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Observation by Graeme Coates: M51 Just Briefly in Passing

Uploaded by

Graeme Coates

Observer

Graeme Coates

Observed

2021 Feb 18 - 23:34

Uploaded

2021 Feb 19 - 12:03

Objects

M51
NGC5195
IC4278

Planetarium overlay









Constellation

Canes Venatici

Field centre

RA: 13h29m
Dec: +47°13'
Position angle: +179°54'

Field size

0°25' × 0°18'

Equipment
  • Home built 350mm Newtonian
  • Losmandy Titan
  • ST-2000XM
  • Astrodon C
Exposure

34 x 120s

Location

Standlake

Target name

M51

Title

M51 Just Briefly in Passing

About this image

I tend to not use my home scope so much for deep sky work these days, instead using it for variable star work (the weather is unreliable in the UK - it means it's sometimes just impossible to finish projects off!).

I had been gathering data on V447 UMa and V451 Dra, and with high thin cloud coming through, I thought I'd grab some "nonsense" data on M51. I'd never imaged this before, and wanted to see what the 14" newtonian could pickout in the short time I had available, especially since I'd resolved the mechanical issue resulting in some of the poor tracking that I'd had on my home kit (it doesn't matter so much for variable star work, more so for long exposure astrophotography!).

I landed up with just over an hour of data through the "C" filter - reduced in PI, and then with Mure Denoise, Deconvolution, Masked and Arcsinh stretches, histogram adjustments with HDRMT, LHE.

Unsurprisingly, it could be deeper, and a bit less noisy in the background/faint regions (given the short total exposure), but there's some decent detail in the galaxy itself.

 

EDITED - Another stab at this from scratch, handled noise a bit better and a bit less harsh.  

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