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NGC 2903 Leo, (Ha+R)GB, OB Associations and Mama-Clouds

astrophotography ccd CMOS dslr dso imaging Orion refractor
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#1 rekokich

rekokich

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Posted 29 May 2020 - 09:15 AM

NGC 2903 Leo, (Ha+R)GB, OB Associations and Mama-Clouds

 

In this version of the image I extracted RGB channels from the original OSC photograph, added a very grainy Ha stack to the R channel, processed it separately, then recombined (Ha+R)GB. I am not sure the result has much aesthetic appeal, but it is interesting to see how the light blue OB associations in the spiral arms are immersed in fluorescing Mama-hydrogen clouds.

 

The original OSC post is here:
https://www.cloudyni...y-ugc-5086-leo/

 

Image details
-TSAPO100Q astrograph, Sigma APO 1.4x tele-extender (100 x 812 mm)
-iEQ30pro mount, Orion 60mm f/4 SSAGpro autoguider
-Canon T3i modified camera, Astronomik L3 filter for OSC
-(24 x 300 sec OSC subs, ISO 1600) + (6 x 360 sec Ha subs, ISO 3200)
-30 dark and 30 bias frames, 2x drizzle, 25% crop
-Software: PHD2, DSS, reprocessed with XnView and StarTools

 

Thank you for looking.

 

z3.jpg

 

NGC 2903 animation.gif


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