Here is text from Adam Block (link to photo at his site): "This nebula surrounds star 22 Scorpii and is part of the colorful Rho Ophiuchi Complex. At magnitude 4.8 the star can be seen near Antares under a dark sky. However, both this nebula and the other nearby features require long exposures to reveal the true nature of what is in this part of the sky. Some sources indicate this star does not release enough energy to ionize the surrounding gas and make it glow red- and so the nebula is bluish due to the scattered light from dust. However, this deep image hints that there exists some extremely faint ionization (red) near the star. This nebula is around 400 light years away."