Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  M 101  ·  M101  ·  NGC 5422  ·  NGC 5457  ·  NGC 5473  ·  NGC 5474  ·  NGC 5485  ·  NGC5422  ·  NGC5447  ·  NGC5449  ·  NGC5450  ·  NGC5451  ·  NGC5453  ·  NGC5455  ·  NGC5461  ·  NGC5462  ·  NGC5471  ·  NGC5473  ·  NGC5474  ·  NGC5477  ·  NGC5484  ·  NGC5485  ·  NGC5486  ·  Pinwheel galaxy
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M101 : The Pinwheel Galaxy - Galaxie du Moulinet (NGC 5457), 


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M101 : The Pinwheel Galaxy - Galaxie du Moulinet (NGC 5457)

Imaging telescopes or lenses: TS-Optics TSQ-71ED

Imaging cameras: ZWO ASI 183 MM PRO

Mounts: iOptron CEM70

Guiding telescopes or lenses: ZWO 30F4 Miniscope

Guiding cameras: ZWO ASI 120 MM Mini

Software: Pleiades Astrophoto S.L. PixInshight 1.8  ·  Adobe Photoshop CC 2020

Filters: Astronomik Deep Sky R 1.25"  ·  Astronomik Deep Sky G 1.25"  ·  Astronomik Deep Sky B 1.25"  ·  Astronomik UV-IR Block L3 1.25’’  ·  Astronomik Halpha 6nm 1.25"

Accessory: ZWO EAF  ·  ZWO ASIAIR PRO  ·  ZWO Filter Wheel 8x1,25"

Dates:Feb. 26, 2021

Astronomik Deep Sky B 1.25": 38x60" (gain: 120.00) -15C bin 1x1
Astronomik Deep Sky G 1.25": 32x60" (gain: 120.00) -15C bin 2x2
Astronomik Deep Sky R 1.25": 38x60" (gain: 120.00) -15C bin 2x2
Astronomik Halpha 6nm 1.25": 38x60" (gain: 120.00) -15C bin 2x2
Astronomik UV-IR Block L3 1.25’’: 93x60" (gain: 120.00) -15C bin 1x1

Integration: 4.0 hours

Avg. Moon age: 13.85 days

Avg. Moon phase: 99.05%

Bortle Dark-Sky Scale: 8.00

Temperature: 4.00

Astrometry.net job: 4296794

RA center: 14h 3' 2"

DEC center: +54° 29' 28"

Pixel scale: 1.402 arcsec/pixel

Orientation: 84.926 degrees

Field radius: 1.358 degrees

Resolution: 5586x4173

Locations: Fontenay backyard, Fontenay sous Bois, Val de Marne, France

Data source: Backyard


The long season of clouds seems to be behind us in Paris (at least for a few nights :-) )

From my limited field of view on the skydome, I have no choice but to continue shooting galaxies !
This time I have shot M101 - Pinwheel galaxy.

Not the best picture due to bad use of my filter wheel, but I have learned from my errors (triggering a focus routine after a change of filter is important...).

But having shot a bit of H alpha to get the emissions from the nebulas within M101, I have used that to reduce my stars... again.

And I love my CEM70. Works well, though I only guide through a 120mm guidescope. Not enough to get very accurate guiding. I have to think about that.

Random info : I have used bin 1 for blue filter by mistake...