Hemisphere:  Southern  ·  Constellation: Scorpius (Sco)  ·  Contains:  M 4  ·  NGC 6121  ·  The star Al Niyat (σSco)
Getting plate-solving status, please wait...
A Cosmic Duo - SH2-9 & M4 in HaLRGB, 



    
        

            Andy 01
A Cosmic Duo - SH2-9 & M4 in HaLRGB
Powered byPixInsight

A Cosmic Duo - SH2-9 & M4 in HaLRGB

Getting plate-solving status, please wait...
A Cosmic Duo - SH2-9 & M4 in HaLRGB, 



    
        

            Andy 01
A Cosmic Duo - SH2-9 & M4 in HaLRGB
Powered byPixInsight

A Cosmic Duo - SH2-9 & M4 in HaLRGB

Technical card

Imaging telescopes or lenses: Takahashi TOA-130 APO Refractor

Imaging cameras: QSI 6162 monochrome

Mounts: Takahashi NJP Temma-2

Guiding cameras: Starlight Xpress Lodestar Off Axis Guider

Focal reducers: Takahashi 67-FL flattener

Software: Topaz Denoise DeNoise  ·  Adobe Photoshop 2020  ·  Nik Software, Inc. Nik Filters

Filters: Chroma Blue  ·  Chroma Green  ·  Chroma Red  ·  Chroma Luminance  ·  Chroma Ha 2" 5nm

Accessory: Stellarmate Raspberry Pi-4  ·  Takahashi flattener 1.04X Flattener 67  ·  Kendrick Standard Dual Channel Controller


Dates:May 12, 2021

Frames:
Chroma Blue: 30x120" (1h)
Chroma Green: 15x120" (30')
Chroma Ha 2" 5nm: 12x1200" (4h)
Chroma Luminance: 24x300" (2h)
Chroma Red: 15x120" (30')

Integration: 8h

Avg. Moon age: 0.63 days

Avg. Moon phase: 0.45%

Bortle Dark-Sky Scale: 6.00


Basic astrometry details

Astrometry.net job: 4491254

RA center: 16h 21' 59"

DEC center: -26° 3' 0"

Pixel scale: 1.527 arcsec/pixel

Orientation: 86.273 degrees

Field radius: 0.966 degrees


Resolution: 3557x2842

Data source: Backyard

Description

Sh2-9, also called Gum 65 is combination emission and reflection nebula in the Scorpius constellation, surrounding the multiple star system Sigma Scorpii. The nebula is northeast of the globular cluster, Messier 4.

Although it was a tricky challenge to image this under my suburban Bortle 6/7 skies, I'm quite pleased with the outcome. The complimentary colours of cool Al-Niyat and warm M4 seem to balance one another nicely. The big Tak has it's spacing perfect now, so I finally have round stars in all four corners, and the star definition in M4 itself is remarkable.

I've ordered a new TOA-35 reducer to give me a wider FOV, so when that arrives, I'll be able to frame some of these larger objects with a bit more "space" to allow context.

Comments

Revisions

  • A Cosmic Duo - SH2-9 & M4 in HaLRGB, 



    
        

            Andy 01
    Original
  • Final
    A Cosmic Duo - SH2-9 & M4 in HaLRGB, 



    
        

            Andy 01
    C

C

Description: Added 2 hrs LUM data

Uploaded: ...

Sky plot

Sky plot

Histogram

A Cosmic Duo - SH2-9 & M4 in HaLRGB, 



    
        

            Andy 01