Courtesy of EarthSky
A Clear Voice for Science

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phases r 18 Sky Tonight—April 23, Two stars lead to constellation Herculesapr23 Sky Tonight—April 23, Two stars lead to constellation HerculesThe constellation Hercules the Kneeling Giant can be seen ascending in the east-northeast on these spring evenings. Our chart today shows the sky for late night, when all of these objects are well up in the northeastern to eastern sky.

The stars Arcturus and Vega can help you identify Hercules, whose most noticeable pattern is a squarish figure in the center of the constellation. This sky pattern, or “asterism,” is known as the Keystone in Hercules.

The Keystone is a helpful pattern for more reasons than one. First, it is noticeable on the sky’s dome, so can lead your eye to Hercules. In addition, the Keystone in Hercules can help you find the most fascinating telescopic object within the boundaries of this constellation. This object is a globular star cluster. Known to stargazers as M13 or the Great Cluster in Hercules, it is barely visible the eye alone in the darkest of skies.

More on M13: Great cluster in Hercules

Binoculars show M13 as a nebulous patch. However, telescopes show stars both on the periphery of the cluster and toward its center. For a picture of M13 from the NOAO Image Gallery, look here.

This beautiful object is one of the galaxy’s oldest inhabitants. It is a tightly packed spherical collection of about one million stars.

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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