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I agreeImaging 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:AstroPlanner , Silicon Fields StarTools 1.3 , PHD2 Guiding , Sequence Generator Pro , EQASCOM , DeepSkyStacker , photoshop , Enterprise Astronomy Annie's Astro Actions
Filters:ZWO OIII 31 mm 7 nm , ZWO H-alpha 7nm , ZWO SII 7nm , ZWO Red 31 mm , ZWO Green 31 mm , 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, 2019 , Aug. 23, 2019 , Aug. 24, 2019 , Aug. 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
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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