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NGC 4236 in Draco

 

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Scope: C8 f/6.4; Location: Blair Valley, Anza Borrego, CA;  27 March 2009; Camera: Artemis285

Exposure: 12 x 8 min Luminance exposure (bin 2x2) with IR/UV Block Filter; 8 x 3 min RGB (bin 3x3)

Processing: Images were captured Artemis Capture (as FITs). Aligned/stacked and dark subtracted in Astroart with Sigma Combine and average combine. Luminance and Color channels were scaled and rough color balanced in Astroart. All combined stacks were up-sampled to 1392x1040 (1x1 bin resolution). Central Gradient was removed on all channels in Astroart. Channels were co-registered in Astroart. The 8 minute IR block exposures were used for the main luminance construction with level adjustments and curves to bring out object features.   LRGB combine was done in Photoshop. G2V  factors applied to color channels.  Background noise reduction was applied in PixInsight LE (SGBNR).  Selective sharpening was applied to galaxy features. Final Image size is approximately 1392x1040.

This image was guided; North is to the Right.  This galaxy, NGC4236 is an irregular barred spiral galaxy located in the constellation of  Draco. Ii is a somewhat visually large galaxy spanning about 22 arc minutes. NGC 4236 is considered part of the M81 galaxy group. Its distant from Earth is estimated at about 11.7 million light years.  Horizontal FOV is 23'.

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 - 2012

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