Hemisphere:  Northern  ·  Contains:  NGC 1491  ·  NGC1491  ·  Sh2-206
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NGC 1491 in HOO with OSC, 


            Cedric Raguenaud
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NGC 1491 in HOO with OSC

Imaging telescopes or lenses: Skywatcher 300/1500

Imaging cameras: QHYCCD 183C

Mounts: Skywatcher EQ8 pro

Guiding telescopes or lenses: TS-Optics OAG

Guiding cameras: ZWO ASI120MM

Focal reducers: Baader MPCC Mark III Coma Corrector

Software: Sequence Generator Pro  ·  Gimp 2.10  ·  PixInsight 1.8 Ripley

Filters: STC Dual Narrowband filter

Accessory: Home made focuser

Dates:Sept. 11, 2020Sept. 12, 2020Sept. 13, 2020Sept. 15, 2020Sept. 16, 2020

Frames:STC Dual Narrowband filter: 88x600" (gain: 16.00) -15C bin 1x1

Integration: 14.7 hours

Avg. Moon age: 25.66 days

Avg. Moon phase: 18.99%

Bortle Dark-Sky Scale: 4.00

Mean SQM: 21.57

Astrometry.net job: 3874837

RA center: 4h 3' 16"

DEC center: +51° 19' 36"

Pixel scale: 0.763 arcsec/pixel

Orientation: -7.042 degrees

Field radius: 0.263 degrees

Resolution: 2048x1405

Locations: ORCA Observatory, Near Matha, Charente-Maritime, France

Data source: Own remote observatory

Remote source: Non-commercial independent facility


The OIII layer was extremely noisy due to faintness of the emission, which was impossible to remove. As a photographer noise doesn't bother me, on the contrary, I like the texture. But for astronomy it's more usual to remove all noise. So I park this here to wait for clear skies or next year to add signal to the OIII layer.



Cedric Raguenaud
License: None (All rights reserved)

Sky plot

Sky plot


NGC 1491 in HOO with OSC, 


            Cedric Raguenaud

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STC Dual Narrowband filter images