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Contains:  IC2745, Leo Triplet, M 65, M 66, M65, M66, NGC 3623, NGC 3627, NGC 3628, NGC3628
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Leo Triplet, 



    
        

            Linda
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Technical card


Dates:April 16, 2020May 12, 2020May 18, 2020May 25, 2020June 7, 2020June 8, 2020June 12, 2020June 14, 2020

Frames:
Astrodon Gen 2 Series I Blue: 93x60" (gain: 25.00) -15C bin 1x1
Astrodon Gen 2 Series I Green: 511x60" (gain: 25.00) -15C bin 1x1
Astrodon Gen 2 Series I Red: 72x60" (gain: 25.00) -15C bin 1x1

Integration: 11.3 hours

Darks: ~50

Flats: ~53

Flat darks: ~50

Avg. Moon age: 18.87 days

Avg. Moon phase: 51.51%

Bortle Dark-Sky Scale: 7.00


Astrometry.net job: 3618643

RA center: 11h 19' 49"

DEC center: +13° 16' 56"

Pixel scale: 1.623 arcsec/pixel

Orientation: 179.942 degrees

Field radius: 0.714 degrees


Resolution: 2214x2268

Locations: Home, Broadlands, VA, United States

Data source: Backyard

Description

I started this project in April 2020 and was forced to end it in mid-June. The spring has been very cloudy and rainy and clear nights have been few. My goal was to get 8 hours per filter and in my naive belief that I had plenty of time, I concentrated on one filter at a time. Now, the Triplet is going behind a tree less than half an hour after true darkness and I'm not likely to get enough additional data to really make a difference. As a result I ended up with my goal of 8 hours only in green. But, in an effort to get in at least some of the remaining channels, I have only 70 and 90 minutes each of red and blue.

As a result, I wasn't sure whether I'd be able to cope with the noise appropriately but mure denoise is a marvelous tool! This is a very basic processing.

For each red, green and blue master:
Dynamic Crop
Mure Denoise
Dynamic Background Extraction

For the RGB:
Channel Combination
Photometric Color Calibration
Histogram Transformation
Curves Transformation (saturation)

And that's it. Mure Denoise left the backgrounds looking horrendous which limited the amount of stretching I could do and I didn't feel compelled or capable of doing anything more sophisiticated. Overall, I was pretty happy with the compromise result.

Comments

Author

ac4lt
Linda
License: Attribution-NonCommercial-ShareAlike Creative Commons
1371
Like

Revisions

  • Leo Triplet, 



    
        

            Linda
    Original
  • Leo Triplet, 



    
        

            Linda
    B
  • Leo Triplet, 



    
        

            Linda
    C
  • Final
    Leo Triplet, 



    
        

            Linda
    D

B

Description: Did a small amount of star shrinkage.

C

Description: Brought the levels up on ngc 3628 a bit and ran sharpening.

D

Description: ran scnr

Sky plot

Sky plot

Histogram

Leo Triplet, 



    
        

            Linda