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M13 lucky imaging

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#1 happylimpet

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Posted 20 May 2025 - 02:30 PM

Evening,

 

This is about an hour of 20ms exposures, unfiltered (so UV to IR) of the core of M13 with my standard DSO setup (12" newtonian on EQ8), but with a tiny ROI of 504x440 pixels. I used my ASI294MM which can be used unbinned with 2.3u pixels (I think most people use it binned - i generally do) to give a good resolution - 0.4" at newtonian focus, and this is 2x resampled in autostakkert to give 0.2" per pixel.  The measured FWHM is 0.65" (about 3 pixels). FOV is 3.5 x 3.0 arc minutes.

 

Its not quite HST, but not bad! Coincidentally its almost exactly the same FOV as a widely circulated HST pic of M13, and my image is only about 8x worse resolution! Guess which is which? Maybe I'll do colour sometime....

 

m13-xlarge_web-jpg_3.jpg 2025-05-19-2345_9-NJH-!Lum-MarsBOTH q351 v_AS_P40_lapl6_ap692_Resample20_WD_294unbinned 2xresample3 lvls_5.jpg

 

 

2025-05-19-2345_9-NJH-!Lum-MarsBOTH q351 v_AS_P40_lapl6_ap692_Resample20_WD_294unbinned 2xresample3 lvls.jpg

 

 


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#2 bobzeq25

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Posted 20 May 2025 - 03:05 PM

Nice. Good to see a DSO imager using the term "lucky imaging" correctly, at about 50 frames per second.

Edited by bobzeq25, 20 May 2025 - 03:06 PM.

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#3 smiller

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Posted 20 May 2025 - 05:27 PM

Well done!

 

What software did you use to align and stack the lights?  

 

Also, what percentage of the lights did you keep?

 

The short exposures and small ROI can make it difficult for me to align as there aren’t that many stars.  Of course it helps that this is a cluster of stars, so perhaps that makes this a special case!   

 

I’ve been wanting to try for a higher res capture of the core…


Edited by smiller, 20 May 2025 - 05:29 PM.

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#4 happylimpet

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Posted 20 May 2025 - 05:31 PM

Cheers chaps. I forgot to say I ordered the frames by quality in Pipp, also dark subtracting there. I got rid of about 2/3, was left with about 40000 or around 15 mins worth. Rough numbers! Stacked in autostakkert. Used multi scale APs, size 32 up. Plenty of stars visible across each sub, but still needed larger APs at the edges where fewer stars.
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#5 smiller

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Posted 20 May 2025 - 05:33 PM

Thanks!  Is there a reason why you used PIPP for frame quality versus Autostakkert?


Edited by smiller, 20 May 2025 - 05:33 PM.


#6 happylimpet

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Posted 20 May 2025 - 11:15 PM

Thanks!  Is there a reason why you used PIPP for frame quality versus Autostakkert?

Yes - so i could just delete the bad frames (I keep all my raw data. but i was going to make an exception)! Though I actually havent done that yet. Also to combine with a previous evening's data into a single stackable AVI, but i forgot that the slight field rotation (from breakdown/setup) made it impossible to combine in AS. So this is just one night's data.


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#7 dhferguson

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Posted 21 May 2025 - 01:37 AM

Cheers,

 

'Good to see someone trying something different ... bravo! Great resolution, too. 'Would be interesting to see a color image obtained in the same way.

 

Happy observing always,

 

Don


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#8 happylimpet

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Posted 04 June 2025 - 09:20 AM

Just adding the approx. field of view (yellow  box) of the above image on a wider view, with the two neighbouring bright stars we all know.

 

Screenshot 2025-06-04 151850.jpg


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