M57 envelope in Ha-OIII-OIII (Boris Emchenko)

Celestial hemisphere: Northern · Constellation: Lyra (Lyr) · Contains: IC 1296 · M 57 · NGC 6720 · PK063+13.1 · Ring Nebula

Image of the day 10/14/2020

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M57 envelope in Ha-OIII-OIII

Link: http://astromania.info/gallery/M57_HOO/M57_HOO_3_crop200.jpg

Image of the day 10/14/2020

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M57 envelope in Ha-OIII-OIII

Link: http://astromania.info/gallery/M57_HOO/M57_HOO_3_crop200.jpg

М 57 envelope

M57 halo ("envelope") is considered to be outer layers of the host star blown away by stellar wind during asymptotic giant branch phase just before nebula itself was born.

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The nebula image is Ha-OIII-OIII composition (200% crop of central part). Stars were overlaid from RGB image.

Due to high dynamic range, some processing tweaks were used. First, two separate integrations per filter were made: best of the best based on FWHM criteria for the brightest nebula part and a full set of images for maximizing SNR in shadows. Than stretch of various degree was applied. And they all were combined later into artificial HDR.

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[1] Nebula 3D model image was taken from "Studies of NGC 6720 with Calibrated HST WFC3 Emission-Line Filter Images–I: Structure and Evolution", C. R. O’Dell, G. J. Ferland, W. J. Henney and M. Peimbert, 2013

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Full frame:

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Description: Nebula 3D model [1]

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Description: Full frame

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SW250\|300\|320

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Status	Advanced success
Started	...
Astrometry.net job	3905336
PixInsight job	4L8PVISH1S3X5TOGO2CPY9WXXV6UNRP8
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	18h53m35s.720
RA (top/left)	18h53m06s.908
RA (top/right)	18h54m01s.882
RA (bottom/right)	18h54m03s.240
RA (bottom/left)	18h53m08s.181

Dec (center)	+33°01′40″.49
Dec (top/left)	+32°57′26″.94
Dec (top/right)	+32°57′05″.56
Dec (bottom/right)	+33°05′54″.41
Dec (bottom/left)	+33°06′16″.30

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Image of the day 10/14/2020

M57 envelope in Ha-OIII-OIII

Image of the day 10/14/2020

M57 envelope in Ha-OIII-OIII

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Image of the day 10/14/2020

M57 envelope in Ha-OIII-OIII

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M57 envelope in Ha-OIII-OIII

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