Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  M 101  ·  M101  ·  NGC 5455  ·  NGC 5457  ·  NGC 5461  ·  NGC 5471  ·  NGC5447  ·  NGC5449  ·  NGC5450  ·  NGC5451  ·  NGC5453  ·  NGC5455  ·  NGC5461  ·  NGC5462  ·  NGC5471  ·  Pinwheel galaxy
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Pinwheel Galaxy (M101) from < 1" seeing, 



    
        

            KuriousGeorge
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Pinwheel Galaxy (M101) from < 1" seeing

Imaging telescopes or lenses: Planewave CDK24

Imaging cameras: FLI Proline 16803

Mounts: Planewave L600

Guiding cameras: Starlight Xpress Ultrastar

Focal reducers: None

Software: Planewave PWI4  ·  Planewave PWI3  ·  PixInsight 1.8  ·  Sequence Generator Pro  ·  Photoshop CS3  ·  PHD Guiding 2  ·  CCDWare CCD Inspector  ·  Maxim DL6

Filters: Astrodon 50 mm 5 nm Ha  ·  Astrodon 50mm B  ·  Astrodon 50mm R  ·  Astrodon 50mm L  ·  Astrodon 50 mm G

Accessory: FLI CFW-5-7  ·  Astrodon Monster MOAG  ·  Hedrick Focuser  ·  Planewave Delta-T  ·  Planewave EFA


Dates:July 12, 2020July 21, 2020

Frames:
Astrodon 50 mm 5 nm Ha: 5x900" -30C bin 1x1
Astrodon 50 mm G: 10x900" -30C bin 1x1
Astrodon 50mm B: 12x900" -30C bin 1x1
Astrodon 50mm L: 32x900" -30C bin 1x1
Astrodon 50mm R: 10x900" -30C bin 1x1

Integration: 17.2 hours

Darks: ~20

Flats: ~100

Flat darks: ~100

Bias: ~20

Avg. Moon age: 11.27 days

Avg. Moon phase: 27.68%

Mean SQM: 21.50

Mean FWHM: 2.03


Astrometry.net job: 3690456

RA center: 14h 3' 30"

DEC center: +54° 25' 51"

Pixel scale: 0.234 arcsec/pixel

Orientation: -178.710 degrees

Field radius: 0.367 degrees


Resolution: 7957x8060

Locations: KG Observatory, Julian, CA, United States

Data source: Backyard

Description

Sorry, I'm a little late to the M101 party. (-:

I wasn't planning on shooting M101 this year. But I changed my plans while working on NGC6340 and neighbors in Draco (Deep). The seeing was just too good to pass it up.

I could only get good results from 9:15 PM to around 11:30 PM. So it took over a week to collect what you see here.

The 32 15-minute luminance subs were between 1.42" and 2.32". Average was 2.03" before deconvolution. Given seeing is usually measured as described here, we suspect this is seeing under 1".

So here's my late 2020 M101 contribution to Astrobin – with a little touch of Ha to finish it off. (-:

Comments

Sky plot

Sky plot

Histogram

Pinwheel Galaxy (M101) from < 1" seeing, 



    
        

            KuriousGeorge