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Contains:  M 67, NGC 2682
Getting plate-solving status, please wait...
M67, LRGB, 30-31 Jan 2019, 


            David Dearden
M67, LRGB, 30-31 Jan 2019

M67, LRGB, 30-31 Jan 2019

Technical card

Resolution: 2318x1790

Dates:Jan. 30, 2019Jan. 31, 2019

ZWO Blue 31 mm: 30x120" (gain: 139.00) -20C bin 1x1
ZWO Green 31 mm: 30x120" (gain: 139.00) -20C bin 1x1
ZWO Luminance 31 mm: 25x180" (gain: 139.00) -20C bin 1x1
ZWO Red 31 mm: 27x120" (gain: 139.00) -20C bin 1x1

Integration: 4.2 hours

Avg. Moon age: 25.13 days

Avg. Moon phase: 20.54%

Bortle Dark-Sky Scale: 5.00 job: 2516620

RA center: 132.842 degrees

DEC center: 11.862 degrees

Pixel scale: 1.719 arcsec/pixel

Orientation: 180.605 degrees

Field radius: 0.699 degrees

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

Data source: Backyard


Open clusters are not usually my targets, but I wanted something to image after my primary target had set and this just looked like a good collection of stars. I thought it might have a lot of color, but was interested to see a lot of red and yellow and not much blue. After looking M67 up on Wikipedia, I learned this is relatively old for an open cluster; usually gravitational forces cause them to disperse, but M67 is thought to have been around 3-4 billion years. Hence, there aren’t many short-lived blue stars but there are sun-like yellow dwarves, white dwarves, and red giants. The sun was probably born in a cluster like this. I’ve still got some optical error that makes my stars out-of-round, and did not try to fix that.

Date: 30, 31 Jan 2019
Subject: M67
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 + DSI IIc +PHD 2.6.5dev6 (Win 10 ASCOM)
Camera: ASI1600MM-Cool, -20 °C, Gain 139 Offset 21
Acquisition: Sequence Generator Pro
Exposure: 25x180 L, 27x120 R, 30x120 G, & 30x120 B
Stacking: Deep Sky Stacker 4.1.1 (64-bit) dark+flat (no bias), κ-σ stacking with κ = 1.5.
Processing: StarTools 1.4.332: Did LRGB combination in StarTools with “cap green” on, then software binned 2x2. Vignette wiped. Stretched and HDR optimized. Used the color module and boosted saturation a bit. Deconvoluted and untrack denoised. Used Photoshop to adjust levels, Carboni’s Astronomy Tools to increase star color and decrease star size, followed with “less crunchy more fuzzy.” AstroFrame.



David Dearden
License: None (All rights reserved)

Sky plot

Sky plot


M67, LRGB, 30-31 Jan 2019, 


            David Dearden