Object: Constellation: Coordinates: Size: Brightness:
Messier 57
(= NGC 6720)
Lyr 18h54m / +3302' 1.4' x 1.0' 8.8mag

The planetary nebula Messier 57 ("Ring nebula") in the constellation Lyra on June 30 / July 1, 2014. The gaseous remains of a red giant star are 2300 light-years from Earth and were discovered by Antoine Darquier de Pellepoix in 1779. Messier 57 can be seen in a small telescope (source: Wikipedia).

Twenty-eight 2 minute exposures at ISO 400 with no dark frame subtraction were stacked with Deep Sky Stacker (resulting in a 56 min exposure) and further processed in Photoshop.
Equipment: Canon EOS 450D Baader modified camera, TeleVue Paracorr Type II coma corrector, 16" f/4.5 "Ninja" dobsonian telescope riding on a dual-axis Tom Osypowski equatorial platform, Lacerta MGEN autoguider, Lacerta off axis system (field of view comparison: image of the moon with the same equipment).

Search chart for Messier 57. Map © 2015 "The Mag-7 Star Atlas Project", www.siaris.net. Map is modified. The map can be downloaded here .