DESCRIPTION: Three session integration of M31.
OBJECT: Messier 31, The Andromeda Galaxy, apparent magnitude 3,4, apparent dimension 3,2° x 1°
CALIBRATION: RA center 0h 43m, DEC center +41°13’, Field radius 2,7°, Image pixel scale 4,2 arcsec/px, Image size 3840 x 2560 px.
GEAR: Nikon Z7 Kolari Full Spectrum + Nikkor Z 400/4,5, Astronomic UV/IR/L3 Clip in filter (session1 and2,) Astronomic CLSCCD Clip in filter (session3) , Rollei Astroklar light pollution filter (session 1 and 2), Dew heater strip, Sensor pixel scale 2,25 arcsec/px, tracking mount iOptron HEM27EC - iPolar alignment, No auto guiding.
ACQUISITION: Three session, Struz, CZ:
Session 1 - August 20, 2023, Subexposure 180s, f 4,5, ISO 400, Interval 10 s, RAW-L, Lights 42x, Bias 22x, Flats 22x.
Session 2 - August 23, 2023, Subexposure 180s, f 4,5, ISO 400, Interval 10 s, RAW-L, Lights 22x, Bias 22x, Flats 22x
Session 3 - September 16, 2023, Subexposure 180s, f 4,5, ISO 1600, Interval 10 s, RAW-L, Lights 26x, Bias 22x, Flats 22x
Total exposure time 270 min. Night, Backyard - Light pollution - Bortle 5.
STACKING AND POST PROCESSING: Stacking in Pixinsight, post processing in Pixinsight and Adobe Photoshop.
