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 Post subject: Crescent nebula
PostPosted: Thu Oct 03, 2019 10:06 am 
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Joined: Sun Oct 25, 2009 3:56 pm
Posts: 1321
Location: Caithness
The Crescent nebula imaged last night. This really needs narrowband filters to see the full detail, but I'm still pleased with the result. 10x300sec + 2x600sec using the Altair Astro 60EDF and Starlight Express SXV H9-C.

"The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. It was discovered by William Herschel in 1792. It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000 to 400,000 years ago. The result of the collision is a shell and two shock waves, one moving outward and one moving inward. The inward moving shock wave heats the stellar wind to X-ray-emitting temperatures."

Image

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BRIAN
Celestron Nexstar 8SE, Ioptron CEM 25P mount
Altair Astro 102 ED refractor with Lunt B600 CaK diagonal
Coronado PST DS, Daystar Quark
ZWO ASI120MM camera, Canon 1000D (astro modified), Starlight Express SXV H9-C.
Gallery: http://www.astrobin.com/users/smerral/


Last edited by smerral on Thu Oct 03, 2019 6:54 pm, edited 1 time in total.

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 Post subject: Re: Crescent nebula
PostPosted: Thu Oct 03, 2019 5:05 pm 
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Joined: Fri Dec 03, 2004 9:58 pm
Posts: 3628
Location: Wellingborough
Dear Brian,

yes, I do like this image. Can I ask which mounting/setup you are using with the 60EDF for these 10min exposures? It's certainly coping well with the tracking requirement!

regards,

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Brian
52.3N 0.6W
Wellingborough UK.

254mm LX90 on Superwedge, WO ZS66SD, Helios 102mm f5 on EQ1, Hunter 11x80, Pentax 10x50
ASI120MC Toucam Pros 740k/840k/900nc mono, Pentax K110D
Ro-Ro roof shed


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 Post subject: Re: Crescent nebula
PostPosted: Thu Oct 03, 2019 6:47 pm 
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Joined: Sun Oct 25, 2009 3:56 pm
Posts: 1321
Location: Caithness
Thanks Brian. :)
I'm using the Ioptron CEM 25P, which I find an excellent mount. I use the QHY polemaster to polar align. I am guiding using a finder guider and PHD2. :)

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BRIAN
Celestron Nexstar 8SE, Ioptron CEM 25P mount
Altair Astro 102 ED refractor with Lunt B600 CaK diagonal
Coronado PST DS, Daystar Quark
ZWO ASI120MM camera, Canon 1000D (astro modified), Starlight Express SXV H9-C.
Gallery: http://www.astrobin.com/users/smerral/


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 Post subject: Re: Crescent nebula
PostPosted: Fri Oct 04, 2019 6:47 pm 
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Joined: Fri Dec 03, 2004 9:58 pm
Posts: 3628
Location: Wellingborough
That setup performs very nicely indeed 8)

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Brian
52.3N 0.6W
Wellingborough UK.

254mm LX90 on Superwedge, WO ZS66SD, Helios 102mm f5 on EQ1, Hunter 11x80, Pentax 10x50
ASI120MC Toucam Pros 740k/840k/900nc mono, Pentax K110D
Ro-Ro roof shed


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