Suspended high in the summer sky within the graceful parallelogram of Lyra, almost midway along the line connecting magnitude-3.2 Sulafat (Gamma Lyrae) and magnitude-3.5 Sheliak (Beta Lyrae), M57 (NGC 6720)—the famous Ring Nebula—is one of the most celebrated planetary nebulae in the night sky. Glowing near magnitude 8.8, it presents an immediate visual treat even in modest instruments. Sweeping through the region with a small 4-inch refractor at low power reveals a tiny, sharp, blue-green disk that stands out distinctly against a rich field of field stars, looking remarkably like a soft, unblinking cosmic smoke ring floating against the dark background void.
Increasing the magnification to 120 in a medium-aperture telescope coaxes out the nebula's iconic oval geometry and delicate brightness variations. Spanning roughly 80 by 60 arcseconds, the donut-like ring reveals crisp, well-defined outer edges that taper slightly along its major axis, oriented northeast to southwest. Patient observers using delicate averted vision will notice that the central dark opening is not entirely empty; rather, it is filled with a soft, ethereal haze of pale light, giving the center a gauze-like translucency. The thick outer rim exhibits a distinct, subtle mottling, with its eastern and western ends appearing slightly brighter and denser than the narrower northern and southern tips.
In an 8- or 10-inch reflector at 200x or higher under steady, transparent skies, M57 becomes a masterwork of stellar evolution. The rich, ghostly ring displays a vivid turquoise hue, while its delicate, razor-thin outer boundary reveals fine, gossamer fringes extending into space. The elusive 15th-magnitude central white dwarf—the dying engine responsible for illuminating this expanding shell of cast-off gas—presents an exquisite challenge, requiring crisp atmospheric seeing and high magnification to catch its tiny, fleeting pinprick of light momentarily sparkling at the very heart of the glowing oval.