Hemisphere:  Northern  ·  Constellation: Lyra (Lyr)  ·  Contains:  IC 1296  ·  M 57  ·  NGC 6720  ·  Ring Nebula

Image of the day 10/14/2020

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    M57 envelope in Ha-OIII-OIII, 



    
        

            Boris Emchenko
    M57 envelope in Ha-OIII-OIII
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    Technical card

    Imaging telescopes or lenses: Customized Newton320/4.5

    Imaging cameras: Atik 383L+ Mono

    Mounts: WS-180

    Guiding telescopes or lenses: Customized Newton320/4.5

    Focal reducers: ASA 3" Wynne Corrector 0.95x

    Software: Pleiades Astrophoto PixInshight  ·  CCDCommander  ·  FitStacker

    Filters: Baader Planetarium LRGB 36 mm, Ha (7 nm), OIII (8,5 nm), SII (8 nm)


    Dates:April 13, 2020May 24, 2020June 28, 2020July 2, 2020July 14, 2020

    Frames:
    Baader B 36mm: 80x120" bin 1x1
    Baader G 36mm: 51x120" bin 1x1
    Baader Ha 36mm 7nm: 85x1200" bin 1x1
    Baader OIII 8.5nm 36mm: 48x1200" bin 1x1
    Baader R 36mm: 50x120" bin 1x1

    Integration: 50.4 hours

    Avg. Moon age: 13.07 days

    Avg. Moon phase: 49.35%


    Basic astrometry details

    Astrometry.net job: 3905336

    RA center: 18h 53' 35"

    DEC center: +33° 1' 40"

    Pixel scale: 0.407 arcsec/pixel

    Orientation: 178.235 degrees

    Field radius: 0.121 degrees


    Resolution: 1700x1300

    Locations: Astromania Vedrus remote observatory, Krasnodar, Russian Federation

    Data source: Amateur hosting facility

    Remote source: Astro Hostel Krasnodar

    Description

    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:

    Comments

    Revisions

    • Final
      M57 envelope in Ha-OIII-OIII, 



    
        

            Boris Emchenko
      Original
      M57 envelope in Ha-OIII-OIII, 



    
        

            Boris Emchenko
      B
      M57 envelope in Ha-OIII-OIII, 



    
        

            Boris Emchenko
      C

    B

    Description: Nebula 3D model [1]

    Uploaded: ...

    C

    Description: Full frame

    Uploaded: ...

    Sky plot

    Sky plot

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    M57 envelope in Ha-OIII-OIII, 



    
        

            Boris Emchenko