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NGC 4236 in Draco



Scope: Celestron 9.25 Edge HD 235 mm at f/7, Location: DAA Observatory, Shelter Valley, CA, 15 and 24 April 2020,  Camera: ST8300M (Baader LRGB filters)

Exposure: Exposure: 32 x 10 min  (2x2 bin) exposure with UV/IR block filter,  10 x 4 min (2x2 bin) each RGB exposures.

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Subframe calibration - Pixinsight. Subframe integration (Median combine -  Winsorized Sigma Clipping) - PixInsight.  Non-linear stretching and normalization  - PixInsight.  Curves, Levels, RGB combine, Luminance layering - PixInsight.  Final finishing  - Photoshop.  RGB calibration - eXcalibrator. Annotation - PixInsight, Aladin (Simbad and NED), and PhotoShop. This image is a  RGB combine with Luminance layering.  Images processed at resolution 3352x2532. Final Image (full size) is approximately  3000x2250.

North is up in this image.  NGC 4236 is a cool blue galaxy in the constellation of Draco. It visually the largest galaxy in Draco and doesn't seem to get much attention by astro imagers. This field seems to be lightly studied - there are numerous visually apparent background galaxies that are only catalogued in UV and IR surveys (as UV and IR sources).  NGC 4236 is a barred spiral with a classification of SB(s)dm. It is also known as  UGC 7306, PGC 39346, and MGC+12-12-004. NGC 4236 is about 9 million light years distant. The full size image has an image scale of 0.76 arcsec/pixel.  Some of the brighter stars  and background galaxies are identified in the annotated image. This image replaces an earlier image that can be seen in the Archives here. Horizontal FOV is approximately 38 arc minutes. 

Image center is approximately - Equatorial 2000: RA: 12h 16m 42s Dec: +6928'00"


All images and content remain the property of Jim Thommes - copyright 2003 - 2020

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