NGC7331

NGC 7331, also known as Caldwell 30, is an unbarred spiral galaxy about 40 million light-years (12 Mpc) away in the constellation Pegasus. It was discovered by William Herschel in 1784. NGC 7331 is the brightest galaxy in the field of a visual grouping known as the NGC 7331 Group of galaxies. The other members of the group are the lenticular or unbarred spirals NGC 7335 and 7336, the barred spiral galaxy NGC 7337 and the elliptical galaxy NGC 7340. These galaxies lie far in the background at distances of approximately 332, 365, 348 and 294 million light years, respectively.

 

Telescope : T120 (www.obs-hp.fr/guide/t120.shtml)

Camera : Andor iKon-L 936 (www.obs-hp.fr/guide/camera-120/camera-120.shtml)

Filters : UBVRI Filter Set (www.obs-hp.fr/guide/camera-120/ubvri.shtml)

 

Acquisition :

Lights : RGB, total ~15min

Darks : no darks

Flats : 25 flats for each color

Bias : 25

 

Software :

Pre-processing : DeepSkyStacker

Processing : Siril, Pixinsight

Post-processing : Lightroom, Photoshop

Done