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  #1  
Old 19-06-2017, 04:41 PM
markas (Mark)
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NGC 6164-5 work in progress

The central star in this complex is an O class of ~40 solar masses. It is nearing its end of life, and has been subject to mass loss events (something like Eta Carinae?). It is thought to be destined to end as a supernova

The dumbell-like inner shell has the two designations: NGC 6164 and 6165.

The very faint outer shell - mainly OIII - is only rarely imaged, as it is extremely tenuous.

This image was shot with ASA10N at f/6.8; Moravian G3-16200; DDM85 unguided. 2hr40min OIII, 2hr30min Ha, 1hrRGB all binned X2, as I was prepared to sacrifice resolution for photons. The image structure is essentially Ha to red, OIII to green and blue, RGB star colours.

Having processed it, it is clear I could use another 4hr OIII to advantage, so it is a work in progess

FOV is approx 40' square,
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  #2  
Old 19-06-2017, 04:49 PM
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gregbradley
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A very nice image. As you say it would improve with some more exposure time but looking very good so far.

Greg.
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  #3  
Old 19-06-2017, 04:58 PM
Placidus (Mike and Trish)
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Excellent! You're picking up unbelievably faint hints of OIII in the outer shell toward 2 o'clock which didn't show up when we did it unbinned. We're going to have to do it all again now.
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  #4  
Old 19-06-2017, 05:50 PM
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multiweb (Marc)
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Those Oiii bubbles really popup. Great colours.
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  #5  
Old 19-06-2017, 05:53 PM
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cometcatcher (Kevin)
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That's deep. Nice OIII details.
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  #6  
Old 19-06-2017, 06:46 PM
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Looking great so far, can't wait to see the finished result
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  #7  
Old 19-06-2017, 07:59 PM
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RickS (Rick)
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Nice work, Mark! Love the colours. The Oiii on this puppy is seriously faint.
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  #8  
Old 19-06-2017, 08:49 PM
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lazjen (Chris)
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Did you do this in Melbourne?

No matter where, it's great so far, and like others have said, look forward to the final result.
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  #9  
Old 19-06-2017, 11:49 PM
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One of my favs and you've already more than done it justice Mark!
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  #10  
Old 20-06-2017, 06:42 AM
topheart
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Well done!!
Cheers,
Tim
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  #11  
Old 20-06-2017, 09:01 AM
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strongmanmike (Michael)
Woohoo it's clear

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Very nice image Markas, I think it looks fine already, the outer OIII shell is looking well revealed

Mike
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  #12  
Old 20-06-2017, 09:16 AM
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traveller (Bo)
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Great stuff, can't wait to see the final product.
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  #13  
Old 21-06-2017, 07:46 AM
markas (Mark)
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Thanks to all for your comments. Very much appreciated.

Chris, it was shot from the north side of Macedon near Hanging Rock. I don't know how well the very faint OIII areas would show from Melbourne. As it was, the OIII stack was quite noisy with a reasonably dark sky (SQL 21.3), whereas the Ha was very clean.

Not sure when I'm going to get the extra OIII - this dark time looks unprospective, so it's probably a month away.....

Mark
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  #14  
Old 21-06-2017, 08:08 AM
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Atmos (Colin)
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That's really nice!
I had been wanting to image this this new moon, doesn't look like that's going to happen :/
With some more OIII some of that fault stuff will come up a lot cleaner
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  #15  
Old 21-06-2017, 03:00 PM
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Hi Mark,

Very nice picture and great job
Looking forward to seeing it with the next 4 hours OIII.
We are working on it too

Tom
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  #16  
Old 21-06-2017, 06:37 PM
Stevec35 (Steve)
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Certainly looking good so far

Cheers

Steve
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  #17  
Old 23-06-2017, 09:02 AM
markas (Mark)
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Steve, APO,

Thanks for the comments - I hope I don't have to wait too long for the extra OIII.

Mark
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  #18  
Old 23-06-2017, 08:33 PM
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marc4darkskies (Marcus)
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Nice work so far Mark - colours look spot on and the shell pops!
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  #19  
Old 25-06-2017, 12:32 PM
markas (Mark)
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Thanks Marcus.

Mark
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  #20  
Old 25-06-2017, 02:16 PM
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atalas
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Awesome Mark....well done
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