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Hemisphere:  Northern  ·  Contains:  Bode's nebulae, M 81, M 82, NGC 3031, NGC 3034
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M81 & M82, Bode's and Cigar Galaxies, 


            Ross Walker
M81 & M82, Bode's and Cigar Galaxies
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M81 & M82, Bode's and Cigar Galaxies

Technical card

Imaging telescopes or lenses: TS OPTICS Photoline 130 F/7 Triplet APO

Imaging cameras: ZWO ASI 1600MM-Pro (Mono)

Mounts: Sky-Watcher EQ8

Guiding telescopes or lenses: TS OPTICS Photoline 130 F/7 Triplet APO

Guiding cameras: ZWO ASI120MM-Mini

Focal reducers: TS Optics PHOTOLINE 3" 0.79x Reducer/Flattener

Software: Pleiades PixInsight  ·  Sequence Generator Pro

Filters: Chroma Green (36mm)  ·  Chroma Ha (3nm)  ·  Chroma Luminance (36mm)  ·  Chroma Blue (36mm)  ·  Chroma Red (36mm)

Dates:March 14, 2019

Chroma Blue (36mm): 91x120" (gain: 139.00) -25C bin 1x1
Chroma Green (36mm): 79x120" (gain: 139.00) -25C bin 1x1
Chroma Ha (3nm): 111x240" (gain: 139.00) -25C bin 1x1
Chroma Luminance (36mm): 216x120" (gain: 139.00) -25C bin 1x1
Chroma Luminance (36mm): 5x240" (gain: 139.00) -25C bin 1x1
Chroma Luminance (36mm): 100x30" (gain: 139.00) -25C bin 1x1
Chroma Luminance (36mm): 148x60" (gain: 139.00) -25C bin 1x1
Chroma Red (36mm): 83x120" (gain: 139.00) -25C bin 1x1

Integration: 26.7 hours

Darks: ~20

Flats: ~20

Flat darks: ~20

Avg. Moon age: 7.45 days

Avg. Moon phase: 50.74%

Bortle Dark-Sky Scale: 5.00

Mean SQM: 20.00

Basic astrometry details job: 3263685

RA center: 9h 55' 39"

DEC center: +69° 20' 16"

Pixel scale: 1.064 arcsec/pixel

Orientation: 265.260 degrees

Field radius: 0.600 degrees

Resolution: 3513x2033

Locations: Home observatory, Otsu, Shiga, Japan

Data source: Backyard



My fourth processing attempt and my first broadband and narrowband combo. Somehow I managed to resurrect a near disaster, caused by more than a few strong gradients due to my LRGB calibration files not being able to calibrate the subs correctly. I had to trim the image as a result.

I added my Ha data to the Red channel using a variation of the Vicent Peris expression as explained here. It worked surprisingly well.

An application of deconvolution would not go astray to shrink those bloated stars a little; that's another technique I need to learn.

From wiki:

Messier 81 (also known as NGC 3031 or Bode's Galaxy) is a spiral galaxy about 12 million light-years away, with a diameter of 90,000 light years, about half the size of the Milky Way, in the constellation Ursa Major. Due to its proximity to Earth, large size, and active galactic nucleus (which harbors a 70 million M☉ supermassive black hole), Messier 81 has been studied extensively by professional astronomers. The galaxy's large size and relatively high brightness also makes it a popular target for amateur astronomers.

Messier 82 (also known as NGC 3034, Cigar Galaxy or M82) is a starburst galaxy approximately 12 million light-years away in the constellation Ursa Major. A member of the M81 Group, it is about five times more luminous than the whole Milky Way and has a center one hundred times more luminous than our galaxy's center. The starburst activity is thought to have been triggered by interaction with neighboring galaxy M81. As the closest starburst galaxy to Earth, M82 is the prototypical example of this galaxy type. SN 2014J, a type Ia supernova, was discovered in the galaxy on 21 January 2014. In 2014, in studying M82, scientists discovered the brightest pulsar yet known, designated M82 X-2.



Ross Walker
License: None (All rights reserved)

Sky plot

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M81 & M82, Bode's and Cigar Galaxies, 


            Ross Walker