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Eskimo Nebula


15 Minute Subs Version

 

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The Eskimo Nebula with different exposures. Click image for full size version.

 


Common Name Eskimo Nebula
Formal Name NGC 2392, Caldwell 39
Date 3/29/2017
Constellation Gemini
Location BrewSky Observatory, Casa Grande, AZ
Equipment Celestron Edge/11, SBig STF8300M, St-i Guider, Astrodon filters
Temperature −10°C
Exposures
# Exp (sec) Filter Bin Net Time (hr)
15 900 Blue 2x2 3.75
18 900 Red 2x2 1.17
10 900 Green 1x1 2.5
10 900 OIII 1x1 2.5
Total 13.25 hrs
Processing Collected/Calibrated in Maxim using ACP

Processed in PixInsight

Aligned on a 1x1 Green sub, so the 2x2 frames were resampled to 1x1 size.

Synthetic Luminance:

  • Created from integrating R,G,B,OIII masters.
  • Combined 50-50 with OIII.
  • Deconvolution, minor stretching applied.

RGB:

  • Deconvolution run against each R,G,B,OIII master.
  • Green channel is 50-50 combination of Green and OIII masters.
  • Blue channel is 25-75 combination of Blue and OIII masters.
  • Combined R, GreenMix, BlueMix channels for RGB.
  • DBE, Photometric color Calibrated
  • Very minor stretch, HDRMultiscale/LHE for contrast, Curves
  • Combined with Synthetic Luminance, several curves applied.
Notes The Eskimo Nebula (NGC 2392), also known as the Clownface Nebula or Caldwell 39, is a bipolar double-shell planetary nebula (PN). It was discovered by astronomer William Herschel in 1787. The formation resembles a persons head surrounded by a parka hood. It is surrounded by gas that composed the outer layers of a Sun-like star. The visible inner filaments are ejected by a strong wind of particles from the central star. The outer disk contains unusual, light-year-long filaments.

NGC 2392 lies more than 2,870 light-years away.
- Wikipedia

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30 Second Subs Version

Common Name Eskimo Nebula
Formal Name NGC 2392, Caldwell 39
Date 3/29/2017
Constellation Gemini
Location BrewSky Observatory, Casa Grande, AZ
Equipment Celestron Edge/11, SBig STF8300M, St-i Guider, Astrodon filters
Temperature −10°C
Exposures
# Exp (sec) Filter Bin Net Time (hr)
22 30 Blue 2x2
25 30 Red 2x2
27 30 Green 2x2
27 30 HAlpha 2x2
Total 1 hr
Processing These frames were collected because the 15 minute exposures initially appeared to be overexposed and unusable. Collected/Calibrated in Maxim using ACP.

Processed in PixInsight

Synthetic Luminance:

  • Created from integrating R,G,B,OIII, and HAlpha masters.
  • Deconvolution, minor stretching applied.

RGB:

  • Created from R,G,B masters.
  • DBE, Background Neutralized, Photometric color Calibrated
  • Deconvoluted, very minor stretch, HDRMultiscale/LHE for contrast
  • Sharpened, curves.
  • Combined with Synthetic Luminance, several curves applied.
Notes