Contains:  M 16, Eagle nebula, NGC 6611
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M16, Eagle/Star Queen Nebula, HαRRGB Using Starizona Methods, June 2018, 





    
        

            David Dearden
M16, Eagle/Star Queen Nebula, HαRRGB Using Starizona Methods, June 2018

M16, Eagle/Star Queen Nebula, HαRRGB Using Starizona Methods, June 2018

Technical card

Resolution: 2310x1779

Integration: 0.0 hours

Astrometry.net job: 2130482

RA center: 274.690 degrees

DEC center: -13.809 degrees

Pixel scale: 1.719 arcsec/pixel

Orientation: 90.424 degrees

Field radius: 0.696 degrees

Locations: Mapleton Lateral Observatory, Mapleton, Utah, United States

Data source: Backyard

Description

I don’t usually repost the same data under a new heading, but after seeing how the Starizona HαRRGB methods worked on M17 I had to go back and try them on M16. These data look (in my opinion) dramatically better when processed using the Starizona methods so I’m going to break my own rule. I used my RGB image posted previously (https://astrob.in/352634/B/), added Hα to the R, and used either Hα+R (method 1) or Hα alone (method 2) for luminance. I tweaked the curves as suggested on the Starizona site, boosted the saturation a little, and used Carboni’s layer-masked “less crunchy more fuzzy” to make the stars less harsh. I think these look a lot better than what I posted earlier. This time I think I prefer the method 2 image for the detail it reveals in the nebulosity.

Date: 15-20 Jun 2018
Subject: M16, Eagle or Star Queen Nebula
Scope: AT8IN+High Point Scientific Coma Corrector
Filters: ZWO 31 mm diameter unmounted L, R, G, B, Hα
Mount: EQ-6 (EQMOD 2.000j)+PEC
Guiding: Orion Thin Off-axis Guider + DSI IIc +PHD 2.6.5 (Win 10 ASCOM)
Camera: ASI1600MM-Cool, -20 °C, Gain 139 Offset 21
Acquisition: Sequence Generator Pro 3.0.2.91
Exposure: 51x180 L, 20x180 R, 20x180 G, 20x180 B, 48x300 Hα
Stacking: Deep Sky Stacker 4.1.1 (64-bit) dark+flat+bias, κ-σ stacking with κ = 1.5.
Processing: StarTools 1.4.332: Combined R, G, and B in StarTools. Binned 2x2, cropped, wiped, developed, HDR, color, deconvolution. Stopped tracking to smooth. Binned L 2x2, cropped, no wipe, and developed followed by HDR. Deconvolution followed by untrack smoothing. Combined L with RGB in Photoshop. Used some layer-masked saturation adjustments, both in the master and in the red channel, to try and retain the red color. A little of Carboni’s Astronomy Tools’ increase star color followed by less crunchy more fuzzy. Green cast in stars removed using StarTools’ “Cap Green to Yellow”. Also some different choices in Curves for the luminance and RGB layers to better bring out the reds in the emission nebula. Added Hα as described above.

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Author

dvdearden
David Dearden
License: None (All rights reserved)
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Revisions

  • M16, Eagle/Star Queen Nebula, HαRRGB Using Starizona Methods, June 2018, 





    
        

            David Dearden
    Original
  • Final
    M16, Eagle/Star Queen Nebula, HαRRGB Using Starizona Methods, June 2018, 





    
        

            David Dearden
    B

B

Method 2

Sky plot

Sky plot

Histogram

M16, Eagle/Star Queen Nebula, HαRRGB Using Starizona Methods, June 2018, 





    
        

            David Dearden