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Observation by Les Dickens: Messier 51 ("Whirlpool")

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Les Dickens


Les Dickens


2018 May 14 - 00:00


2018 May 16 - 14:29


The Whirlpool Galaxy (M51)

Planetarium overlay


Canes Venatici

Field centre

RA: 13h29m
Dec: +47°12'
Position angle: -97°01'

Field size

0°48' × 0°33'

  • 200mm F6 Newtonian
  • QHY9s mono camera
  • Processed with IRIS software

60x70s (luminance); 15x70s (S-II); 15x70s (O-III); 15x70s (H-α)


Cheltenham, Glos.

Target name

NGC 5194 (M51)


Messier 51 ("Whirlpool")

About this image

F6 Newtonian telescope + QHY9S mono camera.

A first attempt at using LRGB techniques.  Luminance 60x70s and 15x70s each of S-II (red), O-III (green) and H-β (blue).  Relatively successful, but I was almost caught out by not realising the need to refocus the telescope when switching to the narrow band filters.  I found it quite difficult to get good focus given the faintness of the filtered images .

All images processed using IRIS software.

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