Owl Nebula (M 97)

Posted: Nov 24th, 2021

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NGC

Technical Info

Telescope/Lens: Sky-Watcher 130pds

Camera: QHY5III178M Cool

Mount: HEQ5 Pro

Guide Scope: Svbony 60/240mm

Guide Camera: Qhy5L-II-c

Software: APP, Photoshop, Topaz Denoise AI

Accessories: Baader MPCC Mk3, Svbony MFW

Exposure:

87 x 600" ISO/Gain: 10 - Baader Ha 7nm

51 x 600" ISO/Gain: 10 - Astronomik OIII 6nm

Yellow zoneLight Pollution:

Starye Keny, Russia

Mar 25th, 2021

OWL NEBULA (M 97)

Telescope/Lens: Sky-Watcher 130pds
Camera: QHY5III178M Cool
Mount: HEQ5 Pro
Guide Scope: Svbony 60/240mm
Guide Camera: Qhy5L-II-c
Software: APP, Photoshop, Topaz Denoise AI
Accessories: Baader MPCC Mk3, Svbony MFW

Starye Keny, Russia
Light Pollution: Yellow zone

Exposure:
87 x 600" ISO/Gain: 10 - Baader Ha 7nm 
51 x 600" ISO/Gain: 10 - Astronomik OIII 6nm

4 incomplete nights from March 25-30 and half a night on April 5, 2021.
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<br>I shot during the Moon's bright phases, when galaxies couldn't be captured. For some reason, noticeable banding appeared in the oxygen [OIII] data—possibly due to issues with calibration frames or too low gain (though the hydrogen [Ha] data was fine). The oxygen data also suffered more from moonlight and backscatter from the snow. The processing had to be quite aggressive to pull out the outer halo without amplifying the banded noise. I should probably add a few more hours of oxygen data without the Moon and RGB stars in the spring.
<br>
<br>Resized to 50% of the original.

Original size: https://deepskyhosting.com/l5JEoZj
Author: alesterre

23 h 0 m

1966

4 incomplete nights from March 25-30 and half a night on April 5, 2021.

I shot during the Moon's bright phases, when galaxies couldn't be captured. For some reason, noticeable banding appeared in the oxygen [OIII] data—possibly due to issues with calibration frames or too low gain (though the hydrogen [Ha] data was fine). The oxygen data also suffered more from moonlight and backscatter from the snow. The processing had to be quite aggressive to pull out the outer halo without amplifying the banded noise. I should probably add a few more hours of oxygen data without the Moon and RGB stars in the spring.

Resized to 50% of the original.

Resolution: 1454x959 px

Scale: 264 KB