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Contains:  NGC 5477, NGC 5473, M 101, NGC 5457
Getting plate-solving status, please wait...
M101- Pinwheel Galaxy, 


M101- Pinwheel Galaxy

M101- Pinwheel Galaxy

Technical card

Resolution: 7842x6268

Dates:April 16, 2019April 22, 2019May 5, 2019May 6, 2019

Astronomik B 31 mm Type IIc: 17x300" (gain: 139.00) -20C
Astronomik G 31 mm Type IIc: 17x300" (gain: 139.00) -20C
Astrodon Ha 31mm 5nm: 39x300" (gain: 139.00) -20C
Astronomik L 31mm Type IIc: 88x300" (gain: 139.00) -20C
Astronomik R 31 mm Type IIc: 17x300" (gain: 139.00) -20C

Integration: 14.8 hours

Darks: ~30

Flats: ~30

Avg. Moon age: 7.87 days

Avg. Moon phase: 44.97%

Bortle Dark-Sky Scale: 4.33 job: 2697277

RA center: 210.803 degrees

DEC center: 54.350 degrees

Pixel scale: 0.650 arcsec/pixel

Orientation: 359.875 degrees

Field radius: 0.906 degrees

Locations: Deerlick Astronomy Village, Sharon, GA, United States

Data source: Backyard


This marks 2 years of astrophotography for me. I've made a comparison with my attempts at M101 from previous years, more details can be found here:

**[PixInsight Processing](**

* BatchPreprocessing

* SubframeSelector

* StarAlignment

* Blink

* Local Normalization

* ImageIntegration

* DrizzleIntegration (2x, VarK=1.5)

* DynamicCrop

* DynamicBackgroundExtraction 2x

* **Luminance:**

* PSFImage/ADVStarMask/RangeSelection/CloneStamp

* Deconvolution

* TVG/MMT Noise Reduction (Per [Jon Rista's Tutorial](

* ArcsinhStretch


* **RGB:**

* LinearFit to Green

* ChannelCombination

* NBRGBCombination (to combine Ha data with RGB)

* PhotometricColorCalibration


* HSV Repair

* ArcsinhStretch

* HistogramTransformation

* LRGBCombination with Luminance

* HistogramTransformation

* [Curve](

* LocalHistogramEqualization


* More Curves and LHE Adjustments

* MorphologicalTransformation to reduce star sizes

* Even *more* Curves and LHE

* ColorSaturation

* Annotation



License: None (All rights reserved)

Sky plot

Sky plot


M101- Pinwheel Galaxy,