Cookie consent

AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.

I agree
Contains:  Ring nebula in Lyra, M 57, NGC 6720, IC 1296
Getting plate-solving status, please wait...
M57 - Ring Nebula (2019), 


            Kurt Zeppetello
M57 - Ring Nebula (2019)

M57 - Ring Nebula (2019)

Technical card

Resolution: 1577x1144

Dates:June 21, 2019June 22, 2019June 23, 2019

ZWO B 1.25" optimized for ASI1600: 32x90" (gain: 139.00) -10C bin 1x1
ZWO G 1.25" optimized for ASI1600: 28x90" (gain: 139.00) -10C bin 1x1
ZWO L 1.25" optimized for ASI1600: 38x90" (gain: 139.00) -10C bin 1x1
ZWO R 1.25" optimized for ASI1600: 39x90" (gain: 139.00) -10C bin 1x1

Integration: 3.4 hours

Darks: ~12

Flats: ~15

Bias: ~20

Avg. Moon age: 19.55 days

Avg. Moon phase: 75.93%

Bortle Dark-Sky Scale: 5.00

Temperature: 18.00 job: 2772936

RA center: 18h 53' 35"

DEC center: +33° 1' 40"

Pixel scale: 1.206 arcsec/pixel

Orientation: 172.251 degrees

Field radius: 0.326

Locations: Happy Frog Observatory, Monroe, Connecticut, United States

Data source: Backyard


The Ring Nebula (M57) is a planetary nebula formed when a sun-like star ejected the outer layers of ionized gas. This nebula is approximately 2000 light-years away in the constellation Lyra. Like all planetary nebula, M57 is also a type of emission nebula. In this image blue color in the center portion represents helium, the light blue color of the inner ring is hydrogen and oxygen, and the reddish and magenta color of the outer ring is from nitrogen and sulfur. Also, the blue dot in the center of the nebula is the core of the star - now a white dwarf.

The last time I imaged this was three years ago and have waited until I felt I could do better. The nebula and star field are much superior in this image than in my previous image due in part to better equipment and improved processing skills.

This was the first image since getting the electronic automatic focuser, ZWO EAF, and I love it. I have been able focus with this better and quicker than I ever was able to by hand. It was easy to install and works with APT really well. Although there is an automatic focus aid with APT, I find I get better focus with the Bahtinov mask. I will have to update my equipment profile soon as I have added a few behind the scenes tools.

Processing this was a bit tricky as the Ring seemed overexposed so I had to tone it down in Photoshop in order bring out the fine detail. I normally don't crop my images this much but the Ring is very small and also I wanted to highlight the small barred spiral galaxy IC 1296 just left of M57. I did not even know about this until I processed the image but it turned out to be a nice surprise.



Kurt Zeppetello
License: None (All rights reserved)

Sky plot

Sky plot


M57 - Ring Nebula (2019), 


            Kurt Zeppetello