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Contains:  IC 4263, M 51, NGC 5169, NGC 5173, NGC 5194, NGC 5195, Whirlpool galaxy
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NGC 5195 and NGC 5194 LRGB, 


            Richard H
NGC 5195 and NGC 5194 LRGB
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NGC 5195 and NGC 5194 LRGB

Technical card

Dates:Feb. 27, 2020

Frames: 228x240"

Integration: 15.2 hours

Avg. Moon age: 3.45 days

Avg. Moon phase: 12.89%

Basic astrometry details job: 3299370

RA center: 13h 29' 54"

DEC center: +47° 15' 43"

Pixel scale: 1.010 arcsec/pixel

Orientation: 35.245 degrees

Field radius: 0.796 degrees

Resolution: 4531x3418

Locations: Richard Heinsohn, Cottonwood, CA, United States

Data source: Backyard


NGC 5195 (also known as Messier 51b or M51b) is a dwarf galaxy that is interacting with the Whirlpool Galaxy (also known as M51a or NGC 5194). Both galaxies are located approximately 25 million light-years away in the constellation Canes Venatici.


Imaged over six nights (These are the final set of culled images captured)
Red 75 x 240s, Gain: 75, Offset: 21
Grn 64 x 240s, Gain: 75, Offset: 21
Blu 67 x 240s, Gain: 75, Offset: 21

Lum was created from extracting a SynthL image from the RGB for process and deconvolution then reintegrated with RGB.

Imaging and Processing Notes
During the night of February 27, 2020 I was just imaging with the Blue filter. The next morning reviewing the data I noticed nine frames where the star HIP 66004 flared up and receded back to normal. At first I thought maybe some clouds passed through but there were no clouds at the time. The second thing I noticed is that the rest of the image including the target galaxy and the remaining twenty three frames were not affected by the sharp increase of HIP 66004. The rest of the field in all frames were unaffected. So I decided to leave these frames (36 min total) in the final image. HIP 66004 appears to be a little bit fuzzy as a result and the rest of the image is in sharp focus. As a side note, seeing conditions were pretty good that evening, skies clear and was just coming out of the new moon phase so sky glow was not a factor that evening.

Ha data will be added later to enhance the galaxy.



Richard H
License: None (All rights reserved)

Sky plot

Sky plot


NGC 5195 and NGC 5194 LRGB, 


            Richard H