Sketch ready:
Final drawing:

NGC 4236

NGC 4236

Drawing data

NGC 4236 Dra GX
Date(s) of observation:
2013.05.09/10. Ágasvár
2013.05.10/11. Ágasvár
2015.06.06/07. Kerepes
2017.05.27/28. Ágasvár
Place(s) of observation:
Ágasvár, Kerepes
Telescope(s) used:
100/400T (Dobson)
Enlargement(s) used:
50x (8mm Planetary)
Field size:
Author / Observer:
Peter Kiss


NGC 4236 drawing inverted into positive.
NGC 4236 drawing inverted into positive.

I was surprised when I spotted this large and unknown (to me that time) galaxy in the Sky Atlas. Furthermore it is pretty bright based on the catalog data, about 10.1m. That time I didn't know that this size and integrated brightness are not the best combination when it comes to surface brightness. This barred spiral galaxy is about 11-12 million light years away from us. This means it is very close. It is a member of the M 81 Group.

The galaxy does not reveal many details in the small 4" Dobsonian telescope. The whole galaxy is an extremely diffuse, mysterious glow basically without details. The central area is elongated with a fainter asymetrical extension to one side. The central part is eventually the bar of the galaxy and the extension is the brighter part of the spiral structure. You can see a lot more details with a larger telescope and this made me a bit gloomy while drawing. Because all these details remained hidden in the small scope.

It took me a long time to draw this galaxy. Partly because of the former reason. And partly because of the unpredictable spring weather and the great number of other much more tempting projects. A funny addition is that after the 2013 May weekend (by "after" I mean quite a few days) I had to think for hours to find out what this object is that I had just started to draw. There were only a good dozen stars in the field and nothing more in my sketchbook. And I forgot to indicate the name of the object in the sidenotes...

Comparison with the photograph

NGC 4236 drawing inverted into positive.
NGC 4236. Drawing made using a 4" Newtonian telescope. Peter Kiss
DSS photo of NGC 4236.
DSS photo of NGC 4236. Copyright, credit: Space Telescope Science Institute (California Institute of Technology, National Science Foundation, the National Geographic Society, the Sloan Foundation, the Samuel Oschin Foundation, Eastman Kodak Corporation). Forrás: The STScI Digitized Sky Survey

You can see the Digitized Sky Survey (DSS) image on the left. More precisely the POSS II (blue) image. I rotated and cropped the image and I also made a bit of contrast enhancement. It is obvious that there is a lot to see in the galaxy. The view with a larger telescope (16" for example) is much closer to the photograph than the view wth my small 4" scope.

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