Thread: NGC5189 in Ha
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Old 23-07-2013, 01:03 PM
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Lee
Colour is over-rated

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Join Date: Sep 2005
Location: Newcastle, Australia
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NGC5189 in Ha

After Rays sterling effort on the Bug, and Mikes on this one, I had to have a try....
Normally I would have just dialled in really long subs for Ha, but thought I'd give shorter ones a go after Ray's advice - he was right, at 2min subs the SNR is pretty low....
I'm fairly happy with how this one turned out nonetheless.

52x2min subs, Astronomik 12nm Ha, Atik 420 and Bintel 200mm f/4 newt
Was done under a very high waxing gibbous moon.

The first image is just an average combine of the subs, with no dark subtraction at all (I realised at midnight I had no 1x1 2min darks!). I slapped it together in 10 minutes before going to bed. I've included it because I think the nebula itself looks the best in this image, if you ignore the trailing hot pixels....

I found dark subtraction adversely affected the detail a fair bit, so I used a bad pixel map, and sigma clip stacking in Nebulosity for the second image, then processed again in StarTools. I had to stretch the data to within an inch of its life!

Hopefully I'll get some L and O-III subs when the moon goes....
Attached Thumbnails
Click for full-size image (NGC5189basic-ST.jpg)
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Click for full-size image (NGC5189-bpm-sd15-ST-final.jpg)
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