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Contains:  M 94, NGC 4736
Getting plate-solving status, please wait...
M94 Spiral Galaxy • First Light with the ES165CF, 


            Douglas J Struble
M94 Spiral Galaxy • First Light with the ES165CF
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M94 Spiral Galaxy • First Light with the ES165CF

Technical card

Dates:April 26, 2020May 12, 2020May 13, 2020May 15, 2020May 20, 2020May 24, 2020May 25, 2020May 26, 2020May 27, 2020

Astrodon Blue Tru-Balance E-Series Gen 2: 95x60" (gain: 0.00) -20C bin 1x1
Astrodon Green Tru-Balance E-Series Gen 2: 120x60" (gain: 0.00) -20C bin 1x1
Astrodon Lum Tru-Balance E-Series Gen 2: 103x60" (gain: 0.00) -20C bin 1x1
Astrodon Red Tru-Balance E-Series Gen 2: 83x60" (gain: 0.00) -20C bin 1x1
Astronomik Deep-Sky B: 45x60" (gain: 0.00) -20C bin 1x1
Astronomik Deep-Sky G: 41x60" (gain: 0.00) -20C bin 1x1
Astronomik Deep-Sky R: 57x60" (gain: 0.00) -20C bin 1x1
Astronomik Luminance (UV/IR Cut) L-1: 828x60" (gain: 0.00) -20C bin 1x1

Integration: 22.9 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 11.94 days

Avg. Moon phase: 26.14%

Bortle Dark-Sky Scale: 8.00

Basic astrometry details job: 3570733

RA center: 12h 50' 53"

DEC center: +41° 7' 8"

Pixel scale: 0.649 arcsec/pixel

Orientation: 93.761 degrees

Field radius: 0.329 degrees

Resolution: 2929x2187

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

Data source: Backyard


This is my first light with my new Explore Scientific 165 CF. I still have a few kinks to work out. I am still getting a FWHM issue producing magenta stars like I did with my ES 152 that I had to fix, but it may be my field flattener. It took me forever to finish this do to the rain we get here in Michigan with the Spring.

Messier 94 (M94), also known as Cat’s Eye Galaxy or Croc’s Eye Galaxy, is a spiral galaxy located in the constellation Canes Venatici. The Cat’s Eye Galaxy has an apparent magnitude of 8.99 and lies at a distance of 16 million light years from Earth. It has the designation NGC 4736 in the New General Catalogue. Messier 94 occupies an area of 11.2 by 9.1 arc minutes of apparent sky, which corresponds to a linear extension of 50,000 light years.



Douglas J Struble
License: None (All rights reserved)

Sky plot

Sky plot


M94 Spiral Galaxy • First Light with the ES165CF, 


            Douglas J Struble