Planetary nebula M57
Planetary nebula M57 or Ring nebula is in the constellation Lyra (Lyr).
Equatorial coordinates (epoch J2000):
Ra 18h53.6m, Dec +33° 02'
Visual magnitude: 8,8m
Distance from the nebula M57 to the Sun is 2300 light years
Angular size: 86"×62"
External dimensions the nebula M57 are about 0,9 light years.
Age of the object M57 is 10—20x103 years
Discoverer: Charles Messier, 01.1779 year.
The designation M57 in other catalogs: NGC 6720
Optimum magnification for a telescope with observations of M57, depending on the aperture of the telescope (D), is about 50х-2D. Higher magnifications of course add details, but lead to a strong drop in the brightness of the image, making it difficult to observe.
The best month for observing M57 is July.
For observers in the northern latitudes:The nights in July are still quite light, so it makes sense to try to observe M57 also in August.
The first half of August is also not very dark, in addition the object will be at midnight not at its highest point,which provides the least exposure and atmospheric distortion. But, the difference is not so noticeable.And already in the second half of August the night sky becomes quite dark for observations (although in September it will more darker).The farther south the place of your observation is located, the earlier the sky will darken - both in time on the clock and on the calendar.
or tell your friends: