M57

M57 = NGC6720 ( 18h 53.6m +33°03´, 9.0 mag. )
Ring Nebula in Lyra was discovered by Antoine Darquier de Pellepoix in 1779 and Messier observed it on January 31, 1779. This annular planetary nebula is approx. 1,100 ly distant and 0.4 ly across.

M57 Ring Nebula
A small but bright northern constellation lying between DECL=+30 and DECL=+40 and RA=18h and RA=19h.

M57 is illuminated by a central white dwarf of 14.7 visual magnitude. This star was discovered in 1800 by Count Friedrich von Hahn.
M57 is best seen through at least an 8-inch telescope, but even a 3-inch telescope will show the ring.

M57 is the most famous of all planetary nebulae. This Hubble image is the sharpest ever taken of it. In the image, the orbiting telescope is looking through a tunnel of gas that has been cast off by a dying star thousands of years ago.

M57 (NGC 6720) known as the Ring Nebula, is the finest planetary nebula in the skies. The ring itself should be clearly visible in medium scopes, while the fourteen magnitude central star may take a little longer.

The Ring Nebula (M57), a planetary nebula in the constellation Lyra During the red giant phase, a star often loses a lot of its outer layers which are blown away by the radiation coming from below.

M57 (NGC 6720, Ring Nebula)
M63 (NGC 5055, Sunflower Galaxy)
M64 (NGC 4826, Black Eye Galaxy)
M74 (NGC 628, spiral galaxy)
M76 (NGC 650, Little Dumbbell Nebula)
M80 (NGC 6093, globular cluster)
M81 (NGC 3031, spiral galaxy) ...

M57, the Ring Nebula, is probably the finest example of a planetary nebula anywhere in the sky. It was formed when a star about the size of the Sun neared the end of its life cycle and shed its outer shell of hydrogen gas.

On the other hand, there are certain Messier objects whose magnitude is low, but because they are tiny, they have a high surface brightness - a good example is the Ring Nebula, M57 in Lyra. This magnitude 9 planetary nebula is just 1.3 x 1.

Also known as M57 or NGC 6720, it is straight above the Dumbell, 41 degrees above the horizon. It is bright enough to find easily. About 40 percent as bright as the Dumbell Nebula, it is fairly bright, but it appears very small.

M56 (globular cluster)
M57 The Ring Nebula (planetary nebula)
The Lyre (a stringed instrument like a harp) was invented by Hermes as a gift to his half-brother Apollo, who gave it to Orpheus, the musician of the Argonauts.

planetary nebula in the northern constellation Lyra; cataloged as M57 or NGC 6720. It is perhaps the most famous and beautiful nebula of this type. Its name describes the appearance of the expanding shell of gas.

A famous planetary nebula (M57, NGC 6720) in the constellation Lyra. [C95]
Rise Time
The time required for the vehicle to achieve its optimum height (in rocket or balloon astronomy). [H76]
Ritchey-Chrétien ...

These include: identify Polaris, identify six ancient constellations, state the phase of the Moon, identify any visible planets, use a telescope to find M57, etc.

The famously named "Ring Nebula" is located in the northern constellation of Lyra, and also catalogued as Messier 57, M57 or NGC 6720....
Rosette Nebula
Rosette Nebula ...

A planetary nebula is created when the star puffs off its outer atmosphere. The nebula usually looks like a doughnut, sometimes with the small, hot, rapidly evolving star visible in the center. The Ring Nebula (M57) in the constellation Lyra is an ...

The Ring Nebula M57 and the Carina Nebula (NGC 3372) are located in the Sagittarius Arm. The next arm inside of the Sagittarius Arm is called the Crux Arm. The inner arms are much shorter, obviously from being shifted by gravitational forces.

The gas ejected will form a thin shell around the star. It is a planetary nebula. Here is the Ring nebula, M57, easily visible through a small telescope. Some others were taken by the Hubble Space Telescope.

Topic: Astronomy