Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  Bode's Galaxy  ·  M 81  ·  NGC 3031
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Messier 81 - Bodes Nebula - RGB+Ha+OIII (OSC), 



    
        

            Randy Roy
Messier 81 - Bodes Nebula - RGB+Ha+OIII (OSC)
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Messier 81 - Bodes Nebula - RGB+Ha+OIII (OSC)

Getting plate-solving status, please wait...
Messier 81 - Bodes Nebula - RGB+Ha+OIII (OSC), 



    
        

            Randy Roy
Messier 81 - Bodes Nebula - RGB+Ha+OIII (OSC)
Powered byPixInsight

Messier 81 - Bodes Nebula - RGB+Ha+OIII (OSC)

Technical card

Imaging telescopes or lenses: GSO Ritchey-Chrétien 6" f/9

Imaging cameras: ZWO ASI533MC Pro

Mounts: Skywatcher EQ6R Pro

Guiding telescopes or lenses: QHYCCD Mini 30 mm Guide Scope

Guiding cameras: QHYCCD 5-III 178C

Focal reducers: GSO 0.75 RC

Software: APT Astro Photograhy Tool  ·  StarTools 1.6.400 MR1  ·  Astro Pixel Processor  ·  PHD2 Guiding Open Guiding

Filters: Optolong L-eXtreme 1.25"


Dates:March 4, 2021

Frames:
ZWO IR CUT: 182x60" (3h 2') (gain: 100.00) -5C
Optolong L-eXtreme 1.25": 20x240" (1h 20') (gain: 100.00) -5C

Integration: 4h 22'

Darks: ~50

Flats: ~22

Bias: ~50

Avg. Moon age: 20.45 days

Avg. Moon phase: 67.63%

Bortle Dark-Sky Scale: 5.00


Basic astrometry details

Astrometry.net job: 4279610

RA center: 9h 55' 36"

DEC center: +69° 3' 36"

Pixel scale: 1.043 arcsec/pixel

Orientation: 359.334 degrees

Field radius: 0.389 degrees


Resolution: 1934x1860

Data source: Backyard

Description

The largest galaxy of the M81 group. I am experimenting with different methods of combining narrowband data from my Optolong L-eXtreme filter with OSC color data. For this, I simply integrated 182 color frames with 20 Ha-OIII frames from the L-eXtreme. This resulted in only a subtle addition of narrowband with the OSC color data to manage the noisier NB frames.

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Messier 81 - Bodes Nebula - RGB+Ha+OIII (OSC), 



    
        

            Randy Roy