Messier 31

• Photographer : Hyunwoo Kim

• DATE : 30th Oct 2021, 4th, 5th, 6th Nov 2021

• Place : Danyang, Hongcheon, Hwacheon (Bortle class 4), Gimpo (Bortle class 5)

• Telescope : SDT80 (FL 384mm/F4.8)

• Tripod & Mount : IEQ45

• Guide scope/camera : ZWO mini guide scope / ASI 120mm mini

• Camera : ASI1600mm pro (-20 deg)

• Filter : Optolong LRGBH

• Exposure : Total 9.13 hours

Optolong L filter: 180s x 35 (gain 76)

Optolong R filter: 180s x 26 (gain 76)

Optolong G filter: 180s x 32 (gain 76)

Optolong B filter: 180s x 30 (gain 76)

Optolong Ha filter: 300s x 18, 180s x 17 (gain 200)

• Software : Pixinsight