Sh2-155 (Cave Nebula)

3 years 4 months ago - 3 years 4 months ago #105916 by Kinch
Sh2-155 (Cave Nebula) was created by Kinch
Data gathered between 17th June & 4th July






www.kinchastro.com/sh2-155-cave-nebula.html
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3 years 4 months ago #105917 by flt158
Replied by flt158 on topic Sh2-155 (Cave Nebula)
It truly looks like a cave alright.

What constellation is that in? New nebula to me.

Beautiful image. Thanks for posting.

Clear skies,

Aubrey.

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3 years 4 months ago #105918 by Kinch
Replied by Kinch on topic Sh2-155 (Cave Nebula)
Thanks Aubrey.
It is in Cepheus. If you can - follow the link under the image. On that page I have some info (as usual making use of Wikipedia) but also put 'sky plot' diagrams - showing the exact position.
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3 years 4 months ago #105919 by johnomahony
Replied by johnomahony on topic Sh2-155 (Cave Nebula)
Beautiful image. It's a nebula that I had not heard of before.
Even more challenging with the long Summer nights. :)

The Lord giveth, the Revenue taketh away. (John 1:16)

www.flickr.com/photos/7703127@N07/
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3 years 4 months ago #105921 by flt158
Replied by flt158 on topic Sh2-155 (Cave Nebula)
I wonder what the Garnet Star (Mu Cephei) would look like in one of your images, Kinch?

In the past, I have tried to give an estimate of its varying magnitude.

Aubrey.

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3 years 4 months ago - 3 years 4 months ago #105922 by Kinch
Replied by Kinch on topic Sh2-155 (Cave Nebula)
No idea what it would look like Aubrey but I do know that it would give me no end of trouble :-)

Generally in the Nebulae shots I try to reduce the stars so that the nebulosity stands out - rather than the stars. Big bright stars give me 'trouble' because in the different narrowband filters they turn out different sizes - and when combining the three (Ha, OIII & SII) I get artifacts on the edge of the larger stars. In this image (Cave Nebula) you can see star HD 216945 (just above right of center) has a red hue to the edge. This is because the Red channel star (Mostly SII) is bigger than the star as it comes out in the HA or OIII subs.
So, regardless of other considerations - I think I would make a right mess of the Garnet Star in a narrow band image. RGB would not be such trouble - if I ever get it in any of the shots I do, I'll be sure to draw your attention to it.

Brendan.
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