Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Crescent Nebula  ·  HD192003  ·  HD192020  ·  HD192163  ·  HD192182  ·  HD192303  ·  HD192361  ·  HD192444  ·  HD228152  ·  HD228243  ·  HD228304  ·  HD228376  ·  LBN 203  ·  NGC 6888  ·  Sh2-105
Crescent Nebula, KuriousGeorge
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Crescent Nebula

Revision title: RGBHOO

Crescent Nebula, KuriousGeorge
Powered byPixInsight

Crescent Nebula

Revision title: RGBHOO

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Description

Here's the conclusion of my week-long project to gather deep data for the Crescent Nebula in the excellent Julian, CA skies. Here I saw 21.3+ SQM with FWHM on 5-min subs between 1" and 2" for 6 days. 

I particularly focused on OIII to help expose more of the faint nebulosity I've seen in other postings.

RGB was screened over the top for a deep and colorful star field.

"The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5,000 light-years away from Earth. It was discovered by William Herschel in 1792. It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000 to 400,000 years ago. The result of the collision is a shell and two shock waves, one moving outward and one moving inward. The inward moving shock wave heats the stellar wind to X-ray-emitting temperatures".

Comments

Revisions

  • Crescent Nebula, KuriousGeorge
    Original
  • Crescent Nebula, KuriousGeorge
    B
  • Final
    Crescent Nebula, KuriousGeorge
    D

B

Description: Replaced RGB screen with RGB lighten for a slightly softer star field with slightly better color rendition.

Uploaded: ...

D

Title: RGBHOO

Description: Reprocessed without SII for a more traditional look.

Uploaded: ...

Sky plot

Sky plot

Histogram

Crescent Nebula, KuriousGeorge

In these public groups

ASI 6200 MM Pro