Contains: NGC 5195, Whirlpool galaxy, M 51, NGC 5194
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Technical card

Imaging telescope or lens: Planewave CDK14

Imaging camera: SBIG STT 8300M

Mount: Paramount ME II

Guiding camera: SBIG STT 8300M

Filter: Astrodon 36mm 5,3,3 and LRGB

Resolution: 2918x2031

Dates: May 9, 2017

Frames: 110x900"

Integration: 27.5 hours

Avg. Moon age: 13.50 days

Avg. Moon phase: 98.19% job: 1574928

RA center: 202.458 degrees

DEC center: 47.192 degrees

Pixel scale: 0.437 arcsec/pixel

Orientation: -87.341 degrees

Field radius: 0.216 degrees

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


I struggled to get both the fainter details to show without noise while at the same time getting the brighter parts to retain detail and sharpening. So I ended up using a subset of the sharpest Luminance and color subs to create a sharp Synthetic Luminance. I processed that in CCDStack with all of the color data I had which was bin 1x1. This "sharp" version was sharpened in CCDStack an had a limited stretch. Then I restacked all of the data, fuzzy subs and all, and stretched this more aggressively.

Moving to Photoshop, the more stretched version received a Topaz Denoise and then the brighter parts of the sharp version were layered on the fuzzy one. I then flattened and processed as normal. I should add that when selecting the bright regions from the Sharp version, removed any stars with ringing artifacts from the sharpening process.

Total dataset: 34 Luminance, 18 Red, 29 Green, 16 Blue, and 12 Ha. All 15 minute subs.



Kevin Morefield

Sky plot

Sky plot




        Kevin Morefield