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Contains:  NGC 4236
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NGC 4236 • Faint Barred Spiral Galaxy, 


            Douglas J Struble
NGC 4236 • Faint Barred Spiral Galaxy
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NGC 4236 • Faint Barred Spiral Galaxy

Technical card

Dates:April 22, 2020May 6, 2020May 14, 2020May 24, 2020May 25, 2020

Astrodon Blue Tru-Balance E-Series Gen 2: 324x60" (gain: 0.00) -20C bin 1x1
Astrodon Green Tru-Balance E-Series Gen 2: 324x60" (gain: 0.00) -20C bin 1x1
Astrodon Ha 5nm: 252x120" (gain: 200.00) -20C bin 1x1
Astrodon Red Tru-Balance E-Series Gen 2: 356x60" (gain: 0.00) -20C bin 1x1
Astronomik Luminance (UV/IR Cut) L-1: 1106x60" (gain: 0.00) -20C bin 1x1

Integration: 43.6 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 13.80 days

Avg. Moon phase: 32.13%

Bortle Dark-Sky Scale: 8.00

Basic astrometry details job: 3559412

RA center: 12h 16' 49"

DEC center: +69° 26' 38"

Pixel scale: 1.105 arcsec/pixel

Orientation: 325.092 degrees

Field radius: 0.480 degrees

Resolution: 2481x1900

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

Data source: Backyard


This proved to be a big challenge for me in my heavily light polluted white zone.

NGC 4236 (also known as Caldwell 3) is a barred spiral galaxy located in the constellation Draco. The galaxy is a member of the M81 Group, a group of galaxies located at a distance of approximately 11.7 Mly (3.6 Mpc) from Earth. The group also contains the spiral galaxy Messier 81 and the starburst galaxy Messier 82. NGC 4236 is located away from the central part of the M81 group at a distance of 14.5 Mly (4.45 Mpc) from Earth.



Douglas J Struble
License: None (All rights reserved)

Sky plot

Sky plot


NGC 4236 • Faint Barred Spiral Galaxy, 


            Douglas J Struble