The Bode's Galaxy In Ursa Major  (Messier 81)

A spiral galaxy in the constellation Ursa Major.
As it feels like the season is coming to an end, I wanted to photograph a galaxy before it was over, so I chose M81.
I had planned to collect signal over 2-3 days, but the sky doesn't open up after the first day, so I gave up and edited with just one night's signal.
Since there wasn't enough RGB, I tried editing by using Lumi (brightness) to focus on the dark bands around the core.
This galaxy is quite faintly covered in bell light, but I've already peeled back much of the veil, so I made sure to give it a slight boost to bring out the molecular clouds that are widespread around it.

おおぐま座にある渦巻銀河。
シーズンが終わりかけてる気がするので、終わる前に銀河を撮っておきたくて選んだのがM81。
2−3日がかりでシグナルを集める予定だったが、初日以降空は開かないので、諦めて一晩だけのシグナルで編集。
RGBが足りないのでLumi（輝度)を活用したコア周辺の暗黒帯に着目した編集にしてみた。
この銀河は結構淡ーいベルを被った銀河だがベールをかなり剥がしてしまったので、その分周辺にひろがある分子雲を少しブーストして出してみた。

Place: Astropical@CSky Observatory Saraburi　Thailand (Bortle Class 3, Moon Phase 8.4%)
Shot Date:20th / Feb / 2026 20:37 (UTC+7)
TS TSRC10T Carbon Truss Prime Focus　(250mm F/8 f/2000mm)
Filter: Antlia V-Pro Lumi, SVBony RGB Sets
L :50X180Secs Total 150minutes
R :10X180Secs Total 30minutes
G :10X180Secs Total 30minutes
B:10X180Secs Total 30minutes

Total 4hours

Palette: Target L-RGB
Star L-RGB
Gain: 200 , Offset 5
CCD: Player One Artemis-M Pro Bin2
Mount :iOptron CEM70G
De-Rotator : Wanderer Mini V2 (0 Deg)
Guide: SVBony 60mm F/4, QHY290C.
Controler: NINA
Pre-Processing APP Drizzle Droplet 0.9 Scale 1.0
Post-Processing PI,Affinity
Shot By Taro Seki Astropical.uk

M81-RGB_1-Edit01-Finish