Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  NGC 3179  ·  NGC 3181  ·  NGC 3184  ·  NGC3179  ·  NGC3184
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NGC 3184, LRGB, 10 Apr 2020, 


            David Dearden
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NGC 3184, LRGB, 10 Apr 2020

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: photoshop  ·  DeepSkyStacker  ·  Noel Carboni's Astro Tools for PhotoShop  ·  StarTools  ·  AstroPlanner  ·  PHD2 Guiding  ·  Sequence Generator Pro  ·  EQASCOM

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:April 10, 2020April 11, 2020

ZWO Blue 31 mm: 15x180" (gain: 139.00) -20C bin 1x1
ZWO Green 31 mm: 15x180" (gain: 139.00) -20C bin 1x1
ZWO Luminance 31 mm: 45x180" (gain: 139.00) -20C bin 1x1
ZWO Red 31 mm: 15x180" (gain: 139.00) -20C bin 1x1

Integration: 4.5 hours

Avg. Moon age: 18.07 days

Avg. Moon phase: 87.88%

Bortle Dark-Sky Scale: 5.00

Astrometry.net job: 3404537

RA center: 10h 18' 18"

DEC center: +41° 25' 13"

Pixel scale: 1.719 arcsec/pixel

Orientation: 6.971 degrees

Field radius: 0.649 degrees

Resolution: 2167x1640

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

Data source: Backyard


39.8 ± 12 MLy

The sky was too clear, and I’m too stir crazy with working from home, to pass up a chance to image even though there is still a lot of Moon. My last attempt on this target was way back in 2016 so I thought I’d try it again. Finally having all my camera cabling and focuser tension issues worked out, it is really nice to have imaging sessions “just work.” I tried to start as soon as it got dark so as to maximize imaging time before the Moon rose. I could have taken a little more data but also wanted to move on to a second target. It was also really nice to have good flats. This image is quite a lot better than my last attempt.

Date: 10-11 Apr 2020
Subject: NGC 3184
Scope: AT8IN+High Point Scientific Coma Corrector
Filters: ZWO 31 mm diameter unmounted L, R, G, B
Mount: EQ-6 (EQMOD 2.000j)+PEC
Guiding: Orion Thin Off-axis Guider + ASI120MM-mini +PHD 2.6.7 (Win 10 ASCOM)
Camera: ASI1600MM-Cool, -20 °C, Gain 139 Offset 21
Acquisition: Sequence Generator Pro
Exposure: 15x180 R, 15x180 G, 45x180 L, 15x180 B
Stacking: Deep Sky Stacker 4.2.3 (64-bit) dark+flat+bias, κ-σ stacking with κ = 1.5 (see above!).
Processing: StarTools 1.6.392 beta: Software binned L 2x2, cropped, wiped, developed, HDR (reveal all), deconvoluted, untrack denoised (grain equalization). Combined R, G, & B in StarTools. Software binned 2x2, cropped, wiped, developed, HDR (optimize hard), color with a lot of saturation boost, untrack denoised (grain removal). Applied L to color in Photoshop. A little bit of levels adjustment, and one round of deep space noise reduction. AstroFrame.


Sky plot

Sky plot


NGC 3184, LRGB, 10 Apr 2020, 


            David Dearden