Sigma (σ) Scorpii (magnitudes 2.9 and 8.4, 19.8″ separation, P.A. 271°): With similar magnitudes but twice the separation of Delta Herculis, Sigma Scorpii is a relatively easy small-scope target.

Sigma Scorpii, a quadruple system, is 300 light-years behind the complex, while M4 is some 6,500 light-years beyond it! Large binoculars under very dark skies may be most revealing.

The bright red area in the bottom right is light from the star in the center -- Sigma Scorpii -- that is reflected off of the dust surrounding it, creating what is called a reflection nebula.

Sigma Scorpii.—Popular Astronomy for November contains a note by Mr. B. H. Dawson on an occulta-tion of this star that he observed at La Plata on July 25. The disappearance was in two sharp ...

Globular cluster M4 and Sigma Scorpii can also be seen in the image. "It is such a beautiful part of the night sky, with bright colors from various types of nebulae shining in front of a myriad of ...

The bright red area in the bottom right is light from the star in the center – Sigma Scorpii – that is reflected off of the dust surrounding it, creating what is called a reflection nebula.