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.
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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).
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