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

Getting plate-solving status, please wait...
    M57 envelope in Ha-OIII-OIII, 



    
        

            Boris Emchenko
    Powered byPixInsight

    Image of the day 10/14/2020

    Getting plate-solving status, please wait...
      M57 envelope in Ha-OIII-OIII, 



    
        

            Boris Emchenko
      Powered byPixInsight

      Acquisition details

      Dates:
      April 13, 2020 ·  May 24, 2020 ·  June 28, 2020 ·  July 2, 2020 ·  July 14, 2020
      Frames:
      Baader Blue (B-CCD) 36 mm: 80×120(2h 40′) bin 1×1
      Baader Green (G-CCD) 36 mm: 51×120(1h 42′) bin 1×1
      Baader H-alpha 7nm 36 mm: 85×1200(28h 20′) bin 1×1
      Baader O-III 8.5nm 36 mm: 48×1200(16h) bin 1×1
      Baader Red (R-CCD) 36 mm: 50×120(1h 40′) bin 1×1
      Integration:
      50h 22′
      Avg. Moon age:
      13.07 days
      Avg. Moon phase:
      49.35%

      RA center: 18h53m35s.720

      DEC center: +33°0140.49

      Pixel scale: 0.407 arcsec/pixel

      Orientation: -178.216 degrees

      Field radius: 0.121 degrees

      WCS transformation: thin plate spline

      More info:Open 

      Resolution: 1700x1300

      File size: 647.9 KB

      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

      Histogram

      M57 envelope in Ha-OIII-OIII, 



    
        

            Boris Emchenko