NGC 4236 in Draco
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CLICK ON IMAGE FOR FULL SIZE VIEW (3000x2250) 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: +69°28'00"
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