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Contains:  IC 1805
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Melotte 15, 



    
        

            Jonathan Young
Melotte 15
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Melotte 15

Technical card


Dates:Sept. 30, 2017

Frames: 85x300" bin 0x0

Integration: 7.1 hours

Avg. Moon age: 9.53 days

Avg. Moon phase: 72.05%


Basic astrometry details

Astrometry.net job: 1755911

RA center: 2h 33' 53"

DEC center: +61° 27' 0"

Pixel scale: 1.110 arcsec/pixel

Orientation: 355.536 degrees

Field radius: 0.888 degrees


Resolution: 4608x3448

Locations: Backyard, Saline, Michigan, United States

Data source: Backyard

Description

50x300 Ha
35x300 O3
ASI 1600 - gain 180, 40 offset, 40 USB speed.
Processed with DSS and Star tools
(total processing time 95 minutes on [email protected] ghz, [email protected], 512GB 960evo NVME drive). Taken backyard Saline MI (red to north and east, orange to W, yellow to south. Average 20.7 Brightness)

DSS -
30 darks (checked for same bg level)
16 flats - 30s 20000ADU
16 dark flats
KSC for all 2.5sigma, 5 iterations, no b/g calibration, remove hot pixels. Bicubic alignment.

No dithering/drizzle

Startools: Synthetic Lum
Layer-blend Ha-b/g + O3 f/g 40% blend
Crop 24,24,48,24
Wipe - gradient 80% strength, 3 pixel dark filter
Dev - 96.5%; sky b/g 5%; dark filter 16
Mask-autostar detail size 12, 90% bright threshold, 3 strength. Invert-save.
Deconvolution- 2pixels radius
Sharp- large
Contrast- comp gamma-Y, dark filter 3pix
HDR- reveal all, str 1.2, size 512pix
Mask - set full
Denoise- DWOR 8. Smooth 75, scale 90,90,90,90,50, bright detail loss 12%, color detail 0%.
Save Lum

Ha and O3 (R+B) layers
Crop
Bin50%
Wipe- gradient 3 pixel 80% str
Dev- ha 95%, O3 97.5%, sky b/g 5%, 8 pixels
Denoise - DWOR 8, smooth 75, 90,90,90,90,50, scale 3, bright detail loss 33%, color detail loss 0.
Save Ha\O3

LRGB composite
L, R, B, calc missing-Y, cap green, blue weight 1.56
Wipe gradient 80%, 3 pix
Color- CEILab, red reduce 1.1, blue reduce 1.17, cap green.
Denoise- DWOR 8, smooth 75%, 90,90,90,90,50, bright detail loss 5%, color detail loss 20%, scale 3.
Reload mask - invert.
Magic- reduce 1 pix.
Save -> Final composite

Comments

Author

TurbulentMedium
Jonathan Young
License: None (All rights reserved)
1871
Like

Revisions

  • Melotte 15, 



    
        

            Jonathan Young
    Original
  • Melotte 15, 



    
        

            Jonathan Young
    B
  • Final
    Melotte 15, 



    
        

            Jonathan Young
    C

B

Description: Reprocessed -average stack, cold pixel removal, no wipe. Less aggressive stretch.

Sky plot

Sky plot

Histogram

Melotte 15, 



    
        

            Jonathan Young