Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  M 109  ·  NGC 3992
Galaxy M109 & Friends (LRGB), 



    
        

            Scott Davis
Galaxy M109 & Friends (LRGB)
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Galaxy M109 & Friends (LRGB)

Technical card

Imaging telescopes or lenses: Explore Scientific ED102 APO

Imaging cameras: QSI 683ws-8

Mounts: Celestron CGEM Hypertuned

Guiding telescopes or lenses: Orion ShortTube 80

Guiding cameras: Orion StarShoot Autoguider

Focal reducers: Astro-Tech AT2FF

Software: Sequence Generator Pro  ·  DeepSkyStacker  ·  RegiStar  ·  Photoshop CS6

Filters: Astrodon 31mm B Tru-Balance E-Series Gen 2  ·  Astrodon 31mm G Tru-Balance E-Series Gen 2  ·  Astrodon 31mm R Tru-Balance E-Series Gen 2  ·  Astrodon 31mm L Tru-Balance E-Series Gen 2

Accessory: Robofocus


Dates:Feb. 8, 2016

Frames:
Astrodon 31mm B Tru-Balance E-Series Gen 2: 20x120" (40') -20C bin 2x2
Astrodon 31mm G Tru-Balance E-Series Gen 2: 17x120" (34') -20C bin 2x2
Astrodon 31mm L Tru-Balance E-Series Gen 2: 104x120" (3h 28') -20C bin 1x1
Astrodon 31mm R Tru-Balance E-Series Gen 2: 20x120" (40') -20C bin 2x2

Integration: 5h 22'

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


Basic astrometry details

Astrometry.net job: 959071

RA center: 11h 58' 22"

DEC center: +53° 4' 55"

Pixel scale: 3.415 arcsec/pixel

Orientation: -91.867 degrees

Field radius: 0.886 degrees


Resolution: 620x460

Locations: My Backyard, Clovis, California, United States

Description

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.

Comments

Sky plot

Sky plot

Histogram

Galaxy M109 & Friends (LRGB), 



    
        

            Scott Davis