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M97: A day-long, high resolution Owl

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#1 astrovienna

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Posted 20 May 2019 - 08:48 PM

I've shot tons of PNs over the years, but for some reason never got around to this one.  Too many galaxies, I guess.  The OIII halo here was a surprise to me, although now that I look around I see plenty of images with it.  There's some Ha in the halo as well,  but it's extremely faint compared to the OIII.  This is 24 hours of bicolor with a C11 and SXVR-H694 at 0.84 arcsecs/pixel under Bortle 8 skies.  Thank goodness for narrowband filters.

 

I did two stretches on this, the first for the core and the second for the halo. In the latter image, the core was of course seriously blown out.  I used the Pinch tool in Photoshop to pinch the core down to nothingness, then used Pixinsight's max operator in PixelMath to blend the core and halo images.  It seems to have worked out well, but in etrospect I  wonder if I could have removed the blown out core with Morphological Transform in PI.

 

https://pbase.com/image/169181267

 

Full resolution image, with details of capture and processing, are at the link.

 

Kevin

 

 

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#2 NorthField

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Posted 20 May 2019 - 08:50 PM

You got the halo in spades!!

#3 elmiko

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Posted 20 May 2019 - 11:19 PM

Beautiful image Kevin!



#4 Michael Deger

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Posted 21 May 2019 - 03:01 AM

Hi Kevin,

 

very nice version of M 97!

 

All the best

Michael

 

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#5 IshanAstronomer

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Posted 21 May 2019 - 03:39 AM

The outer halo isn't symmetric about the central star. That's a surprise.



#6 Terry R

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Posted 21 May 2019 - 05:00 AM

Very nice.  I do like the colours.



#7 lucam

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Posted 21 May 2019 - 05:12 AM

That's really well done, Kevin!



#8 astrovienna

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Posted 21 May 2019 - 08:50 AM

You got the halo in spades!!

Thanks Mark!  The image on your Abin page is very nice.  How did you handle the halo challenge?



#9 astrovienna

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Posted 21 May 2019 - 08:52 AM

Beautiful image Kevin!

 

 

Hi Kevin,

 

very nice version of M 97!

 

All the best

Michael

 

http://galaxyphoto.de

Thank you, Mike and Michael. It's nice to shoot a bright PN every now and then to go with all my faint, obscure ones.  :) 

 

The outer halo isn't symmetric about the central star. That's a surprise.

I've seen that on some other halos. I think it has to do with the motion of the progenitor star through the local ISM.  There's some compression in the direction of travel.



#10 jhayes_tucson

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Posted 21 May 2019 - 09:23 AM

Wow!  That’s a superb Owl image.  The details and colors look excellent.  Well done!

 

John



#11 NorthField

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Posted 21 May 2019 - 11:16 AM

Thanks Mark!  The image on your Abin page is very nice.  How did you handle the halo challenge?

Thank you...

 

i misused the dark structure enhance script :)

 

i ran the script, and extracted the mask... with that mask and some clone stampin = almost perfect halo mask



#12 astrovienna

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Posted 21 May 2019 - 11:48 AM

Wow!  That’s a superb Owl image.  The details and colors look excellent.  Well done!

 

John

Thanks John.  I appreciate the feedback.



#13 astrovienna

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Posted 21 May 2019 - 11:49 AM

Thank you...

 

i misused the dark structure enhance script smile.gif

 

i ran the script, and extracted the mask... with that mask and some clone stampin = almost perfect halo mask

Clever!  I won't rat you out to the PI guys. And I might try that myself next time.  :)



#14 Mert

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Posted 21 May 2019 - 12:21 PM

Wow, congratulations, that is seriously well done!!



#15 astrovienna

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Posted 21 May 2019 - 10:38 PM

Wow, congratulations, that is seriously well done!!

Thank you, Mert!

 

Kevin



#16 james7ca

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Posted 22 May 2019 - 12:18 AM

That's a very nice image.

 

A few years ago when I imaged the Owl using my NP127is someone commented that the reason why the halo appeared so faint in my image was that I had clipped the background. However, I had only about 100 minutes of integration time in OIII, so it wasn't because the background was clipped, just that I didn't have enough exposure to really show the halo. In any case, your 24 hours did a much better job that I got in just over three hours (total for OIII and Ha).



#17 astrovienna

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Posted 22 May 2019 - 01:52 PM

That's a very nice image.

 

A few years ago when I imaged the Owl using my NP127is someone commented that the reason why the halo appeared so faint in my image was that I had clipped the background. However, I had only about 100 minutes of integration time in OIII, so it wasn't because the background was clipped, just that I didn't have enough exposure to really show the halo. In any case, your 24 hours did a much better job that I got in just over three hours (total for OIII and Ha).

Thanks James.  Yeah, no doubt about it, time on target makes a huge difference on targets like this.  It helps to have an observatory in my backyard.  :)

 

Kevin



#18 DaveB

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Posted 22 May 2019 - 09:02 PM

Kevin,

 

Awesome image, and you are giving me some hope. I will likely be moving down to the Balt-DC corridor within the next year or two, and I'm going to try to find a place far enough from I-95 to be a class 6 (or if lucky, a class 5). It will pain me to leave my class 4-5 skies, but those pesky kids are moving to cities these days. Your gallery taken from Vienna is amazing. I used to visit my old company's HQ in Tyson's Corner, so I know what the skies are like around there.




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