NGC3293 The Pendant Now in narrowband

[gregbradley]

I was looking for something new to image and came across this one. Plus getting the more famous Gabriela Mistral nebula up top in the frame was an unexpected bonus.

http://www.pbase.com/image/167657661/large

I've now done a narrowband version as I had O111 and S11 data as well for this one.

http://www.pbase.com/gregbradley/image/167688512/large

Greg.

[Stevec35]

Nice looking image Greg - lovely colour. I've never heard it called the pendant before.

Steve

[Ryderscope]

A lovely rich field with a clusters and bright stars illuminating the scene. Good one Greg.

[gregbradley]

Thanks Steve. Its referring to the glob cluster. A new one for me. I forget the name of the more famous neb up top, its a persons name.



Cheers Rodney.

Greg.

[Stevec35]

Its referring to the glob cluster. A new one for me. I forget the name of the more famous neb up top, its a persons name.

I'm being a bit pedantic here perhaps (pun intended) but it's an open cluster, not a globular. The name you are thinking of is the Gabriela Mistral nebula so called because it resembles the profile of Gabriela Mistral, a Chilean Nobel prize winner.

[theodog]

Very nice image Greg, well composed and coloured.:thumbsup:



Nothing in this image (open or globular) is known as "The Pendant" from my understanding. Must be another new name. At least from what I could get from refgooglepedia.:)

Sorry I just found it. Yep newfangled name. I withdraw.

[gregbradley]

Ah yes I meant open cluster. Thanks for the name, that was bugging me as I couldn't recall it.



Thanks Theo.

I saw one post by another imager that refers to the Pendant Nebula. I forget where I found the original reference to it but it was called the Pendant there.

Greg.

[topheart]

Well done Greg!!
A fresh perspective.
Cheers,
Tim

[raymo]

The Pendant is not a new name for 3293. It is best known as the Gem Cluster,
but has been referred to as the Pendant Cluster in some publications over
the years. My book on imaging Southern objects is one that does. In fact
I have for many years known it as the Pendant. The description makes a little
sense because in short exposures there are two bright stars adjacent to it that
sort of make it look as though it is hanging from them when the image is appropriately
orientated. I think it is prettier than the Jewel Box.
Great image, by the way.
raymo

[strongmanmike]

Nice one Greg...maybe we really should call the cluster Gabriela's Pendant...makes sense :shrug: :)

Mike

[raymo]

Excellent idea Mike.
raymo

[Andy01]

+1^ yes indeedy :D

Nice Pic Greg :thumbsup:

[Atmos]

Very nice Greg!

[gregbradley]

Cheers Tim.



Thanks and thanks for the clarification on the name.



I didn't even realise the Gabriela Neb was nearby until I was working out the framing.







Cheers Colin.

Greg.

[gregbradley]

I added O111 and S11 data to the HaLRGB image and spent quite a bit of time on the processing.

I like this version better than the HaLRGB which seemed to lack interest and vitality. This narrowband/natural colour combine is more dynamic and shows more depth and colour.

http://www.pbase.com/gregbradley/image/167688512/large

Greg.

[Atmos]

There is a fair bit more contrast and the detail in the shock fronts is showing up a lot more than the HaRGB.
It appears as if there is a number of errant hot pixels throughout the higher signal areas but otherwise, very nice :thumbsup:

[gregbradley]

Thanks Colin. I am in the process of reinstalling most of my usual software into a new laptop. So I installed my copy of Photoninja now which gives me Noise Ninja back. I have cleaned up the noise better now.

Greg.

[Andy01]

New and improved with added S2O3! :D lol - sounds like an Omo commercial!
I like it very much Greg - lovely balance of the different wavelengths & Colours.
Nice one :thumbsup:

[cometcatcher]

I think I like the second one with the blues too. A lot of work went into this image. This kind of scares me off narrow band, cos I'm very lazy.

[gregbradley]

Cheers Andy.



Hehe, its a bit of work but I think sometimes it takes a fair bit of work to craft the image into something you like. Other times not so much.

Greg.

[Placidus]

That's a beautiful image, Greg. Trish and I much prefer the "with narrowband" version, as it shows so much more structure.

A question that I grapple with: when is what you see with an OIII filter OIII emission, when is it reflection nebulosity that just happens to include the exact colour of OIII, and when is it a mixture of both?

If the filters were perfect, and had 100% transmissivity in their bandpass and no transmissivity elsewhere, perhaps one measures A/D counts per hour through the OIII filter, and counts per hour through the OIII filter, and one has something like:

Fraction of OIII = OIII counts / Blue counts
Fraction of Reflection = the rest

In the real world, one would have to take the efficiency of the filters into account.

Once again, a lovely image.

Best,
Mike

[gregbradley]

Thanks M and T. My thought would be that reflection nebula targets like NGC6726 and the Pleaides don't really show up in O111 images as I recall.
So I expect this to be mainly simply areas of oxygen gas. I haven't done any checks but that is what I would expect to find.

Mike S's recent Blue Horsehead is a good reflection nebula and I bet nothing shows up in O111 on it.

Greg.