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PostPosted: Thu Nov 22, 2012 1:44 pm 
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Hi folks,

Hot off the press after a marathon session a few nights ago here is my first sight of the California Nebula.

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    The California Nebula (NGC 1499) - RGB + Ha

5 x 200 seconds each of RGB plus 8 x 1000 seconds of Ha. When the new filters arrive I hope to add to the data with SII and OIII.

For our USA friends as today is thanksgiving day - Happy Thanksgiving.

Bob.

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OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


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PostPosted: Thu Nov 22, 2012 10:48 pm 
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Looks beautiful, great job :D
One question, what is the bright spot on the top of the image a little off to the left?

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PostPosted: Fri Nov 23, 2012 12:15 am 
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Hi pierovera

Glad you like it. The object you refer to is just a star but, unlike pretty much all the other stars you can see, it is actually visible to the naked eye although maybe not from a city centre. It is actually what lights up the nebula, not by reflected light but by ultra-violet light that energises the atoms in the gas cloud which then emit visible light as their electrons drop back down into lower energy states.

Maybe that's too much information but you might want to have a quick look at the headline numbers for the star. It's called Xi Persei or Menkib and you can find an easy to read and brief summary at Wikipedia here. Check out its total luminosity (all wavelengths) compared to our Sun. :shock:

Bob.

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Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


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PostPosted: Fri Nov 23, 2012 12:22 am 
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I think I might have heard about that star before. Thanks Bob! :)

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Visit me and leave me a comment in My Flickr :)


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