M81 - Bode's Galaxy (Steve Ludwig)

M81 - Bode's Galaxy

Equipment

- Main scope: Bresser Messier 10" Newton (254/1270)
- Main camera: Nikon D3300 (unmodified)
- Guide scope: Orion AC 50/162 Deluxe Mini
- Guide camera: ZWO ASI 290MC
- Mount: Skywatcher EQ6-R
- Explore Scientific HR coma corrector

Acquisition

- 96 lights x 300 s = 8 h
- no dark, flat, bias frames
- no filters
- ISO 200
- Bortle 4

Processing (latest revision)

- stacked in DSS
- bilinear debayer method & median kappa sigma clipping

- unmodified TIF opened in PixInsight
- STF stretch
- dynamic crop
- dynamic background extraction
- background neutralization
- color calibration
- histogram transformation
- SCNR green to remove greenish noise
- use of starnet 2 to separate background and stars
- background: creation of different lightness masks to separate the galaxy from the dark background
- background: masked curves transformation to increase color saturation of bright galaxy regions
- background: masked deconvolution to improve detail in the brightest parts of the galaxy
- background: masked ACDNR to reduce noise of the background and the outer galaxy regions
- stars: curves transformation to increase color saturation
- stars: multiscale linear transform to increase sharpness
- pixel math to recombine background and stars
- resample 50% to improve general noise (not much detail loss as the image was oversampled anyway)
- final histogram / curves transformations
- saved as jpg

Original
Final
B

B

Description: For this revision I added the following steps:

- deconvolution step for the brightest part of the galaxy to increase sharpness
- multiscale linear transform applied to the stars to increase sharpness
- final curves transformation to increase overall color saturation a bit

Uploaded: ...

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Deep sky
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	Image of the day	Top pick	Top pick nominations	Total submitted
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Status	Advanced success
Started	...
Astrometry.net job	5613350
PixInsight job	5S9XX5LK6JS2JLAMSURM6ET54XCXWIJ2
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	09h55m35s.90
RA (top/left)	10h01m01s.90
RA (top/right)	09h53m33s.65
RA (bottom/right)	09h50m09s.32
RA (bottom/left)	09h57m33s.16

Dec (center)	+69°04′12″.7
Dec (top/left)	+69°03′30″.9
Dec (top/right)	+69°31′17″.1
Dec (bottom/right)	+69°04′16″.2
Dec (bottom/left)	+68°37′03″.6

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M81 - Bode's Galaxy

M81 - Bode's Galaxy

Equipment

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Image Index:

Contribution Index (beta):

M81 - Bode's Galaxy

M81 - Bode's Galaxy

Equipment

Acquisition details

Description

Comments

Revisions

B

Sky plot

Histogram

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