Hemisphere:  Northern  ·  Constellation: Leo Minor (LMi)  ·  Contains:  NGC 3344  ·  NGC3344
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NGC 3344, LRGB, 13 Apr 2020, 


            David Dearden
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NGC 3344, LRGB, 13 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 13, 2020April 14, 2020

ZWO Blue 31 mm: 20x180" (gain: 139.00) -20C bin 1x1
ZWO Green 31 mm: 10x180" (gain: 139.00) -20C bin 1x1
ZWO Luminance 31 mm: 60x180" (gain: 139.00) -20C bin 1x1
ZWO Red 31 mm: 20x180" (gain: 139.00) -20C bin 1x1

Integration: 5.5 hours

Avg. Moon age: 21.21 days

Avg. Moon phase: 59.90%

Bortle Dark-Sky Scale: 5.00

Astrometry.net job: 3414858

RA center: 10h 43' 35"

DEC center: +24° 54' 51"

Pixel scale: 1.718 arcsec/pixel

Orientation: 4.713 degrees

Field radius: 0.699 degrees

Resolution: 2318x1790

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

Data source: Backyard


22.5 MLy

My last attempt on this galaxy was 4 years ago and last night started out beautifully clear, so with the Moon departing I decided to give this target a try. Things started out well, but to my surprise when I got up this beautifully clear morning to look at the results I found that clouds entered the picture a bit before this acquisition was supposed to finish (and I therefore didn’t get anything on the 2 subsequent targets I had planned on). Hence, I only got 10 G subs, but couldn’t resist going ahead and processing what I have. This one was fairly straightforward except that I didn’t have enough G subs for the κ-σ stacking I usually use; I went with median instead for that. I also fooled around a bit with the color trying to match the color histograms. I love the tight inner ring and the faint outer arm (ring) of this galaxy and was also delighted to see, on closer inspection, that there are more small “faint fuzzies” in the background than I had expected. For example, there’s a pretty s-shaped barred spiral at about 5 o'clock 1/3 of the way from the bottom to the center.

Date: 13-14 Apr 2020
Subject: NGC 3344
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: 20x180 R, 60x180 L, 20x180 B, 10x180 G
Stacking: Deep Sky Stacker 4.2.3 (64-bit) dark+flat+bias, κ-σ stacking with κ = 1.5 except median stacking for G.
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, accounting for the decreased integration of G. Software binned 2x2, cropped, developed, HDR (optimize soft), color with a lot of saturation boost, untrack denoised (grain removal). Applied L to color in Photoshop. A little bit of levels+curves adjustment, increase star color, two rounds of layer-masked deep space noise reduction followed by layer-masked “less crunchy more fuzzy.” AstroFrame.


Sky plot

Sky plot


NGC 3344, LRGB, 13 Apr 2020, 


            David Dearden