Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  M 101  ·  NGC 5457  ·  NGC 5477
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M101 - The Pinwheel Galaxy, 



    
        

            David Schlaudt
M101 - The Pinwheel Galaxy
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M101 - The Pinwheel Galaxy

Getting plate-solving status, please wait...
M101 - The Pinwheel Galaxy, 



    
        

            David Schlaudt
M101 - The Pinwheel Galaxy
Powered byPixInsight

M101 - The Pinwheel Galaxy

Technical card

Imaging telescopes or lenses: Celestron Nexstar 6SE

Imaging cameras: ZWO ASI 1600MM Cooled Pro

Mounts: Skywatcher AZ-EQ6 GT AZ EQ6- GT

Guiding telescopes or lenses: Orion Mini 50mm Guide Scope

Guiding cameras: ZWO ASI 120MM

Focal reducers: Celestron f6.3 Reducer/Corrector

Software: DeepSky Stacker Deep Sky Stacker 3.3.4  ·  PHD 2 Guiding PHD 2.5  ·  Sequence Generator Pro Sequence Generator

Filters: ZWO B 1.25" optimized for ASI1600  ·  ZWO G 1.25" optimized for ASI1600  ·  ZWO Hɑ 7nm 1.25"  ·  ZWO L 1.25" optimized for ASI1600  ·  ZWO R 1.25" optimized for ASI1600


Dates:April 26, 2019

Frames:
ZWO B 1.25" optimized for ASI1600: 65x180" (gain: 300.00) -20C bin 1x1
ZWO G 1.25" optimized for ASI1600: 65x180" (gain: 300.00) -20C bin 1x1
ZWO Hɑ 7nm 1.25": 20x180" (gain: 300.00) -20C bin 1x1
ZWO L 1.25" optimized for ASI1600: 65x180" (gain: 300.00) -20C bin 1x1
ZWO R 1.25" optimized for ASI1600: 65x180" (gain: 300.00) -20C bin 1x1

Integration: 14.0 hours

Darks: ~10

Flats: ~20

Avg. Moon age: 21.75 days

Avg. Moon phase: 54.18%

Bortle Dark-Sky Scale: 4.00


Basic astrometry details

Astrometry.net job: 2673107

RA center: 14h 3' 12"

DEC center: +54° 20' 45"

Pixel scale: 0.344 arcsec/pixel

Orientation: 76.768 degrees

Field radius: 0.511 degrees


Resolution: 8350x6680

Locations: Home, Rockford, Michigan, United States

Data source: Backyard

Description

M101, aka the Pinwheel Galaxy, was my project for the month of April. The resulting image is a combination of data captured over the course of 5 different nights in the past month and is to date the longest total integration time I’ve captured for any single object.

Galaxies are probably my favorite objects to image, it will never cease to amaze me the scale of what I’m looking at when I first see the object show up on the screen. M101 is a large spiral galaxy with an approximate diameter of 170,000 light-years. At 25 million light years away it is actually relatively close compared to many other large galaxies. One of the things that makes M101 unique to observe is that it is a “face-on” spiral galaxy, meaning from our vantage point we’re looking at the “top” of the galaxy. This allows us to see in awesome detail the structure of the spiral arms which give the object its name, the Pinwheel Galaxy. As with most galaxies M101 is best imaged using broadband filters (LRGB), however, as I’ve done with other galaxies recently, I’ve integrated some Ha narrowband data into the image to highlight the many star forming nebulas located along the galaxies spiral arms.

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M101 - The Pinwheel Galaxy, 



    
        

            David Schlaudt