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NEOWISE, double ion tails July 12

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16 replies to this topic

#1 17.5Dob

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Posted 12 July 2020 - 06:42 PM

NEOWISE saved its best, for my last feasible morning shot, after 8 straight mornings...

50106200616_689e5cc9d1_h.jpg


Edited by 17.5Dob, 12 July 2020 - 06:43 PM.

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#2 calypsob

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Posted 12 July 2020 - 06:48 PM

Awesome. Are yous stacking these in Pixinsight? How in the world have you had 8 days of clear skies? 


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#3 17.5Dob

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Posted 12 July 2020 - 07:04 PM

Awesome. Are yous stacking these in Pixinsight? How in the world have you had 8 days of clear skies? 

I'm too used to stacking in DSS to give it up...90% of the PP on the DSS stack is done in Pi, and some finishing tweaks in PS.

Out of the 8 mornings, I had two, where I was shooting through 15-30" cloud windows, and barely managing 2-4 stackable subs..the rest had to rest as single shots....2 more mornings, I had enough clouds passing through, that I was only able to get 10-15 min of stackable subs out of my 20 min window. One morning was perfectly clear, but an inversion had trapped a lot of moisture and pollution right at ground level/ "Comet Level" and really hurt.

This morning was the best conditions I've had...clear to the horizon..and an additional 6-8 min of shooting time with sunrise later and comet rise ealier..


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#4 nyairman

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Posted 12 July 2020 - 07:17 PM

The best detail of the tails I have seen yet Dave. Great job! I wish I had your skies.

#5 RyanSem

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Posted 12 July 2020 - 07:30 PM

You've had some insane weather - I'm constantly jealous looking at your pictures. This is indeed the best one yet!

(Not sure, but it looks like one star overlapped the nucleus of the comet when you stacked). 



#6 Hawker

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Posted 12 July 2020 - 07:33 PM

Wow, great shot.  Very impressive!



#7 Alen K

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Posted 12 July 2020 - 08:00 PM

Beautiful image.

 

PS. Can you provide tech details? 


Edited by Alen K, 12 July 2020 - 08:01 PM.


#8 sunnyday

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Posted 12 July 2020 - 08:08 PM

wow, superb shot , love the details , thanks .



#9 Bretw01

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Posted 12 July 2020 - 08:26 PM

Great shot Dave, nice processing also.


Edited by Bretw01, 12 July 2020 - 08:27 PM.


#10 17.5Dob

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Posted 12 July 2020 - 08:27 PM

Beautiful image.

 

PS. Can you provide tech details? 

I realized I'd hit the photon collecting wall using my kit zoom lens at f5.6...so I pulled out my Nikon 180 prime and shot at f4.0 ( the CA wide open is TERRIBLE)

The skies were the clearest out of the eight mornings I've been out, so with an extra 8 min plus of darkness, (since I started last Monday), and a few more minutes of the Comet rising earlier, I was able to start shooting 10min earlier than I had been...

That added up to 160 subs, starting at 13" and tapering down to 6"...

The gradients were minimal, so using GDX didn't add that much extra noise...

This is still a work in progress, as it's "Star Stacked" ..and there's major movement of the comet over the shooting time...I'm tearing my hair out trying to get a decent Comet Stacked/Star stacked image...



#11 Alen K

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Posted 12 July 2020 - 08:39 PM

This is still a work in progress, as it's "Star Stacked" ..and there's major movement of the comet over the shooting time...I'm tearing my hair out trying to get a decent Comet Stacked/Star stacked image...

Let us know what works. I tried the comet+stars mode in DSS on C/2017 T2 (PANSTARRS) a little while back and it failed big time. Star-aligned worked (of course) and comet-aligned worked but not both together. But I don't know how to clean the streaky stars from the comet-aligned image in order to composite it with a stars-only image scrubbed of the blurry comet, so I never did get a final image. 



#12 ButterFly

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Posted 12 July 2020 - 08:46 PM

This is definitely and APOD shot.



#13 17.5Dob

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Posted 12 July 2020 - 09:25 PM

Let us know what works. I tried the comet+stars mode in DSS on C/2017 T2 (PANSTARRS) a little while back and it failed big time. Star-aligned worked (of course) and comet-aligned worked but not both together. But I don't know how to clean the streaky stars from the comet-aligned image in order to composite it with a stars-only image scrubbed of the blurry comet, so I never did get a final image. 

The stacking process works perfectly, but something goes horribly wrong with the color calibration in "Comet + Stars" vs "Comet" or just a straight star stack


Edited by 17.5Dob, 12 July 2020 - 09:27 PM.


#14 cdndob

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Posted 12 July 2020 - 10:00 PM

Very nice!

 

I hoped to get out to try for a shot like that (two tails) but I'm still clouded out here.



#15 sharkmelley

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Posted 13 July 2020 - 03:14 AM

Very nicely processed! 

 

The two ion tails are well separated. In my own data I found them to be jumbled together.

 

Mark



#16 Alen K

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Posted 13 July 2020 - 09:36 AM

The two ion tails are well separated. In my own data I found them to be jumbled together.

That suggests that the ion tails could be moving and/or changing in other ways (width, brightness) over time. It wouldn't be at all surprising, 



#17 whwang

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Posted 13 July 2020 - 09:59 AM

Is one of the two ion tails orange in color?  That's highly unusual I think.




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