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Old 18-04-2021, 11:08 AM
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The Dragon's Egg

This was an experiment at a dark sky site last weekend. I've never done narrowband under a dark sky before, and was curious to see how much better it was (theoretically, it should get the same proportional benefit as RGB (in my case 5xfewer exposures), though things like read noise start to spoil that boost, as the background light levels are so low and you're well short of sky limited in the dark site).

Took some OIII of NGC 6164/6165 in Ara to try to get the faint OIII shell around the bipolar nebula. It does seem to benefit greatly from the dark sky - I have got a worse image from considerably more data in the 'burbs. Of course that would happen - but it was good to put theory to test

The weird red bit on the left tip of the bipolar nebular is real I think - the OIII suddenly stops (at almost a sharp line!) and just the red Ha continues, so you get this sudden transition from a sort of pinky colour to pure red in the HOO rendition. Kind of ugly, but not too sure what to do with it! Tips appreciated.

Obviously needs more data - as clouds/short time of stay limited what I could do.

Astrobin version here.
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Old 18-04-2021, 04:59 PM
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Beautifully done Paul.

Terrific detail in the neb as well.

Greg.
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Old 18-04-2021, 05:09 PM
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Thank you, Greg.
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Old 18-04-2021, 10:36 PM
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That outer shell is extremely intricate and draws the attention. Nicely processed to bringing out the subtle details
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Old 19-04-2021, 06:45 AM
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Nicely done Paul ,I haven't personally seen this one before. I am going to put this one on my list to do
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Old 19-04-2021, 06:57 AM
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Quote:
Originally Posted by Ryderscope View Post
That outer shell is extremely intricate and draws the attention. Nicely processed to bringing out the subtle details
Thank you, Rodney.

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Originally Posted by Kuz View Post
Nicely done Paul ,I haven't personally seen this one before. I am going to put this one on my list to do
Thanks. Yes, it is a fun little object.
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Old 19-04-2021, 09:01 AM
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Quote:
Originally Posted by DiscoDuck View Post

The weird red bit on the left tip of the bipolar nebular is real I think - the OIII suddenly stops (at almost a sharp line!) and just the red Ha continues, so you get this sudden transition from a sort of pinky colour to pure red in the HOO rendition. Kind of ugly, but not too sure what to do with it! Tips appreciated.

Obviously needs more data - as clouds/short time of stay limited what I could do.

Astrobin version here.
Are you referring to that very red kind of lip on the left edge of the inner PN in your image? If so then yes it is real, it is in my image (all be it at a coarser image scale of 1.6"/pix) from a few years back

Lovely HaOIIIOIII image BTW, your image scale is very fine indeed, what are you imaging at 0.4"/pix?

Mike
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Old 19-04-2021, 09:21 AM
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Originally Posted by strongmanmike View Post
Are you referring to that very red kind of lip on the left edge of the inner PN in your image? If so then yes it is real, it is in my image (all be it at a coarser image scale of 1.6"/pix) from a few years back

Lovely HaOIIIOIII image BTW, your image scale is very fine indeed, what are you imaging at 0.4"/pix?

Mike
Thanks Mike. Good to know that red bit is real. Tempted to try to reduce its severity though as it is ugly!

I'm imaging at 0.65" per pixel (1200mm with a focal reduced RC8 (f8->f6)). Seems to be a sweetish spot on nights of good seeing. But oversampled on others of course. You can't have your cake and eat it ... so I'm told!
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Old 19-04-2021, 10:02 AM
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Thanks Mike. Good to know that red bit is real. Tempted to try to reduce its severity though as it is ugly!
Hmmm?..I think you are worrying about Cindy Crawford mole ....

Quote:
I'm imaging at 0.65" per pixel (1200mm with a focal reduced RC8 (f8->f6)). Seems to be a sweetish spot on nights of good seeing. But oversampled on others of course. You can't have your cake and eat it ... so I'm told!
Ah, you are using a reducer. 0.65"/pix is pretty fine, can't imagine needing to go any finer than that in Oz..?

Mike
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Old 22-04-2021, 09:40 AM
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this is amazing... moving from art into science but still looking great!
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Old 22-04-2021, 02:27 PM
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this is amazing... moving from art into science but still looking great!
Thanks. I know little about art .... much more about science
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Old 23-04-2021, 10:53 AM
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Nice egg Paul you got some good detail in the O3

cheers

russ
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Old 23-04-2021, 12:46 PM
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Great work the egg really stands out a treat!
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Old 23-04-2021, 01:58 PM
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Good job keeping that outer shell fine while bringing it out from the background nebulosity, Paul.

I did this one a month or two back, too, and can appreciate the balance here.
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Old 24-04-2021, 06:44 AM
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Nicely done Paul. The intricate swirls at the top of the outer shell look really good when zoomed in closely
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Old 24-04-2021, 06:49 AM
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Quote:
Originally Posted by rustigsmed View Post
Nice egg Paul you got some good detail in the O3
Thanks Russell.

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Originally Posted by Nikolas View Post
Great work the egg really stands out a treat!
Thanks Nik.

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Originally Posted by jahnpahwa View Post
Good job keeping that outer shell fine while bringing it out from the background nebulosity, Paul.

I did this one a month or two back, too, and can appreciate the balance here.
Thanks JP. Yes, it is a delicate structure and hard to bring out and yet keep it natural.

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Nicely done Paul. The intricate swirls at the top of the outer shell look really good when zoomed in closely
Thank you, Geoff.
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Old 24-04-2021, 10:05 PM
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That's a gem!
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Old 26-04-2021, 07:49 AM
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That's a gem!
Thanks Chris.
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Old 27-04-2021, 11:35 AM
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An impressive field Paul! Very nicely done!
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Old 28-04-2021, 07:39 AM
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An impressive field Paul! Very nicely done!
Thanks Marcus.
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