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Target

M 31 — The Andromeda Galaxy

Frame / Rev
001 / B
Integration
32h 48m
M 31 — The Andromeda Galaxy
HaLRGB · 3nmRedCat 51 WIFDQHY Minicam8M (IMX585) · 2.39″/px
Zoom 1:1
Catalog
Andromeda Galaxy · M 31 · HD 3969 · NGC 224 · UGC 454
Class
Galaxy
Constellation
Andromeda
Distance
2,544,020 ly
Coordinates
RA 10.684708° · Dec +41.268750°
Palette
HaLRGB
Sessions
8 nights · 20 Aug – 14 Sep 2026
Sky
Bortle 9

Target & processing

Messier 31, the Andromeda Galaxy, appears as a bright, hazy patch in the northwestern sky, its central core glowing with a steady, otherworldly light. As a distant, active galactic nucleus, it is a remnant of a supernova that energized a supermassive black hole at its center. The galaxy resides in the constellation Andromeda, whose shape and stars stretch across the northern sky like a celestial tapestry. At 2,544,020 light-years from Earth, Messier 31 is a cosmic behemoth, a reminder of the universe's vast, uncharted expanse.

Per-filter integration

Hα 25.2% · 8h 10mL 50.3% · 16h 19mR 9% · 2h 56mG 7.3% · 2h 22mB 8.2% · 2h 38m
Hα 3nm
8h 10m
L
16h 19m
R
2h 56m
G
2h 22m
B
2h 38m
KeptRejected at integration
Where in the sky
M 31 marked on the Andromeda figure
Andromeda
Equipment
Optics
William Optics RedCat 51 · 250mm f/4.9
Camera
QHY MiniCam8M · IMX585 · 2.9µm
Filters
XiMei 3nm Hα / OIII / SII + XiMei L-Pro
Mount
ZWO AM3 harmonic, no counterweight
Guiding
Uniguide 32mm + ZWO ASI120MM Mini
Control
Mele Quieter 4C · NINA + PHD2
Site
Montréal, QC · Bortle 9 · 45.5° N
2 processings of M 31
  1. FirstSep 2024 · 6h 22m
  2. New rig*Sep 2026 · 32h 48m — you are here2.74″/px → 2.58″/px · RGB → HaLRGB 3nm · +26h 26m · +8 nights
Adjacent frames
Sh2-114
Sh2-114
Aug 2026 · 17h 03m
Sh2-157
Sh2-157
Aug 2026 · 28h 45m
V1769 Cyg
V1769 Cyg
Jul 2026 · 24h 55m
NGC 6888
NGC 6888
Jul 2026 · 19h 05m