Quote:
Originally Posted by CaptainCook
Hi Martin,
I've just got round to looking at my Helix data from a few weeks ago. I think thats about as much outer detail as you get in the City.
My effort is here.
This HOO image is based on best 90% of 11 hours Ha (+6h 45m O3) but to be honest I was seeing everything I was going to see after half that time.
Cheers
Gary |
Thanks Gary,
Based on simple SNR maths under B8 skies one would expect slightly more fine detail in those outer shells with say approx 35 to 40 hrs of integration but diminishing returns beyond that point.
I experimented with a stack of around 12 hours of data and the eyebrow was just visible, obviously the noise floor was significantly higher as well.
I did image the Helix with my 2600MC OSC about 2 years ago with around 8 hours of data and did manage to expose the lower eyebrow. I do believe Sydney’s Skyglow is getting worse each year. How much I don’t know but it’s definitely getting worse.
Cheers
Martin