I'm so ronery

[Peter Ward]

I don't why but this one reminded me of Kim Jong's song in the movie
"Team America"

After six hours of Ha exposure I had hoped to maybe find a glimmer of an outer shell in the Helix.

Nup. Zip. Nothing there....and I can't get that six hours of exposure time back :rolleyes:....

Result here
(https://www.atscope.com.au/BRO/gallery665.html)

[Nikolas]

Try 20 hours, the outer shell is very faint.

[Addos]

sounds about right based on my experience Peter. This image https://www.astrobin.com/i65yru/ is up to ~44hrs Ha @ f7 and I'm only just starting to see the outer shell come through.


I think if you've got a faster system, or are really good at continuum subtraction you may be able to wrangle more out of less data...

[Peter Ward]

Yep..I went about 40 hours a few years back with my 305 AP RHA @ F3.8 (attached)

I was looking for something much further out, but nothing even hinted at beyond a degree or so. :shrug:

[CaptainCook]

I have just been asking myself this same question- I imaged this 2 days ago, after clouds had moved in but then at midnight it cleared so I managed to set up again and get 3 hours of Ha. I was about to call it quits in favour of O3 data, but might be worth more data?

[gregbradley]

Or use 17 inches of aperture at a fast F4.48. Then you only need 4 hours
and 45 minutes!

https://pbase.com/gregbradley/image/150551764

Greg.

[Peter Ward]

Impressive :thumbsup:

[Startrek]

Excellent image Greg
Yes larger aperture faster scopes are the order of the day for PN imaging plus loads of data !!

Martin