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Hemisphere:  Northern  ·  Contains:  NGC 1491
Getting plate-solving status, please wait...
Sh2-206 • NGC 1491 • Fossil Footprint Nebula in SHO, 


            Douglas J Struble
Sh2-206 • NGC 1491 • Fossil Footprint Nebula in SHO
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Sh2-206 • NGC 1491 • Fossil Footprint Nebula in SHO

Technical card

Imaging telescopes or lenses: Stellarvue SVX102T-R  ·  Explore Scientific 152 mm Carbon Fiber

Imaging cameras: ZWO ASI1600MM-PRO  ·  ZWO ASI1600MM-Cool

Mounts: Astro-Physics Mach 1 GTO  ·  Orion Atlas Pro AZ/EQ-G

Guiding telescopes or lenses: Stellarvue 50mm Guidescope  ·  Orion 80mm Short Tube

Guiding cameras: ASI224MC  ·  Starlight Xpress Lodestar x2

Software: Photoshop CC  ·  PHD2  ·  PixInsight  ·  SkySafari Pro

Filters: Astronomik SII 1.25" 6nm  ·  Astronomik Ha 6nm 1.25''  ·  Astrodon Ha 5nm  ·  Astrodon SII 3nm  ·  Astrodon OIII 3nm

Dates:Oct. 18, 2019Oct. 19, 2019Nov. 5, 2019Nov. 7, 2020Nov. 8, 2020Nov. 11, 2020

Astrodon Ha 5nm: 445x120" (gain: 200.00) -20C bin 1x1
Astrodon OIII 3nm: 559x120" (gain: 200.00) -20C bin 1x1
Astrodon SII 3nm: 272x120" (gain: 200.00) -20C bin 1x1
Astronomik Ha 6nm 1.25'': 244x120" (gain: 200.00) -20C bin 1x1
Astronomik SII 1.25" 6nm: 242x120" (gain: 200.00) -20C bin 1x1

Integration: 58.7 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 19.33 days

Avg. Moon phase: 57.11%

Bortle Dark-Sky Scale: 8.00

Basic astrometry details job: 4018799

RA center: 4h 3' 38"

DEC center: +51° 19' 33"

Pixel scale: 0.681 arcsec/pixel

Orientation: 68.515 degrees

Field radius: 0.275 degrees

Resolution: 2232x1860

Locations: Backyard White Zone Observatory, Taylor, MI, Michigan, United States

Data source: Backyard


I added on from a year ago trying to pull out more detail along with better processing skills.

NGC 1491 (also designated Sharpless SH2-206) is a bright emission nebula and HII region, located on the edge of a vast cloud region of neutral gas, about 10,700 light-years away in the Perseus arm of our Milky Way galaxy. The stellar wind from the O5V 11.2 magnitude star (BD +50 886) at its centre is forming a blister in the gas clouds immediately surrounding it while also eroding the gas clouds.



Douglas J Struble
License: None (All rights reserved)

Sky plot

Sky plot


Sh2-206 • NGC 1491 • Fossil Footprint Nebula in SHO, 


            Douglas J Struble

In these public groups

Sharpless2 Objects