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M100 and Vicinity, LRGB, 2-4 May 2019, 


            David Dearden
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M100 and Vicinity, LRGB, 2-4 May 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  ·  Noel Carboni's Astro Tools for PhotoShop  ·  AstroPlanner  ·  PHD2 Guiding  ·  Sequence Generator Pro  ·  Nebulosity  ·  EQASCOM  ·  photoshop

Filters: ZWO Red 31 mm  ·  ZWO Luminance 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:May 2, 2019May 3, 2019May 4, 2019

ZWO Blue 31 mm: 20x180" (gain: 139.00) -20C bin 1x1
ZWO Green 31 mm: 20x180" (gain: 139.00) -20C bin 1x1
ZWO Luminance 31 mm: 68x180" (gain: 139.00) -20C bin 1x1
ZWO Red 31 mm: 20x180" (gain: 139.00) -20C bin 1x1

Integration: 6.4 hours

Avg. Moon age: 28.12 days

Avg. Moon phase: 2.90%

Bortle Dark-Sky Scale: 5.00

Astrometry.net job: 2681579

RA center: 12h 23' 50"

DEC center: +15° 41' 52"

Pixel scale: 1.721 arcsec/pixel

Orientation: 2.805 degrees

Field radius: 0.706 degrees

Resolution: 2343x1800

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

Data source: Backyard


66±6 MLy

I’m finally getting full automated sessions without crashes again, so it looks like my recent adaptation to the new guide camera is nearing completion. The declination backlash in my mount is now becoming a vexing problem. I’ve ignored it until now but with the current setup it is becoming obvious and annoying, so I guess I’ll be working on that next. M100 is a pretty spiral and there are a lot of other faint fuzzies in the neighborhood, and this has often attracted me to this region of sky. I may have pushed the saturation a little too far in this image, but I’ve always liked to see color…

Date: 2-4 May 2019
Subject: M100 and Environs
Scope: AT8IN+High Point Scientific Coma Corrector
Filters: ZWO 31 mm diameter unmounted 7 nm L, R, G, B
Mount: EQ-6 (EQMOD 2.000j)+PEC
Guiding: Orion Thin Off-axis Guider + ASI120MM-mini +PHD 2.6.5dev6 (Win 10 ASCOM)
Camera: ASI1600MM-Cool, -20 °C, Gain 139 Offset 21
Acquisition: Sequence Generator Pro
Exposure: 70x180 L, 20x180 R, 20x180 G, 20x180 B
Stacking: Deep Sky Stacker 4.1.1 (64-bit) dark+flat+bias, κ-σ stacking with κ = 1.5.
Processing: StarTools 1.4.341: Cropped, wiped, developed, HDR optimized, deconvoluted, and untrack denoised the L data. Combined RGB in StarTools, then cropped, wiped, developed, and used the color module on the RGB data, increasing the saturation. Untrack denoised. Combined L with RGB, performed deep space noise reduction, made a slight levels adjustment to darken, used 1 round of layer masked “Make stars smaller.” AstroFrame.



David Dearden
License: None (All rights reserved)

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M100 and Vicinity, LRGB, 2-4 May 2019, 


            David Dearden