Hemisphere:  Southern  ·  Contains:  NGC 253  ·  Sculptor Filament  ·  Silver Coin

Image of the day 11/19/2020

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    NGC 253 Sculptor Galaxy, 



    
        

            chrislinyy
      NGC 253 Sculptor Galaxy, 



    
        

            chrislinyy

      NGC 253 Sculptor Galaxy

      Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

      Technical card

      Imaging telescopes or lenses: AG Optical 20" iDK

      Mounts: ASA - Astro Systeme Austria DDM85XL

      Software: PixInsight PixInshight Core 1.8 Ripley  ·  Adobe Photoshop CC 2020

      Filters: Luminance  ·  H-alpha  ·  Green  ·  Blue  ·  Red


      Dates:Nov. 5, 2020

      Frames:
      Blue: 9x300" bin 2x2
      Green: 9x300" bin 2x2
      H-alpha: 12x300" bin 2x2
      H-alpha: 6x600" bin 2x2
      Luminance: 15x300" bin 1x1
      Red: 14x300" bin 2x2

      Integration: 5.9 hours

      Avg. Moon age: 19.18 days

      Avg. Moon phase: 79.49%


      Basic astrometry details

      Astrometry.net job: 3997198

      RA center: 0h 47' 33"

      DEC center: -25° 17' 27"

      Pixel scale: 0.549 arcsec/pixel

      Orientation: 269.971 degrees

      Field radius: 0.345 degrees


      Resolution: 3200x3200

      Data source: Amateur hosting facility

      Remote source: Remote Skygems

      Description

      Sub-frames acquired by SkyGems Remote Observatory. Unprocessed integrated FITS are available for download.

      This is a LHaRGB rendition of the starburst galaxy, NGC 253, in the constellation Sculptor. It is pretty dim and only can be viewed with a telescope (actually all objects in the imaging field are too faint to be viewed by naked eye).

      H-alpha data is first black clipped to remove background noise and retain only active regions, then scaled up 4 times and added to the R channel (this way R and Ha are blended with approximately 2:1 ratio). HaRGB channels are all hardware binned to 2x2, then upsampled to align with luminance channel. Heavy denoising and convolution are applied to HaRGB image to smooth out color grains before merging with luminance.

      Color calibration done with AutoColor script in PixInsight, denoised with EZ Denoise script and then stretched. Saturation curves, HDRMultiscaleTransform, LocalHistogramEqualization and UnsharpenMask are applied to bring out more color and sharpness.

      Comments

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      chrislinyy
      chrislinyy
      License: None (All rights reserved)
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      • Final
        NGC 253 Sculptor Galaxy, 



    
        

            chrislinyy
        Original
        NGC 253 Sculptor Galaxy, 



    
        

            chrislinyy
        B

      B

      Description: Annotated

      Sky plot

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      Histogram

      NGC 253 Sculptor Galaxy, 



    
        

            chrislinyy