M27 NGC 6853 Dumbell Nebula Halpha 7nm: over 10 hrs (Ha 42x900s) calibrated and stacked and processed in Pixinsight and CS5.
|Center (RA, Dec):||(299.903, 22.721)|
|Center (RA, hms):||19h 59m 36.619s|
|Center (Dec, dms):||+22° 43' 16.839"|
|Size:||28.8 x 23 arcmin|
|Pixel scale:||0.946 arcsec/pixel|
|Orientation:||Up is -179 degrees E of N|
M27 NGC 6853 Dumbell Nebula
|Apparent Dimension||8' x 5,6'|
M27 NGC 6853 Dumbell Nebula is one of the most famous and important planetary nebulae around the sky. Its high full magnitude places it second among the brightest planets in the sky just after the Helix Nebula. It is already visible with small binoculars as a milky stain; are needed telescopes also of reduced diameter in order to highlight the characteristic shape of a dumbbell or a bell. It lends itself very well to the use of the OIII filter with which it is possible to distinguish the dark central area clear.
At a structural level it is a complex toroidal bipolar planetary nebula where the brightest inner zone represents the toroid widespread and off; perpendicularly are distributed polar lobes expanding. Even the molecular hydrogen emission analyzes suggest that the ancestor was originally surrounded by a dense circumstellar disk and then this was swept away by the violent stellar wind.
The planetary is surrounded on the outside by a faint halo has the shape of a comet that indicates how the nebula has a high relative motion and that its movement takes place in a region with a higher density of interstellar dust.(source Diego Barucco - PNebulae)
The Global Kinematics of the Dumbbell Planetary Nebula (NGC 6853, M27, PN G060.8-03.6) - Meaburn, J.; Boumis, P.; Christopoulou, P. E.; Goudis, C. D.; Bryce, M.; López, J. A.- Revista Mexicana de Astronomía y Astrofísica Vol. 41, pp. 109-119 (2005)