Eta Carina Nebula in infra red light

[tornado33]

Hi all
Heres an IR light image of the Eta carina Nebula.
2x 5 mins ISO 800,on 10 incg f5.6 newtonian, done to see what it looks like in IR light. I didnt expect to record any nebulosity in a filter that only passes 800nm and longer wavelength light, but its there. Full moon, though that had little effect on the image.
Scott

[avandonk]

Very interesting image Scott. I used Registar to get common areas with your IR image and Photon Collectors colour image. Since both your optics are comparable in resolution I made an animated gif that flickers between the two. You can see stars brightening and appearing out of the dust and more.

Here 730k
http://members.optusnet.com.au/~avandonk1/03.gif

Bert

[leon]

Nice image Scott, I really like the IR version of this object, and Bert, now that is pretty clever, love the effect.

Leon

[tornado33]

Thats excellent Bert, indeed there are some stars al but invisible on the Vis. light image of Pauls that are bright in IR, others the opposite. Theres at least one star that appears in the IR view from within one of the dark globule areas.
Scott

[Karlsson]

Originally Posted by tornado33

I didnt expect to record any nebulosity in a filter that only passes 800nm and longer wavelength light, but its there.

I've been looking at this really interesting image several times now... and what I'm really curious about is what the doughnut shaped thingy about 2 arcmins N of HD93420 (lower right) could be?

And there are more, less obvious IR-doughnuts elsewhere too: one in Tr15, and another one just SE of HD93206.

And no... my monitor is squeaky clean...

[citivolus (Ric)]

A lot of optical systems are optimised for visible light and have internal reflections when used for IR. This could be an example of that. I know that some of my camera lenses have IR flare issues.

[seeker372011 (Narayan)]

really interesting image scott

[tornado33]

Thanks all.
I think it may indeed be internal reflections. The actual IR filter is some distance away, at the opposite end of the focuser tube then the camera and coma corrector. It could be off the coma corrector, or even the sensor cover glass which though AR coated might only be optomised for vis. light.
Scott