December 2017: Sharpless 2-240

This is a HUGE object. So it doesn’t fit into my FOV and would need a mosaic. Maybe I’ll try the mosaic, but I’ll need a moonless night to avoid gradients (which easily spoil the mosaic work).

For this image, I used H-alpha to overcome the moonlight, As it is also a weak object, I exposed 1,000-second subs. Then I took some RBG subs just to color the final image. I processed using the synthetic-R method.

Sharpless 240 signedGo to this object description and this image technical detail.

 

December 2017: Rosette revisited

This time with long H-alpha exposures. Tne Moon was almost full, but the H-alpha filter worked excepcionally well, showing little gradient.

I tested 1,000-second long exposures, instead of the 600’s that I was used to. It worked ok, with a very good guiding done by the DSI Pro.

This is the final H-alpha image (stacking of 6):

Rosette H-alpha signed

I combined this image with old RGB subs taken a year ago and that had too much noise. Teh result, I think, is wonderful (I used the H-alpha as a R component).

Rosette HGB (6X100, 4X300) signed

Go to this object description and this image technical detail.