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Contains:  IC 2162
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Sh2-254 - Orion Emission Complex, 


            Gary Imm
Sh2-254 - Orion Emission Complex

Sh2-254 - Orion Emission Complex

Technical card

Resolution: 2551x2203

Dates:Jan. 24, 2019Jan. 27, 2019

Astrodon Blue 31mm Gen2 I-Series: 120x30" (gain: 139.00) -20C bin 1x1
Astrodon Green 31mm Gen2 I-Series: 120x30" (gain: 139.00) -20C bin 1x1
Astrodon Ha 31mm 5nm: 24x300" (gain: 300.00) -20C bin 1x1
Astrodon Red 31mm Gen2 I-Series: 120x30" (gain: 139.00) -20C bin 1x1

Integration: 5.0 hours

Avg. Moon age: 20.14 days

Avg. Moon phase: 69.50% job: 2517842

RA center: 93.146 degrees

DEC center: 18.019 degrees

Pixel scale: 0.783 arcsec/pixel

Orientation: 73.568 degrees

Field radius: 0.366 degrees

Locations: Backyard (Mag 20.8), Onalaska, Texas, United States

Data source: Backyard


This image captures a series of five circular Sharpless HII emission objects located 8000 light-years away in the constellation of Orion. I have attached an annotated image to assist with the description below.

The three main objects, top to bottom, are Sh2-254, Sh2-257, and Sh2-255. To the right of Sh2-257 is the smaller nebula, Sh2-256. At the bottom of the image is the smallest of these 5 Sharpless nebulae, Sh2-258. In the annotated image, I have circled the ionizing stars which have been identified for each of these HII regions. A massive young star cluster, S255-2, is also identified on the annotated image. This cluster is well hidden by the extreme amount of dust in this region.

Thin brownish dust lanes wind through all of these nebulae. Several darker black patches of dust, dark enough to blot out all of the stars behind them, are also seen towards the center of the image.

This is a bright object, easy to image and process. It is fairly accessible for most of us in the northern hemisphere. I am not why it is not a more popular object.



Gary Imm
License: None (All rights reserved)


  • Final
    Sh2-254 - Orion Emission Complex, 


            Gary Imm
  • Sh2-254 - Orion Emission Complex, 


            Gary Imm



Sky plot

Sky plot


Sh2-254 - Orion Emission Complex, 


            Gary Imm