Hemisphere:  Southern  ·  Constellation: Orion (Ori)  ·  Contains:  Great Nebula in Orion  ·  M 42  ·  M 43  ·  NGC 1973  ·  NGC 1975  ·  NGC 1976  ·  NGC 1977  ·  NGC 1980  ·  NGC 1982  ·  The star 42Ori  ·  The star 45Ori  ·  The star θ1Ori  ·  The star θ2Ori  ·  The star ιOri
The sword of Orion, 



    
        

            Victor Van Puyenbroeck
The sword of Orion
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The sword of Orion

The sword of Orion, 



    
        

            Victor Van Puyenbroeck
The sword of Orion
Powered byPixInsight

The sword of Orion

Acquisition details

Dates:
Nov. 30, 2016
Frames:
10×1(10″) ISO1600
10×15(2′ 30″) ISO1600
10×4(40″) ISO1600
44×60(44′) ISO1600
Integration:
47′ 20″
Flats:
21
Bias:
72
Avg. Moon age:
0.88 days
Avg. Moon phase:
0.88%
Bortle Dark-Sky Scale:
7.00
Temperature:
-4.00

Basic astrometry details

Astrometry.net job: 1436019

RA center: 05h35m08s.9

DEC center: -05°1503

Pixel scale: 2.665 arcsec/pixel

Orientation: 76.153 degrees

Field radius: 0.888 degrees

Resolution: 1988x1344

File size: 1.1 MB

Data source: Backyard

Description

The original images (rev. A and B) show M42 in heavy light pollution, taken from the city center on Feb 24, 2016.

I revisited this popular target after 9 months, this time from my dark site (red zone, Bortle 7) and doubled the integration time. Separate exposures were taken for the core, stacked in DSS and layered in StarTools.

Original description:

"I wonder whether filters will increase the quality of my subs, since I cannot expose for longer than 30 sec at ISO-1600 without overexposing... Also, I need to find out what's causing the black circles in the image. Please post any ideas in the comments! Edit B: included 20 Flats and re-stretched the image more conservatively, looks better now!"

Original technical card:

40x30" ISO1600

20 Flats (added in revision B)

72 Bias (added in revision B)

Bortle Dark-Sky Scale: 9.00

Orion ShorTube 80, EQ5 Pro and 450D

Comments

Revisions

  • The sword of Orion, 



    
        

            Victor Van Puyenbroeck
    Original
  • The sword of Orion, 



    
        

            Victor Van Puyenbroeck
    B
  • The sword of Orion, 



    
        

            Victor Van Puyenbroeck
    C
  • The sword of Orion, 



    
        

            Victor Van Puyenbroeck
    D
  • Final
    The sword of Orion, 



    
        

            Victor Van Puyenbroeck
    E

C

Description: New stack from better location

Uploaded: ...

D

Description: Reprocessed 60sec exposures in PixInsight

Uploaded: ...

E

Description: Reprocessed as HDR

Uploaded: ...

Sky plot

Sky plot

Histogram

The sword of Orion, 



    
        

            Victor Van Puyenbroeck