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Contains:  M 109, NGC 3992
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Galaxy M109 & Friends (LRGB), 


            Scott Davis
Galaxy M109 & Friends (LRGB)

Galaxy M109 & Friends (LRGB)

Technical card

Resolution: 1500x1112

Dates:Feb. 8, 2016

Astrodon 31mm B Tru-Balance E-Series Gen 2: 20x120" -20C bin 2x2
Astrodon 31mm G Tru-Balance E-Series Gen 2: 17x120" -20C bin 2x2
Astrodon 31mm L Tru-Balance E-Series Gen 2: 104x120" -20C bin 1x1
Astrodon 31mm R Tru-Balance E-Series Gen 2: 20x120" -20C bin 2x2

Integration: 5.4 hours

Darks: ~30

Flats: ~30

Flat darks: ~30

Bias: ~30

Avg. Moon age: 29.39 days

Avg. Moon phase: 0.02%

Bortle Dark-Sky Scale: 7.00 job: 959071

RA center: 179.595 degrees

DEC center: 53.082 degrees

Pixel scale: 3.415 arcsec/pixel

Orientation: -91.867 degrees

Field radius: 0.886 degrees

Locations: My Backyard, Clovis, California, United States


Messier 109, also catalogued as NGC 3992, is a barred spiral galaxy estimated to be 83 million light years from Earth (but with an error of +/- 25%).

The gradient in the lower-right is not a processing error; in fact, it is the glow from the bright star Phad (also known as Phecda or Gamma Ursae Majoris), which sits just off frame. Because it partially tells the story of just how bright this star is compared to others in the area, I decided to leave the glow in the picture instead of editing it out.

The galaxy near the upper-left corner is PGC 37735.

This image was a new challenge for me, because it was my first attempt at imaging a galaxy from my red zone light pollution. To be honest, I was astonished I was able to capture anything at all, let alone a decent-quality image.



Scott Davis
License: Attribution-NonCommercial-NoDerivs Creative Commons

Sky plot

Sky plot


Galaxy M109 & Friends (LRGB), 


            Scott Davis