Hemisphere:  Southern  ·  Constellation: Orion (Ori)  ·  Contains:  12.62  ·  132 Aethra  ·  27 p Ori  ·  28 eta Ori  ·  31 Ori  ·  34 del Ori  ·  36 ups Ori  ·  41 the01 Ori  ·  42 c Ori  ·  43 the02 Ori  ·  44 iot Ori  ·  45 Ori  ·  46 eps Ori  ·  48 sig Ori  ·  49 d Ori  ·  50 zet Ori  ·  51 b Ori  ·  Alnilam  ·  Alnitak  ·  B33  ·  Flame Nebula  ·  Great Orion Nebula  ·  Hatysa  ·  Horsehead nebula  ·  IC 423  ·  IC 426  ·  IC 430  ·  IC 431  ·  IC 432  ·  IC 434  ·  And 51 more.
Getting plate-solving status, please wait...
Orion & Friends, 



    
        

            Steve Ludwig
Powered byPixInsight

Orion & Friends

Getting plate-solving status, please wait...
Orion & Friends, 



    
        

            Steve Ludwig
Powered byPixInsight

Orion & Friends

Equipment

Acquisition details

Dates:
March 24, 2020
Frames:
31×120(1h 2′)
Integration:
1h 2′
Avg. Moon age:
0.09 days
Avg. Moon phase:
0.01%

RA center: 05h33m09s.2

DEC center: -02°4427

Pixel scale: 12.988 arcsec/pixel

Orientation: -65.591 degrees

Field radius: 6.137 degrees

More info:Open 

Resolution: 2855x1856

File size: 3.7 MB

Data source: Backyard

Description

Equipment

- Nikon D3300 (unmodified)

- Samyang 135mm f2 @ f2

- Skywatcher Star Adventurer Pro Pack

- no-name tripod

Acquisition

- 31 light frames x 120 s = 1 h 30 s total exposure time

- no dark, flat, bias frames

- no filters

- ISO 100

- Bortle 4 zone

Stacking

-> light frames stacked in "Deep Sky Stacker" (DSS)

-> bilinear debayer method

-> median kappa sigma clipping method

Processing in Pixinsight

-> opened unmodified TIF

-> STF stretch

-> dynamic crop

-> dynamic background extraction

-> background neutralization

-> color calibration

-> HDR multiscale transform to reveal more details in M42 core

-> SCNR green to remove green (noise) pixels and to improve noise

-> use of Starnet++ module to separate stars and background

Stars

-> curves transformation to increase saturation

-> invert image

-> SCNR green to remove purple star fringes

-> invert image

Background

-> range selection to generate lightness mask that covers all nebula

-> curves transformation to increase saturation of all nebula

-> invert mask

-> curves transformation to massively reduce saturation of background (color noise reduction)

-> remove mask

-> ACDNR with integrated lightness mask function to reduce noise of background and darker nebula parts

-> pixel math to recombine stars and background

-> final histogram transformation

-> resample 50%

-> saved as jpg

Comments

Revisions

  • Orion & Friends, 



    
        

            Steve Ludwig
    Original
  • Final
    Orion & Friends, 



    
        

            Steve Ludwig
    D

D

Description: I had another look at my Orion image and noticed that it was massively over-processed. My new revision looks much more natural. Furthermore, I was able to remove purple star fringes (see processing details).

Uploaded: ...

Sky plot

Sky plot

Histogram

Orion & Friends, 



    
        

            Steve Ludwig