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Contains:  IC 1795, NGC 896
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IC 1795 - Fishhead Nebula

Technical card

Resolution: 4243x3114

Dates:Jan. 8, 2019Jan. 9, 2019Jan. 10, 2019

Astrodon Blue 31mm Gen2 I-Series: 60x30" (gain: 139.00) -20C bin 1x1
Astrodon Green 31mm Gen2 I-Series: 60x30" (gain: 139.00) -20C bin 1x1
Astrodon Ha 31mm 5nm: 24x300" (gain: 300.00) -20C bin 1x1
Astrodon OIII 31mm 3nm: 24x300" (gain: 300.00) -20C bin 1x1
Astrodon Red 31mm Gen2 I-Series: 60x30" (gain: 139.00) -20C bin 1x1
Astrodon SII 31mm 5nm: 24x300" (gain: 300.00) -20C bin 1x1

Integration: 7.5 hours

Avg. Moon age: 3.07 days

Avg. Moon phase: 10.78% job: 2510731

RA center: 37.122 degrees

DEC center: 62.019 degrees

Pixel scale: 0.782 arcsec/pixel

Orientation: 349.252 degrees

Field radius: 0.572 degrees

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

Data source: Backyard


This object is a wonderfully complex and beautiful emission nebula located 6,000 light years away in the constellation of Cassiopeia.

I am not sure why this is called the Fishhead Nebula - it looks like a whole fish to me. Anyway, this object features glowing gas fronts and dark lanes of dust clouds. Scientists believe that this is a star forming region and that a number of young, massive stars are forming in the glowing region at the fish's mouth. The bright nebula spans 70 light years.

My favorite part of the image are the silhouetted dense, dark dust lanes which weave through the bright emission area. It is hard to imagine how the dust in these areas is so dense that it completely blocks bright starlight in the background. Comparing the dust lanes on the left and right side of the image, I wonder if they are similar? They look much different - brownish, detailed with depth on the left, and simply black and silhouetted on the right - but that difference may be due simply to the intense background emission light source on the right side of the image.

I also like how the color transitions from orange (due to dust) on the left to blue (due to OIII emission) on the right, with a subtle transition of a purplish hue in the middle.



Gary Imm
License: None (All rights reserved)

Sky plot

Sky plot


IC 1795 - Fishhead Nebula, 


            Gary Imm