Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  Bode's Galaxy  ·  Bode's galaxy  ·  M 81  ·  M81  ·  NGC 3031
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Bode's Galaxy (M81), 


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Bode's Galaxy (M81)

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Bode's Galaxy (M81), 


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Bode's Galaxy (M81)

Imaging telescopes or lenses: Planewave CDK24

Imaging cameras: FLI Proline 16803

Mounts: Planewave L600

Guiding cameras: Starlight Xpress Ultrastar

Software: Planewave PWI3  ·  Planewave PWI4  ·  PixInsight 1.8  ·  Sequence Generator Pro  ·  Photoshop CS3  ·  Maxim DL6  ·  Adobe Photoshop CC 2014

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  ·  Hedrick Focuser  ·  Planewave Delta-T  ·  Planewave EFA

Dates:Feb. 5, 2021Feb. 6, 2021

Astrodon 50 mm 5 nm Ha: 10x900" (2h 30') -20C bin 1x1
Astrodon 50 mm G: 18x300" (1h 30') -20C bin 1x1
Astrodon 50mm B: 18x300" (1h 30') -20C bin 1x1
Astrodon 50mm L: 72x300" (6h) -20C bin 1x1
Astrodon 50mm R: 18x300" (1h 30') -20C bin 1x1

Integration: 13h

Darks: ~40

Flats: ~100

Flat darks: ~100

Bias: ~20

Avg. Moon age: 23.49 days

Avg. Moon phase: 36.00%

Mean SQM: 21.30

Mean FWHM: 2.00

Astrometry.net job: 4208997

RA center: 9h 55' 33"

DEC center: +69° 4' 11"

Pixel scale: 0.468 arcsec/pixel

Orientation: -179.671 degrees

Field radius: 0.368 degrees

Resolution: 3996x4002

Locations: KG Observatory, Julian, CA, United States

Data source: Backyard


February weather isn't looking so clear. Fortunately they forecasted a clearing Friday and Saturday night which actually happened. (-:

Given I had only 2 days, maybe less, I decided to go for M81. It was high in the sky from 7 PM to 5 AM, thus giving lots of capture time.

Skies started out very steady Friday night for about an hour of Luminance (2.2" FWHM) followed by an hour of each R, G and B (3" FWHM). Then the wind picked up at 2 AM and the night was over.

Saturday was great all night. 21.3 SQM, perfectly clear, and 5 minutes subs down to 1.7" FWHM. I captured 6 hours of L, more RGB and even 2.5 hours of Ha. This replaced some of the less steady L and RGB from Friday.

I would have liked to capture more steady RGB for better star color. Luckily there's not a lot of really bright stars, so the 3" RGB data is not that noticeable. (-:

"Messier 81 (also known as NGC 3031 or Bode's Galaxy) is a grand design spiral galaxy about 12 million light-years away, with a diameter of 90,000 light years, in the constellation Ursa Major.

It is estimated that M81 contain over 200 globular clusters.

Only one supernova has been detected in Messier 81. The supernova, named SN 1993J, was discovered on 28 March 1993 by F. García in Spain. At the time, it was the second brightest supernova observed in the 20th century."



    Bode's Galaxy (M81), 


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    Bode's Galaxy (M81), 




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Bode's Galaxy (M81),