Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  M 101  ·  NGC 5455  ·  NGC 5457  ·  NGC 5461  ·  NGC 5471
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M101 Galaxy, Scott Denning
M101 Galaxy
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M101 Galaxy

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M101 Galaxy, Scott Denning
M101 Galaxy
Powered byPixInsight

M101 Galaxy

Equipment

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Acquisition details

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Description

M101 March-April 2020 (during COVID-19 lockdown!)

RGB Ha unguided over many, many nights

Borg 125SD @f8.4 (FL=1050 mm)

ZWO ASI 1600pro @ 0.75“/pixel

L: 78x120; R: 84x180; G: 89x180; B: 90x180; Ha: 73x180

Calibrated w/ darks, flats, & flat-darks

Cosmetic corrected

Registered

Subframe selected (got rid of at least 50% for elongated & poorly-focused stars)

Weighted for SNR

Local Normalization

Integrated with ESD rejection and LNORM

Cropped (too) aggressively

Mure Denoise each channel (laborious!)

DBE

Deconvolution of each channel (took ALL DAY!)

Channel Combination

Photometric Color Calibration (to avg white galaxy)

Custom blending of Ha with RGB

Histogram Transform

HDRMT

Sharpened with Multiscale Linear Transformation

Curves to balance color

Comments

Sky plot

Sky plot

Histogram

M101 Galaxy, Scott Denning