M1 The Crab reprocessed or why I just threw away 10 hours of precious data!

[Bizibilder]

Just to see if i could improve my Crab Nebula project i have been through all the 5min subs (all 276 of them!) and discarded any that showed any signs of haze, fuzziness, excess light pollution, etc and restacked the "good" ones.  This resulted in a discard of 10 hours of data - the resulting image is made up from 13hours and 30 mins of 5 min subs.  It has certainly had a dramatic effect!!:

Link to full size:  http://farm3.staticflickr.com/2865/11656237626_f107062cd2_o.jpg

2000 Px square crop:

And a full size crop of the nebula:

[cosmicdonkey]

Awesome

[Naemeth]

Wow, it certainly does make a difference . You can see a lot more detail in M1 itself in this set, but it is definitely noisier.

For those that haven't seen the original, it's here.

[Tim]

Getting better Roger

What I normally do with the dodgy data is try the stack with and without, and make sure the reference image is the best one, and with a robust enough sigma reject to get rid of the worst of the outliers.

Cheers

Tim