Hemisphere:  Northern  ·  Constellation: Leo (Leo)  ·  Contains:  Leo Triplet  ·  M 65  ·  M 66  ·  NGC 3623  ·  NGC 3627  ·  NGC 3628
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A Trio of Galaxies, 



    
        

            Ken Sablinsky
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A Trio of Galaxies

Getting plate-solving status, please wait...
A Trio of Galaxies, 



    
        

            Ken Sablinsky
Powered byPixInsight

A Trio of Galaxies

Imaging Telescopes Or Lenses
Orion Telescopes & Binoculars - USA 12" F/8 Truss Tube Ritchey-Chretien Astrograph
Imaging Cameras
Orion StarShoot G24 Full Format Color CMOS
Mounts
Astro-Physics AP900GTO CP4
Accessories
QHYCCD OAG-M · Pegasus Astro FocusCube 2
Software
SGP · PHD2 · PixInsight
Guiding Cameras
Starlight Xpress Lodestar

Acquisition details

Dates:
Dec. 20, 2020
Frames:
86x120" (2h 52') (gain: 20.00) -10°C bin 1x1
Integration:
2h 52'
Darks:
40
Flats:
40
Flat darks:
40
Avg. Moon age:
6.01 days
Avg. Moon phase:
35.57%
Bortle Dark-Sky Scale:
7.00

RA center: 11h19m49s.749

DEC center: +13°1605.90

Pixel scale: 0.497 arcsec/pixel

Orientation: -92.821 degrees

Field radius: 0.486 degrees

More info:Open 

Resolution: 5847x3898

Locations: Backyard, Pacifica, CA, United States

Data source: Backyard

Description

The Leo Triplet, consisting of M65, M66, and NGC 3628. The 12" RC just barely fit this trio using a full format camera.

Continuing my practice with Pix, I tried a different calibration routine, foregoing bias frames in favor of dark flats. Optimizing the dark frames and using Bias frames were not reliably working to remove the background noise in some of my cameras, and I discovered online from others about CMOS chips and difficulties scaling darks for whatever reasons. The flat darks seemed to work well, and keeping "optimize dark frames" unchecked in Pix seemed to make everything match better.

I'm using a large LED tracing panel for flats, and it seems to work ok but I'm always left with some spurious gradients in the image. I'm not sure if it's the cheap LED panel, or some light pollution gradients. Anyway I worked hard at minimizing the gradient down towards the bottom right corner of the image, and got rid of most of it.

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A Trio of Galaxies, 



    
        

            Ken Sablinsky