Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)
Getting plate-solving status, please wait...
DWB 111, Propeller Nebula; SHO and HSO; 27 Apr, 25-26 May 2018, David Dearden
Powered byPixInsight

DWB 111, Propeller Nebula; SHO and HSO; 27 Apr, 25-26 May 2018

Getting plate-solving status, please wait...
DWB 111, Propeller Nebula; SHO and HSO; 27 Apr, 25-26 May 2018, David Dearden
Powered byPixInsight

DWB 111, Propeller Nebula; SHO and HSO; 27 Apr, 25-26 May 2018

Equipment

Loading...

Acquisition details

Loading...

Description

I was looking for a narrowband target to work on while the Moon is bright and decided to revisit the Propeller. I’ve processed it both in Hubble Palette (SHO) and in HSO. There’s a lot of nebulosity in Hα, a little in SII, and almost nothing in OIII. Both versions are far better than my last attempt, 3 years ago. I spent quite a lot of time processing these, not quite satisfied, then was away at a mass spectrometry conference, so it’s taken a long time to get these posted.

Date: 27 Apr, 25 & 26 May 2018

Subject: DWB 111, Propeller Nebula

Scope: AT8IN+High Point Scientific Coma Corrector

Filters: ZWO 31 mm diameter unmounted Hα, SII, OIII

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

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

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

Acquisition: Sequence Generator Pro 3.0.2.82

Exposure: 38x300 Hα, 48x300 SII, 42x300 OIII

Stacking: Deep Sky Stacker 4.1.1 (64-bit) dark+flat+bias, κ-σ stacking with κ = 1.5.

Processing: StarTools 1.4.332: Processed each filter stack separately prior to combining. Binned 2x2 in StarTools. Used StarTools’ “Wipe”, then developed, deconvoluted, and denoised. Cleaned up pattern noise, which was particularly bad in the SII data, using Astronomy Tools. Used GradientXTerminator to get rid of some persistent vignetting. Combined the processed filter data using Annie’s Astro Actions, and messed with the channel mixer in Photoshop to tweak the colors to where I wanted. Used a little levels and curves to bring nebulosity out a bit more, and used “Make stars smaller” a couple of times in the HSO version. Used Astronomy Tools’ deep space & space noise reduction, AstroFrame.

Comments

Revisions

  • DWB 111, Propeller Nebula; SHO and HSO; 27 Apr, 25-26 May 2018, David Dearden
    Original
  • Final
    DWB 111, Propeller Nebula; SHO and HSO; 27 Apr, 25-26 May 2018, David Dearden
    B

B

Description: This is the HSO version, which I think I prefer a bit over the SHO.

Uploaded: ...

Sky plot

Sky plot

Histogram

DWB 111, Propeller Nebula; SHO and HSO; 27 Apr, 25-26 May 2018, David Dearden