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Contains:  M 31, Great Nebula in Andromeda, NGC 224, M 32, NGC 221, M 110, NGC 205
Getting plate-solving status, please wait...
M31 - Yet another Andromeda shot, 


M31 - Yet another Andromeda shot

M31 - Yet another Andromeda shot

Technical card

Resolution: 8484x6200

Dates:Jan. 10, 2019Feb. 5, 2019

ZWO B 36mm: 252x30" -20C bin 2x2
ZWO G 36mm: 250x30" -20C bin 2x2
ZWO L 36mm: 251x30" -20C bin 1x1
ZWO R 36mm: 235x30" -20C bin 2x2

Integration: 8.2 hours

Darks: ~50

Flats: ~50

Flat darks: ~50

Avg. Moon age: 2.26 days

Avg. Moon phase: 8.54%

Bortle Dark-Sky Scale: 6.00 job: 2517512

RA center: 10.686 degrees

DEC center: 41.260 degrees

Pixel scale: 1.025 arcsec/pixel

Orientation: 269.640 degrees

Field radius: 1.496 degrees

Data source: Backyard


I started shooting M31 with a tripod, a DSLR and a 400mm lens. First attempt I captured 600 subs of ... Deneb :-D
After learning how to find it I spent entire nights shooting, recentering it every 3min (0.8s subs @ ISO3200). I managed to capture it, but boy those stars looked like 1I/ʻOumuamua :')
The SNR was also terrible. I even tried a 3000 subs with little success apart heating my appartment for 110 hours straight.

Then came the time of the StarAdventurer, I was and still am a noob. Flexure was my world and proper guiding nearly impossible. Let us not talk about noise.

Now I switched to a G11 and an astro camera. I am still struggling, still not satisfied, but I am happy of the progress and am proud to present you my new attempt in shooting M31. I am finally happy with deconvolution (turns out my issues were due to a bad star mask that included nebulosity), and with noise reduction thanks to Jon Ristas wonderful method (PixInsight - Jon Ristas TGVDenoise Applied).

There are optical aberrations in the corners, especially top left. Are those astigmatism?
Also there is what looks like chromatic abberations, a blue spot on top left part of bright white stars. I have been having consistent eccentricity issues with blue and OIII filters. Does this confirm chromatic abberations induced by the lens?

I am looking forward to your comments in English or French, thanks!



License: None (All rights reserved)

Sky plot

Sky plot


M31 - Yet another Andromeda shot,