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The M81 Group of galaxies - First light of my CEM70, 



    
        

            Jérémie

The M81 Group of galaxies - First light of my CEM70

Getting plate-solving status, please wait...
The M81 Group of galaxies - First light of my CEM70, 



    
        

            Jérémie

The M81 Group of galaxies - First light of my CEM70

Imaging telescopes or lenses: TS-Optics TSQ-71ED

Imaging cameras: ZWO ASI 183 MM PRO

Mounts: iOptron CEM70

Guiding cameras: ZWO ASI 120 MM Mini

Software: Adobe Photoshop CC 2020  ·  Pleiades Astrophoto S.L. PixInshight 1.8

Filters: Astronomik UV-IR Block L3 1.25’’  ·  Astronomik Deep Sky R 1.25"  ·  Astronomik Deep Sky G 1.25"  ·  Astronomik Deep Sky B 1.25"  ·  Astronomik Halpha 6nm 1.25"

Accessory: ZWO EAF  ·  ZWO ASIAIR PRO  ·  ZWO Filter Wheel 8x1,25"


Dates:Jan. 25, 2021

Frames:
Astronomik Deep Sky B 1.25": 40x60" (40') (gain: 120.00) -15C bin 2x2
Astronomik Deep Sky G 1.25": 40x60" (40') (gain: 120.00) -15C bin 2x2
Astronomik Deep Sky R 1.25": 40x60" (40') (gain: 120.00) -15C bin 2x2
Astronomik Halpha 6nm 1.25": 60x120" (2h) (gain: 120.00) -15C bin 1x1
Astronomik Halpha 6nm 1.25": 20x60" (20') (gain: 120.00) -15C bin 1x1
Astronomik UV-IR Block L3 1.25’’: 141x60" (2h 21') (gain: 120.00) -15C bin 1x1

Integration: 6h 41'

Avg. Moon age: 11.54 days

Avg. Moon phase: 88.66%

Bortle Dark-Sky Scale: 8.00

Temperature: -0.01


Basic astrometry details

Astrometry.net job: 4297089


Resolution: 4159x3316

Locations: Fontenay backyard, Fontenay sous Bois, Val de Marne, France

Data source: Backyard

Description

I had just received my new mount, the iOptron CEM70, a few days ago when a nice clear sky window happened. So I had to test it !

As my field of view is quite limited by the buildings that surround my garden downtown in a very urban area, I had to chose something that won't disappear quickly behind the roofs, which eliminates a lot of potential objects.

I have chosen the M81 group : I haven't taken galaxies for a while, and this group is nicely placed at this time of the year for me to image during a long winter night.

The night seemed to be absolutely clear, but seeing my lights afterward, I think there has been some fog, or maybe due on my refractor (though it had heating bands...), which has ruined lots of the night...

On top of that, I still don't use correctly the mount and the guiding with the ASIAIR Pro... I still have a high RMS. I will have to learn how to tweak nicely the paramters of guiding with my CEM70.

By the way, I have elongated stars, from bottom left to top right, and I don't know if that's bad polar alignement on 60sec lights, or guiding issues, or setting the timeout after dithering too low... Lots of things to learn.

In order to reduce these effects, I have used my H alpha master to reduce stars in Photoshop...

I know this is cheating, but otherwise, I wouldn't have been able to post this one...

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