The planetary nebula Messier 57 ("Ring nebula") in the constellation of Lyra on October 2, 2011. 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.

Six 4 minute exposures at ISO 1600 were added for this shot with the DeepSkyStacker software and the final image processing was done in Photoshop. My first attempt with 8 minute exposures failed since the nebula already showed blown highlights.
Equipment: Canon EOS 20Da camera, TeleVue coma corrector, Zambuto 16" f/5 quartz optics in a Dieter Martini dobsonian telescope, dual-axis Tom Osypowski equatorial platform, Lacerta MGEN autoguider, Teleskop-Service off axis system TS-OAG9 EOS.