M57 (Ring Nebula) ultra-deep (26567089844)
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M57 Large scale structure [Image Of Team] Image credits: Domenico Argentiero, Giuseppe Donatiello, Terenzio Fusco, Federico Lavarino, Colin McGill, Alessandro Elio Milani.
RA: 283,387° Dec: 33,026 The Ring Nebula (Messier 57 or NGC 6720) is a planetary nebula in the northern constellation of Lyra and it is illuminated by a central white dwarf or planetary nebula nucleus (PNN) of 15.75 visual magnitude. All the interior parts of this nebula have a blue-green tinge that is caused by the doubly ionized oxygen emission lines at 495.7 and 500.7 nm. In the outer region of the ring, part of the reddish hue is caused by hydrogen emission at 656.3 nm. M57 is an example of the class of planetary nebulae known as bipolar nebulae. The purpose of this image is only to highlight the large-scale structure of the object, much more extensive than the central part. Note the four lobes only visible in OIII, part of a ring very weak. Clearly visible a halo mostly in OIII in bipolar structure. All images have been aligned with a composition of related RB POSS-II plates.
Telescopes: Ian King Ikharos 8 "RC - SW BKP 250 DS f/4.8 - Celestron C9.25 XLT - (DIY) ED doublet 127 f/9 v.13 - Celestron C8 CPC 800 XLT - A-P EDT 130 f/9
Total exposure: 62 hours.
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