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Barnard 143 (LRGB), 


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Barnard 143 (LRGB), 


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Acquisition details

June 21, 2023 ·  June 22, 2023 ·  June 23, 2023 ·  June 24, 2023 ·  June 25, 2023 ·  June 26, 2023 ·  June 27, 2023 ·  July 1, 2023 ·  July 2, 2023 ·  July 7, 2023 ·  July 8, 2023 ·  July 9, 2023 ·  July 10, 2023 ·  July 11, 2023 ·  July 12, 2023 ·  July 13, 2023 ·  July 14, 2023 ·  July 15, 2023 ·  July 16, 2023
Astrodon Gen2 E-Series Tru-Balance Blue 50 mm: 25×600(4h 10′) -25°C bin 2×2
Astrodon Gen2 E-Series Tru-Balance Green 50 mm: 23×600(3h 50′) -25°C bin 2×2
Astrodon Gen2 E-Series Tru-Balance Lum 50 mm: 53×900(13h 15′) -25°C bin 1×1
Astrodon Gen2 I-Series Tru-Balance Red 50 mm: 22×600(3h 40′) -25°C bin 2×2
24h 55′
Avg. Moon age:
16.13 days
Avg. Moon phase:

RA center: 19h40m45s.842

DEC center: +11°0209.46

Pixel scale: 0.727 arcsec/pixel

Orientation: 91.120 degrees (flipped)

Field radius: 0.529 degrees

WCS transformation: thin plate spline

More info:Open 

Resolution: 3687x3716

File size: 2.0 MB

Locations: Sierra Remote Observatories, Auberry, California, United States

Data source: Own remote observatory

Remote source: Sierra Remote Observatories


When we begin image acquisition for this, I thought it was going to be "just another" dark nebula. Not that this is a bad thing. I love imaging them, but it turns out there was enough data be able to pull out that faint detail and really bring the dark nebula out into the light. 

I have to give credit to @Chris Kagy who got a head start on processing this and when I saw what he did (https://www.astrobin.com/a8a2is/), I knew I was no longer going to be satisfied with the image I had in my brain prior to starting. Chris marked me as a collaborated on his image (along with the rest of our team) so I'm returning the favor but really each person processed the image independently (though perhaps with some discussion about approaches on various things).

Here's what I did:

dynamic crop
GHS (three iterations, with very careful symmetry point selections)

L stars:

rgb stars:
unsharp mask (very mild sharpening)

dynamic crop
GHS (three iterations with very careful symmetry point selection)
LRGB Combination (adding L)
Because I used the color blend mode in the GHS stretch I had a very saturated background that looked, psychedelic. I used SCNR to pull most of the blue and all of the green out 
Curves (contrast)
MLT (very mild sharpening)
pixel math in stars (screen)

It was really GHS that made this image possible. It was also incredible sensitive to where the symmetry point was set but by careful manipulation of the symmetry point it was possible to really enhance the contrast.

Thanks to the kind folks at AAPOD2 who selected this as their image for 18 July 2023: https://www.aapod2.com/blog/dkr5rbajzxfqicgvuxzqv1md1ivdqp