September 25, 2024
1 Solar System Way, Planet Earth, USA

The Magnificent Barred Spiral Galaxy Pegasus – Astronomy Now

NGC 7479 is a picturesque barred spiral seen face-on. Image: Bob Fera.

The mighty Pegasus reigns supreme on the evenings of late September and October, rightly famous for its “Grand Plaza” that stretches across The southern meridian is about 50° high at approximately 23:45 BST. NGC 7479 (Caldwell 44), popularly known as the “Helix Galaxy”, is easy to spot, lying just 3° south of Markab (alpha Pegasi), the star in the south-west (lower right) corner of the square. In late September, from London, NGC 7479 transits the southern meridian (culminates) at about 50° high at approximately 23:45 BST. Unfortunately, it is out of range with 10×50 binoculars.

Magnificent image of the Helix Galaxy taken by the Hubble Space Telescope. Image: ESA/Hubble and NASA.

NGC 7479 is a magnitude +11 object spanning 4.1' x 3.2' at its greatest extent and appearing face-on to our line of sight. It is a difficult galaxy to observe through a small telescope, although a bright core can be seen through an 80 mm (~3 inch) telescope, while a 100-150 mm (4-6 inch) telescope shows its pronounced bar surrounded by a 3' x 2' north-south oriented halo.

On a clear, stable night, some subtle spotting can be achieved, although you will need a 300mm (12 inch) aperture to be able to see the central bar.

Imagers often produce magnificent images showing two large spiral arms sprouting from a north-south oriented bar, one extending northeast and the other southwest, and eventually curving south and north of the bar, respectively.

NGC 7479 lies just south of the Great Square of Pegasus. Chart by Greg Smye-Rumsby.

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