NGC 6853, also known as M 27, is one of the most famous and important PN in the whole night sky.
It's second only to the Helix Nebula for its high integrated-magnitude, and it's visible simply with binoculars. Small telescopes are already useful to highlight the typical "dumbell" shape, and OIII filters give help to see more particulars. This is a complex bipolar-toroid-nebula, with the central large toroid, and the polar lobes in expansion perpendicularly.
Molecular-hydrogen emission analisys show that the progenitor was probably surrounded by a dense circumstellar disk, trown away by the strong star wind. This nebula is surrounded by a faint comet-shaped halo, showing that Dumbell Nebula has a high relative motion, and it's moving through a very dense interstellar dust region.
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