Celestial hemisphere:  Northern  ·  Constellation: Orion (Ori)  ·  Contains:  IC 2159  ·  Monkey Head Nebula  ·  NGC 2174  ·  NGC 2175  ·  Sh2-252
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NGC 2174/2175, Monkey Head Nebula, (HαR)RGB, 13-16 Nov. 2018, David Dearden
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NGC 2174/2175, Monkey Head Nebula, (HαR)RGB, 13-16 Nov. 2018

Getting plate-solving status, please wait...
NGC 2174/2175, Monkey Head Nebula, (HαR)RGB, 13-16 Nov. 2018, David Dearden
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NGC 2174/2175, Monkey Head Nebula, (HαR)RGB, 13-16 Nov. 2018

Equipment

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Acquisition details

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Description

This image was pieced together over several nights after completing other targets, so it was sort of an attempt to fill in the rest of the night each night. As a result, I had to be a bit selective with subframes because many were shot as dawn approached, but sky conditions were generally pretty clear. I fiddled with the processing to try and retain the RGB star colors while also getting the detail from the Hα luminance. I finally settled on using HαR for luminance and blurred RGB for the color data.

Date: 13-16 Nov 2018

Subject: NGC 2174/2175, Monkey Head Nebula

Scope: AT8IN+High Point Scientific Coma Corrector

Filters: ZWO 31 mm diameter unmounted 7 nm Hα, R, G, B

Mount: EQ-6 (EQMOD 2.000j)+PEC

Guiding: Orion Thin Off-axis Guider + DSI IIc +PHD 2.6.5 (Win 10 ASCOM)

Camera: ASI1600MM-Cool, -20 °C, Gain 139 Offset 21

Acquisition: Sequence Generator Pro 3.0.3.140

Exposure: 55x300 Hα, 23x180 R, 23x180 G, & 18x180 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: Software binned all subs 2x2. Vignette wiped the Hα, color & vignette wiped the RGB, stretched, and HDR optimized. Deconvoluted (3 pixels) and untrack denoised the Hα; processed RGB without deconvolution. Used Photoshop to combine HαR as luminance with RGB (no Hα mixed into the R) using Starizona Method 2. Did a few rounds of levels and curves and saturation adjustments, then AstroFrame.

Comments

Revisions

  • NGC 2174/2175, Monkey Head Nebula, (HαR)RGB, 13-16 Nov. 2018, David Dearden
    Original
  • Final
    NGC 2174/2175, Monkey Head Nebula, (HαR)RGB, 13-16 Nov. 2018, David Dearden
    B

B

Description: Following user ruccdu's suggestion, I applied "cap green to brown" in StarTools (couldn't use HLVG because I do all my processing on a MacBook).

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Sky plot

Sky plot

Histogram

NGC 2174/2175, Monkey Head Nebula, (HαR)RGB, 13-16 Nov. 2018, David Dearden