Hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  IC 1795  ·  IC1795  ·  NGC 896  ·  NGC896
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Fishhead Nebula (NGC 896, IC 1795), 


            Gary Lopez
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Fishhead Nebula (NGC 896, IC 1795)

Imaging telescopes or lenses: Sky-Watcher Esprit 100ED  ·  William Optics FLT 132 Triplet APO f/7

Imaging cameras: ZWO ASI1600MM Cooled PRO

Mounts: Orion Atlas EQ-G

Guiding telescopes or lenses: Orion 50mm Guide Scope with helical focusing

Guiding cameras: Lacerta M-Gen II Autoguider

Focal reducers: William Optics Flattener 68III

Software: Adobe Lightroom CC  ·  Photoshop CC  ·  Main Sequence Software Sequence Generator Pro, v3.0  ·  Pleaides PixInsight Core 1.8

Filters: Astrodon R Gen 2 E-series 31mm  ·  Astrodon G Gen 2 E-series 31mm  ·  Astrodon B Gen 2 E-series 31mm  ·  Astrodon OIII 3nm-31mm  ·  Astrodon SII 3nm-31mm  ·  Astrodon Ha 3nm-31mm

Dates:Oct. 4, 2018Oct. 6, 2018Oct. 7, 2018Oct. 8, 2018Oct. 11, 2018Oct. 23, 2019Oct. 24, 2019

Astrodon B Gen 2 E-series 31mm: 35x60" (gain: 139.00) -15C bin 1x1
Astrodon G Gen 2 E-series 31mm: 36x60" (gain: 139.00) -15C bin 1x1
Astrodon Ha 3nm-31mm: 261x180" (gain: 139.00) -15C bin 1x1
Astrodon Ha 3nm-31mm: 211x180" (gain: 200.00) -15C bin 1x1
Astrodon OIII 3nm-31mm: 106x180" (gain: 139.00) -15C bin 1x1
Astrodon R Gen 2 E-series 31mm: 35x60" (gain: 139.00) -15C bin 1x1
Astrodon SII 3nm-31mm: 100x180" (gain: 139.00) -15C bin 1x1

Integration: 35.7 hours

Darks: ~30

Bias: ~50

Avg. Moon age: 22.81 days

Avg. Moon phase: 13.38%

Bortle Dark-Sky Scale: 4.00

Astrometry.net job: 3067324

RA center: 2h 27' 48"

DEC center: +61° 57' 41"

Pixel scale: 0.862 arcsec/pixel

Orientation: -117.784 degrees

Field radius: 0.598 degrees

Resolution: 3983x3011

Locations: Monterey Pines Observatory, Monterey, California, United States

Data source: Backyard


The Fishhead Nebula is a knot of gas and dust on the western edge of the Heart Nebula (IC 1805). This bright nebula is 7,500 light years away, located in the Perseus Arm of our Milky Way Galaxy. The object is dominated by dust and hydrogen gas, with good measures of oxygen and sulfur gas.

In October 2018 I collect 25.1 hours of Ha, OIII, SII, and RGB data for a wide view of this region (1.84 degrees X 1.39 degrees) using a SW Esprit 100ED (https://www.astrobin.com/372144/D/). This year I collected an additional 10.6 hours of Ha data with a tighter FOV (1.09 degrees X 0.83 degrees) using a WO FLT132. In this image, I combined the two data sets using the new, tighter FOV data to create a luminance mask to produce a cropped version of the original 2018 image.