Contains: NGC 5477, M 101, NGC 5457
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Technical card

Imaging telescope or lens: Planewave CDK14

Imaging camera: SBIG STX 16803

Mount: Paramount ME II

Guiding telescope or lens: Planewave CDK14

Guiding camera: SBIG STX 16803

Software: CCDWare CCDAutoPilot 5CCDWare CCDStack 2Adobe Photoship CCPixInsight

Resolution: 3252x3052

Dates: Feb. 17, 2018

Frames: 88x600"

Integration: 14.7 hours

Avg. Moon age: 1.52 days

Avg. Moon phase: 2.60% job: 1935804

RA center: 210.802 degrees

DEC center: 54.373 degrees

Pixel scale: 0.728 arcsec/pixel

Orientation: 56.613 degrees

Field radius: 0.451 degrees

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


The version of M101 is comprised of 88 600 seconds subs, L20, R18, G23, B27. Total of 14.6 hours.

I tested including more luminance vs less luminance using PI sub-frame selector. My quandary was whether to include 3 subs that were sharp but noisy and 4 subs with great SN ratios but less sharp than average. In the end throwing out all seven produced both a better FWHM and SN ratio so that was easy! After that I tested adding the color data for a Super Luminance and again the SN ratio and FWHM both improved. So this is using the super-luminance.

Calibration was done in CCDStack, Registration, integration, and color balance in PI, Sharpening, saturation and noise reduction in PS.



Kevin Morefield

Sky plot

Sky plot


M101 LRGB, 


        Kevin Morefield