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Contains:  IC 443, The star Propus (ηGem)
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First light Celestron 8" RASA - IC 443 - Sh2-248 in HαRGB, 





    
        

            Uwe Deutermann

First light Celestron 8" RASA - IC 443 - Sh2-248 in HαRGB

Technical card

Resolution: 2671x2902

Dates:Feb. 4, 2019Feb. 7, 2019

Frames:
ZWO B 1.25" optimized for ASI1600: 140x30" (gain: 139.00) -20C bin 1x1
ZWO G 1.25" optimized for ASI1600: 84x30" (gain: 139.00) -20C bin 1x1
Astronomik Ha 12nm 2": 47x120" (gain: 139.00) -20C bin 1x1
ZWO R 1.25" optimized for ASI1600: 141x30" (gain: 139.00) -20C bin 1x1

Integration: 4.6 hours

Darks: ~43

Bias: ~50

Avg. Moon age: 15.77 days

Avg. Moon phase: 3.10%

Bortle Dark-Sky Scale: 6.00

Temperature: 16.00

Astrometry.net job: 2516475

Locations: Home Backyard, Fleming Island, Florida, United States

Data source: Backyard

Description

After some clear nights and a lot of testing, setting adjustments, getting used to the auto focuser, etc. etc. the first result. Definitely a difference between the 'old' 4" refractor. Processing has to be adjusted as well, not that well done so far, but better than the first trials that I had and did not even dare to post 😉. Right now the RASA is out and taking some RGB images, I wanted to test this as well. The distance between focus and camera is still for the 2" filters too large, maybe 2 mm or so, since I saw already the RGB data which are much better at the edges, and this distance is ~2mm shorter. I guess I have to get another very short extender. Well, the journey just began ...

Added RGB data.

Comments

Author

udeuterm
Uwe Deutermann
License: Attribution-NonCommercial-ShareAlike Creative Commons
9102
Like

Revisions

  • First light Celestron 8" RASA - IC 443 - Sh2-248 in HαRGB, 





    
        

            Uwe Deutermann
    Original
  • First light Celestron 8" RASA - IC 443 - Sh2-248 in HαRGB, 





    
        

            Uwe Deutermann
    B
  • First light Celestron 8" RASA - IC 443 - Sh2-248 in HαRGB, 





    
        

            Uwe Deutermann
    C
  • First light Celestron 8" RASA - IC 443 - Sh2-248 in HαRGB, 





    
        

            Uwe Deutermann
    D
  • Final
    First light Celestron 8" RASA - IC 443 - Sh2-248 in HαRGB, 





    
        

            Uwe Deutermann
    E

B

Added RGB data to the Hα. I only own 1.25" LRGB filters, and that clearly is not enough for this setup, the edges were almost black, so I had to crop out quite a bit of the field. I might use my 'old' Altair color camera for RGB shots in the future, I will see how this works out. Additionally the processing is still to improve, even 30 seconds exposures for RGB data are with the 8"RASA quite impressive in how much information it collects.

C

Color neutralization and luminance adjustments.

D

For Jirair to show what the original stacked R filter image looks like.

E

Further processing. Reduced star sizes, increased luminosity of red filtered channel.

Histogram

First light Celestron 8" RASA - IC 443 - Sh2-248 in HαRGB, 





    
        

            Uwe Deutermann