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Contains:  NGC 5195, Whirlpool galaxy, M 51, NGC 5194
Getting plate-solving status, please wait...
M51 Whirlpool Galaxy in HaLRGB from a Red Zone, 


            Douglas J Struble
M51 Whirlpool Galaxy in HaLRGB from a Red Zone

M51 Whirlpool Galaxy in HaLRGB from a Red Zone

Technical card

Resolution: 2936x2349

Dates:April 22, 2018May 8, 2018May 9, 2018April 23, 2019May 10, 2019May 13, 2019May 15, 2019May 20, 2019May 23, 2019

Astrnomik CLS-CCD: 1673x60" -20C bin 1x1
Astrodon Blue Tru-Balance E-Series Gen 2: 288x60" -20C bin 1x1
Astrodon Green Tru-Balance E-Series Gen 2: 273x60" -20C bin 1x1
Astrodon Ha 5nm: 118x120" (gain: 200.00) -20C bin 1x1
Astrodon Lum Tru-Balance E-Series Gen 2: 263x60" -20C bin 1x1
Astrodon Red Tru-Balance E-Series Gen 2: 240x60" -20C bin 1x1

Integration: 49.5 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 14.82 days

Avg. Moon phase: 63.35%

Bortle Dark-Sky Scale: 6.10 job: 2708975

RA center: 202.494 degrees

DEC center: 47.230 degrees

Pixel scale: 0.649 arcsec/pixel

Orientation: 117.801 degrees

Field radius: 0.339 degrees

Locations: Backyard Red Zone Observatory, Taylor, MI, Michigan, United States

Data source: Backyard


Broadband is the hardest deep space astrophotography for me here in my red zone. I piled on more integration time adding it on to last year's data, as this may be the last time I work on M51 from here.

The Whirlpool Galaxy, also known as Messier 51a, M51a, and NGC 5194, is an interacting grand-design spiral galaxy with a Seyfert 2 active galactic nucleus. It lies in the constellation Canes Venatici, and was the first galaxy to be classified as a spiral galaxy. Its distance is estimated to be between 15 and 35 million light-years.

The galaxy and its companion, NGC 5195, are easily observed by amateur astronomers, and the two galaxies may be seen with binoculars. The Whirlpool Galaxy has been extensively observed by professional astronomers, who study it to understand galaxy structure (particularly structure associated with the spiral arms) and galaxy interactions.



Douglas J Struble
License: None (All rights reserved)

Sky plot

Sky plot


M51 Whirlpool Galaxy in HaLRGB from a Red Zone, 


            Douglas J Struble