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Saturday, September 27, 2008

Butterfly Nebula, second try

This narrow band color image is a combination of two channels, H-alpha = Red
O-III = Blue. Green channel is Synthesized from Red and Blue. -
Conditions were not too good last night, hard wind and clouds.
Guiding was really difficult doe the wind but PHD-guiding software does its best.
There was jus enough gaps between clouds, that I managed shot data for H-alpha
and O-III not enough though.
Actually part of the frames are shot trough not so thin clouds, maybe
H-alpha acts as a cloud filter : )
S-II data had to be left to the next time after the clouds rolled in.
Part of the NGC6888 the "Crescent Nebula" can be seen in the bottom of the image.
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Imaging data:
-
Camera,
QHY8
- Filters,
Baader 7nm H-alpha and Baader 8,5nm O-III
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Optics,
Tokina AT-X 300mm @ f2.8
- Exposures,
5 X 1200s H-alpha
3 X 1200 O-III
+ flats and bias
- Guiding,
LX200 GPS 12" + PHD-guiding and Lodestar

H-alpha channel

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