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NGC6888 and the soap bubble with Skyvision MT250 and ASI1600

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#1 chonum

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Posted 20 August 2016 - 04:08 AM

My first image with the ASI1600 on the SkyVision MT250 Zerodur. Besides a tilt issue between the Wynne and the camera, it went very smoothly. As I have a very good Skymeca assembly and a FLI CFW, maybe a tilt on the sensor side ?

 

14h exposure, 0.91"/pixel, seeing between 1,5 and 2,5" on the NSM.

Set up:
- SkyVision MT250 Zerodur and Wynne ASA 3", f/3.3
- FLI Atlas focuser on Skymeca mecanics
- SHO Astrodon 50mm (Ha/SII 6nm, OIII 3nm) in FLI FW
- AP900GTO mount
- Alcor Prism 9 and 10 automatic acquisition
- Preprocessing PixInsight
- Processing PI + PS CS6

 

I made a very soft tonal layer assembly as the SII signal is pretty weak here. It is rather [H+S][H+O][O]

 

 

The full image is here 

 

NGC6888_small.jpg

NGC6888_neb.jpg

NGC6888_bubble.jpg


Edited by chonum, 20 August 2016 - 04:10 AM.

  • schmeah, Alterf, AndreyYa and 7 others like this

#2 AndreyYa

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Posted 20 August 2016 - 02:54 PM

Hi,

images look really impressive, thank you. 

 

Could you please comprehend about camera modes (gain, subexposure durations etc.)?

ASI1600 is pretty new for all us, so every detail is important...

 

Thank you,

Andrey.



#3 chonum

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Posted 20 August 2016 - 04:25 PM

Hello Andrey, the ASCOM setting is the maximum dynamic. Subs are 10mn, here is a calibrated image :

 

http://astrochonum.c...011 (2)_cal.zip

 

Note that I didn't use the lastest firmware that is supposed to reduce or solve the ampglow.

Anyway the ampglow is reasonable on 10mn subs.

I didn't make 20mn sub as usual for the read out noise is quite low, I measured it at 3,7e-.



#4 vdb

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Posted 21 August 2016 - 01:17 AM

Amazing how you get the bubble to show when in your stack it is barely visible! 

 

/Yves



#5 chonum

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Posted 21 August 2016 - 04:24 AM

‚ÄčThe image I posted is a sub exposure, not the full stack :)



#6 AndreyYa

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Posted 21 August 2016 - 05:04 AM

Hello Andrey, the ASCOM setting is the maximum dynamic. Subs are 10mn, here is a calibrated image :

 

http://astrochonum.c...011 (2)_cal.zip

 

Note that I didn't use the lastest firmware that is supposed to reduce or solve the ampglow.

Anyway the ampglow is reasonable on 10mn subs.

I didn't make 20mn sub as usual for the read out noise is quite low, I measured it at 3,7e-.

Great, the amp glow  just disappeared. I barely could guess it only by higher noise level on the image corner.



#7 chonum

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Posted 21 August 2016 - 11:42 AM

The latest firmware or ASCOM driver is supposed to reduce the ampglow, maybe somebody tested it ?




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