Hemisphere:  Northern  ·  Constellation: Perseus (Per)  ·  Contains:  NGC 1491  ·  NGC1491  ·  Sh2-206
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NGC1491 - The Fossil Footprint Nebula, 


            Vincent Savioz
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NGC1491 - The Fossil Footprint Nebula

Imaging telescopes or lenses: TS-Optics TS 100 Quadruplet

Imaging cameras: ZWO ASI1600MM-C

Mounts: SkyWatcher EQ6 PRO GOTO

Guiding telescopes or lenses: Orion 80/400

Guiding cameras: Orion Starshoot autoguider

Software: PHD Lab PhD 2 Guiding  ·  Pleyades Astrophoto PixInsight Ripley  ·  Main Sequence Software SGPro  ·  Sequence Generator Pro  ·  Photoshop

Filters: Astrodon R Gen.2 E-series 36mm  ·  Astrodon G Gen.2 E-series 36mm  ·  Astrodon B Gen.2 E-series 36mm  ·  Astrodon L Gen.2 E-series 36mm  ·  Astrodon Ha 3nm 36mm

Accessory: PrimaLuceLab Sesto Senso focuser  ·  ScopeDome 3M  ·  ZWO Filterwheel EFW 7x 36mm

Dates:Oct. 30, 2020Oct. 31, 2020Nov. 6, 2020Nov. 8, 2020

Astrodon Ha 3nm 36mm: 100x300" (gain: 200.00) -20C bin 1x1
Astrodon OIII 3nm 36mm: 80x300" (gain: 200.00) -20C bin 1x1
Astrodon SII 3nm 36mm: 80x300" (gain: 200.00) -20C bin 1x1

Integration: 21.7 hours

Darks: ~50

Flats: ~30

Bias: ~50

Avg. Moon age: 17.65 days

Avg. Moon phase: 80.09%

Bortle Dark-Sky Scale: 4.00

Temperature: 5.00

Astrometry.net job: 3996110

RA center: 4h 4' 15"

DEC center: +51° 12' 14"

Pixel scale: 1.345 arcsec/pixel

Orientation: 88.462 degrees

Field radius: 0.729 degrees

Resolution: 2759x2759

Locations: Home Observatory, Ayent, Valais, Switzerland

Data source: Own remote observatory

Remote source: Non-commercial independent facility


NGC 1491 (also designated SH2-206 and LBN 704) 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. HII regions are well known for being places where new stars are born and are created when ultraviolet radiation from hot stars ionizes the surrounding gas, causing it to glow in visible light. The surrounding dust is also heated by this radiation, so we also see it glow in infrared light. The entire nebula is quite irregular.
Source : irida-observatory.org

I honestly saw only a few pictures of this target on AstroBin, especially in Hubble palette. I thought it was a good idea to capture the nebula and its outer Ha halo (which is not often shown). Later, I was surprised to see how much Oiii there was in the core. After countless hours of processing, I managed to bring out the core and its beautiful blue tone. However, I had a hard time keeping the noise under control. Plus, the nebula might look a little bit fuzzy and noisy.
Overall, I’m happy with the result. Criticism and advice are welcome!