M 57
Published by BBC The Sky At Night August 2018
Featured on The Astroimaging Channel 19 August 2018
Published in Astronomy Now Magazine June 2020
M57 is a very small planetary nebula in the constellation Lyra. It is 2,570 light years from Earth.
Picture





TARGET
Nomenclature: M57, Messier 57, Ring Nebula, NGC 6720, GC 4447
Right Ascension: 18:53:35
Declination: +33:01:45
Size: 1.5 arc min, the double outer halo is 5 arc min
Discovery: Charles Messier in late January 1779

EQUIPMENT USED
APM TMB LZOS 152 refractor
10Micron GM2000 HPS mount
QSI6120 CCD camera
Astrodon filters
IMAGE CAPTURE
5nm Ha: 15x1200 bin 1x1, 10x1200 bin 3x3
3nm OIII: 11x1200 bin 1x1, 13x1200 bin 2x2
Red: 10x300 bin 1x1
Green: 8x300 bin 1x1
Blue: 10x300 bin 1x1
Total integration: 18.7 hours
Pixel scale: 0.534 arcsec/pixel
Field radius: 0.248 degrees
Capture dates: 6 June - 25 July 2017
Capture location:  Alcalali, Spain
IMAGE PROCESSING
Pre-processing: CCDStack2
Post-processing: Photoshop CS2