Hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  IC 1795  ·  IC 1805  ·  NGC 896  ·  Sh2-190
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Heart Nebula HaRGB, 



    
        

            John Willis
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Heart Nebula HaRGB

Getting plate-solving status, please wait...
Heart Nebula HaRGB, 



    
        

            John Willis
Powered byPixInsight

Heart Nebula HaRGB

Equipment

Imaging Telescopes Or Lenses
Takahashi FSQ106ED
Imaging Cameras
ZWO ASI1600MM-Cool
Mounts
iOptron CEM 60
Filters
ZWO Ha 7nm · ZWO Blue 36mm · ZWO Red 36mm · ZWO Green 36mm
Accessories
Takahashi Reducer 0.60 f/3.0
Software
Seqence Generator Pro · PixInsight
Guiding Telescopes Or Lenses
PrimaLuceLab 60mm CompactGuide scope
Guiding Cameras
QHYCCD QHY5L-II M

Acquisition details

Dates:
Oct. 4, 2019
Frames:
624x40" (6h 56')
Integration:
6h 56'
Avg. Moon age:
6.22 days
Avg. Moon phase:
37.79%

RA center: 02h32m41s.64

DEC center: +61°1641.6

Pixel scale: 2.440 arcsec/pixel

Orientation: 88.758 degrees

Field radius: 1.902 degrees

More info:Open 

Resolution: 4548x3288

Locations: Backyard, Plano, Texas, United States

Data source: Backyard

Description

For this one, I tried to combine several things to get a better HaRGB combine than I normally end up with.

First, I ran the Ha channel through Starnet++ to get a starless image, and stretched it enough to get good contrast throughout. At the same time, I focused on getting the stars to look as good as I could in the RGB image, not worrying as much about bringing out nebula detail.

Then I used the Pixinsight NBRGB combine script, setting the weight on the HA to be much higher than default (about 4-5 instead of 1.2). That let the nebula come through really strongly, without messing up the stars since it was a starless image.

The high value on the combine means it's crazy super Red in the nebula, which looks really unnatural. So I then used a colormask to select just the red, and I adjusted the Red/Green box (CIE * a component) very slightly more toward green, giving a more natural color to the nebula.

After that, standard noise reduction, stretching, curves, and other small processes to get to the final result.

Comments

Sky plot

Sky plot

Histogram

Heart Nebula HaRGB, 



    
        

            John Willis