Hemisphere:  Northern  ·  Contains:  VdB142
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IC 1396, Elephant Trunk Nebula, SHO Hubble Palette with RGB Stars, Aug 2019, 



    
        

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

Imaging telescopes or lenses: Astro-Tech AT8IN

Imaging cameras: ZWO ASI1600MM-Cool

Mounts: Skywatcher NEQ-6 Pro Synscan

Guiding telescopes or lenses: Astro-Tech AT8IN

Guiding cameras: ZWO AS120MM-Mini

Focal reducers: High Point Scientific Coma Corrector Photo & Visual For Netwonian Telescopes 2"

Software: DeepSkyStacker  ·  Silicon Fields StarTools 1.3  ·  AstroPlanner  ·  PHD2 Guiding  ·  Sequence Generator Pro  ·  EQASCOM  ·  photoshop  ·  Enterprise Astronomy Annie's Astro Actions

Filters: ZWO SII 7nm  ·  ZWO Red 31 mm  ·  ZWO OIII 31 mm 7 nm  ·  ZWO Green 31 mm  ·  ZWO H-alpha 7nm  ·  ZWO Blue 31 mm

Accessory: Orion Thin Off Axis Guider (TOAG)  ·  Robert Brown's Arduino ASCOM Focuser Pro DIY  ·  ZWO EFW filter wheel


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: 21h 34' 38"

DEC center: +57° 41' 31"

Pixel scale: 1.718 arcsec/pixel

Orientation: -177.716 degrees

Field radius: 0.699 degrees


Resolution: 2318x1790

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



    
        

            David Dearden