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IC 1396, Elephant Trunk Nebula, SHO Hubble Palette with RGB Stars, Aug 2019, 





    
        

            David Dearden
IC 1396, Elephant Trunk Nebula, SHO Hubble Palette with RGB Stars, Aug 2019

IC 1396, Elephant Trunk Nebula, SHO Hubble Palette with RGB Stars, Aug 2019

Technical card

Resolution: 2318x1790

Dates:Aug. 22, 2019Aug. 23, 2019Aug. 24, 2019Aug. 25, 2019

Frames:
ZWO Blue 31 mm: 23x180" (gain: 139.00) -20C bin 1x1
ZWO Green 31 mm: 20x180" (gain: 139.00) -20C bin 1x1
ZWO H-alpha 7nm: 34x300" (gain: 139.00) -20C bin 1x1
ZWO OIII 31 mm 7 nm: 20x300" (gain: 139.00) -20C bin 1x1
ZWO Red 31 mm: 20x180" (gain: 139.00) -20C bin 1x1
ZWO SII 7nm: 24x300" (gain: 139.00) -20C bin 1x1

Integration: 9.7 hours

Avg. Moon age: 22.53 days

Avg. Moon phase: 46.06%

Bortle Dark-Sky Scale: 5.00

Astrometry.net job: 2907875

RA center: 323.659 degrees

DEC center: 57.692 degrees

Pixel scale: 1.718 arcsec/pixel

Orientation: 177.521 degrees

Field radius: 0.699 degrees

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

Data source: Backyard

Description

I thought I’d try a more magnified view of the Elephant Trunk in SHO using the AT8IN; my last previous attempt was a wider-field shot using the less-than-flat field of the Orion ST-80. I tried some different approaches to blending in the RGB stars. This is the result.

Date: 22, 23, 25 Aug 2019
Subject: IC 1396, Elephant Trunk Nebula
Scope: AT8IN+High Point Scientific Coma Corrector
Filters: ZWO 31 mm diameter unmounted 7 nm Hα, OIII, SII
Mount: EQ-6 (EQMOD 2.000j)+PEC
Guiding: Orion Thin Off-axis Guider + ASI120MM-mini +PHD 2.6.6 (Win 10 ASCOM)
Camera: ASI1600MM-Cool, -20 °C, Gain 139 Offset 21
Acquisition: Sequence Generator Pro 3.0.3.198
Exposure: 34x300 Hα, 20x300 OIII, 24x300 SII, 20x180 R, 20x180 G, 23x300 B
Stacking: Deep Sky Stacker 4.2.2 (64-bit) dark+flat+bias, κ-σ stacking with κ = 1.5.
Processing: StarTools 1.4.352: Software binned 2x2, cropped, wiped, developed, HDR optimized, deconvoluted, and untrack denoised the Hα, OIII, and SII data separately. Combined using Annie’s Astro Actions Hubble Palette process. Combined R, G, and B in StarTools, 2x2 software binned, cropped, wiped, developed, HDR optimized, deconvoluted, and untrack denoised. Healed the stars out of the SHO and made a stars-only image from the RGB (which was a little imperfect in that a little of the nebula remained). Combined the starless SHO with the RGB stars in Photoshop using “Lighten”. Boosted saturation. AstroFrame.

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Author

dvdearden
David Dearden
License: None (All rights reserved)
850
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IC 1396, Elephant Trunk Nebula, SHO Hubble Palette with RGB Stars, Aug 2019, 





    
        

            David Dearden