Bode's Galaxy (M81) ( KuriousGeorge )

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Bode's Galaxy (M81)

Imaging Telescopes Or Lenses: Planewave CDK24
Imaging Cameras: FLI PL16803
Mounts: Planewave L600
Filters: Astrodon 50 mm 5 nm Ha · Astrodon 50mm B · Astrodon 50mm R · Astrodon 50mm L · Astrodon 50 mm G
Accessories: FLI CFW-5-7 · Planewave EFA · Hedrick Focuser · Planewave Delta-T
Software: Adobe Photoshop · Diffraction Limited MaxIm DL · Planewave PWI4 · PixInsight 1.8 · Sequence Generator Pro · Photoshop CS3 · Planewave PWI3
Guiding Cameras: Starlight Xpress Ultrastar M

Dates:: Feb. 5, 2021 · Feb. 6, 2021
Frames:: Astrodon 50 mm 5 nm Ha: 10×900″(2h 30′) -20°C bin 1×1
Astrodon 50 mm G: 18×300″(1h 30′) -20°C bin 1×1
Astrodon 50mm B: 18×300″(1h 30′) -20°C bin 1×1
Astrodon 50mm L: 72×300″(6h) -20°C bin 1×1
Astrodon 50mm R: 18×300″(1h 30′) -20°C bin 1×1
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

RA center: 09h55m33s.185

DEC center: +69°04′11″.25

Pixel scale: 0.468 arcsec/pixel

Orientation: -179.671 degrees

Field radius: 0.368 degrees

More info:Open

Resolution: 3996x4002

File size: 2.2 MB

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."

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Description: Lowered blue background noise.

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Status	Advanced success
Started	...
Astrometry.net job	4208997
PixInsight job	2Y4APEBCYYWW8R7CQUYT51M8L6E25Z3E
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	09h55m33s.185
RA (top/left)	09h52m39s.752
RA (top/right)	09h58m24s.216
RA (bottom/right)	09h58m30s.575
RA (bottom/left)	09h52m37s.617

Dec (center)	+69°04′11″.25
Dec (top/left)	+68°48′34″.99
Dec (top/right)	+68°48′22″.34
Dec (bottom/right)	+69°19′37″.23
Dec (bottom/left)	+69°19′47″.50

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Bode's Galaxy (M81)

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Bode's Galaxy (M81)

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