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Old 07-09-2022, 09:39 PM
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AstroViking (Steve)
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Join Date: Mar 2022
Location: Melbourne
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NGC55 - A space whale

Hey all,

I had hoped to add more data to this, but the clouds tonight put an end to that adventure. Maybe when the skies are clear I can add more data to this one.

This is 2 hours of data (120 x 60 second subs @ ISO400), but taken at a low elevation, so plenty of light pollution to look through. If I didn't have to go to work, I would have definitely taken a lot more images as the whale swam higher into the night sky.

Processed in Siril (lights, darks, flats and bias frames; background removal; 2 asinh stretches; no colour calibration or histogram stretch; green noise removal) and Affinity Photo.

Interestingly enough, NOT doing a histogram stretch in Siril gave better results - far less murky background noise, and an easier to work with galactic core.

Next time, I think I'll try for 2 minute subs at ISO 200.

Cheers,
V

Boring bit:
120 subs of 60 seconds, ISO 400
HEQ5-Pro + SW ES72ED@420mm + Nikon D7100 + Guiding
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