Celestial hemisphere:  Southern  ·  Constellation: Eridanus (Eri)  ·  Contains:  19 Ori)  ·  65 Eri)  ·  67 Eri)  ·  69 Eri)  ·  Algebar (β Ori  ·  Dhalim (β Eri  ·  NGC 1909  ·  Part of the constellation Eridanus (Eri)  ·  The star 63 Eri  ·  The star Cursa  ·  The star Kursi al Jauzah I (ψ Eri  ·  The star Kursi al Jauzah II (λ Eri  ·  The star Rigel  ·  the Witch Head Nebula
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The Witch Head Nebula - IC 2118, RadMan24
The Witch Head Nebula - IC 2118
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The Witch Head Nebula - IC 2118

Getting plate-solving status, please wait...
The Witch Head Nebula - IC 2118, RadMan24
The Witch Head Nebula - IC 2118
Powered byPixInsight

The Witch Head Nebula - IC 2118

Equipment

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Acquisition details

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Description

The Witch Head Nebula with a 36 minute exposure. 

Camera Settings: Canon 90d, Bulb at 58s (37 frames; ~36 minutes total); ISO: 800; Lens Canon 200mm f/2.8 at 2.8 (aperature 71.4mm)

Tracked with Fornax Lightrack ii on a carbon fiber tripod.

Processing:

PS camera raw for color calibartion (daylight color balance; camera standard profile), lens profile, noise and sharpening, reduction in highlights and exposure, creation of 16-bit TIFFs

ImagesPlus for align/stacking. Then took 16-bit TIF file back to PS to add back color space (Adobe 1998) and to align RGB black points.

Rnc-color-stretch performing a color-preserving stretch.

PNG file converted into TIF file in PS, reestablished color profile, and further adjusted with slight curve adjustments, use of HLVG plug-in (removed green cast on top right, but it may have been airglow since red hue remains). ImagesPlus to reduce star size. Then PS for remaining conversion of sRGB from Adobe 1998 and JPG conversion.

Further notes:

Overall image appears a little “too blue”. I may reattempt process in Rawtherapee; or shoot at 300mm next winter with a longer exposure.

Additionally, this was captured in January 13, 2021 – when I was first starting, but simply never got around to it because DSS couldn’t align the image well and couldn't figure out best way to deal with green cast/hue.

Comments

Revisions

  • The Witch Head Nebula - IC 2118, RadMan24
    Original
  • Final
    The Witch Head Nebula - IC 2118, RadMan24
    B

Sky plot

Sky plot

Histogram

The Witch Head Nebula - IC 2118, RadMan24