NGC 7640 galaxy in Andromeda

[Dan_Paris]

Hi,

 

NGC 7640 is a nearly edge-on barred spiral galaxy in Andromeda, with a relalatively large angular size but low surface brightness.

Last week I shot nearly 4 hours of luminance and 1h30 of chrominance with my 8" f/4 newtonian astrograph, from my garden in Paris' suburbs (Bortle 7/8).

 

Here is a crop on the galaxy

 

 

And the full FOV

 

As this field is close to the galactic plane, there aren't much galaxies in the background.

 

Thanks for looking and clear skies,

 

Dan

 

Technical data
200/800 custom Newtonian astrograph with Romano Zen optics and carbon fiber tube
AP900 CP4 mount on Losmandy HD tripod
TS 2.5" Riccardi-Wynne corrector
ASI183mm
ZWO LRGB filters
Guiding : ZWO OAG + ASI120mm mini + AsiairV1
Luminance : 230 *60sec at -10°C, gain 111
Chrominance : 30*60sec at -10°C, gain 111 for each channel
Darks, flats and synthetic biases
Conditions : Bortle 7/8 skies in Paris' suburbs (20km from the Eiffel tower), average seeing (2.4" after stacking) and transparency
Preprocessing and stacking with Siril, processing with Pixinsight and Rawtherapee

 

 

 

Edited September 5, 2022 by Dan_Paris