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BAA Images Picture of the week

Observation by Ian Sharp: Messier 31

Uploaded by

Paul Downing, FRAS


Ian Sharp


2021 Oct 08 - 23:00


2021 Oct 15 - 13:18


The Andromeda Galaxy (M31)

Planetarium overlay


Leo Minor

Field centre

RA: 10h22m
Dec: +32°08'
Position angle: +84°33'

Field size

5°11' × 3°22'

  • Takahashi FSQ-85EDX F/5.3 Apochromatic Refractor with 1.01x > field flattener
  • Skywatcher AZ-EQ6 Pro mount
  • QHY268C cooled CMOS camera (one-shot colour, full 16-bit) at -15C
  • Starlight Xpress 5 x 2″ filter wheel
  • ZWO 60mm. Focal length is 280mm, F/4.67 guidescope
  • ZWO ASI290MM Mini mono guide camera

10 hours of 4 minute RGB broadband colour exposures and 7 hours of 10 minute exposures in narrowband with the Optolong L-Extreme dual band filter for the Ha regions.


Ham, UK

Target name

Messier 31


Messier 31

About this image

The Andromeda Galaxy, also known as Messier 31, M31, or NGC 224 and originally the Andromeda Nebula, is a barred spiral galaxy approximately 2.5 million light-years from Earth and the nearest large galaxy to the Milky Way.  In this excellent image by Ian the H-alpha component was combined into the red channel from the RGB and all processing was performed using PixInsight.

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