Ggd 27

[Stevec35 (Steve)]

This one is really obscure. I asked my UK colleague if he had any suggestions for objects to image in the near infrared and he came up with GGD 27, something I've never heard of before. GGD 27 is a star formation region in Sagittarius at the heart of which is a developing protostar. This isn't a spectacular image but interesting nevertheless. Seeing was pretty poor for the most part.

Cheers

Steve

http://members.pcug.org.au/~stevec/G...L6303_RC14.htm

[Placidus (Mike and Trish)]

Forgive my density, but is it a mapping like blue = Lum, red = IR, green = half and half?

[Stevec35 (Steve)]

Originally Posted by Placidus

Forgive my density, but is it a mapping like blue = Lum, red = IR, green = half and half?

All explained in the exposure details:

LRGB with special purpose Astrodon infrared filters. L is "infrared luminance" which excludes anything less than 700nm. Red is assigned to a band peaking at about 850nm, Green peaking at about 830nm and Blue at 750nm. Exposure times were L = 200 minutes (unbinned) and R = G = 100 minutes, B=130 minutes (binned 2x2)

[Placidus (Mike and Trish)]

Originally Posted by Stevec35

All explained in the exposure details:

LRGB with special purpose Astrodon infrared filters. L is "infrared luminance" which excludes anything less than 700nm. Red is assigned to a band peaking at about 850nm, Green peaking at about 830nm and Blue at 750nm. Exposure times were L = 200 minutes (unbinned) and R = G = 100 minutes, B=130 minutes (binned 2x2)

Got it. That's magical!

[Atmos (Colin)]

That's fascinating! And to think that if I attempted imaging it, it would just be RED

[Stevec35 (Steve)]

Originally Posted by Atmos

That's fascinating! And to think that if I attempted imaging it, it would just be RED

Originally Posted by Placidus

Got it. That's magical!

Thanks guys. Infrared isn't to everyone's taste but I like it

[Slawomir (Suavi)]

I have never seen this interesting object before - thank you for sharing Steve

[Stevec35 (Steve)]

Originally Posted by Slawomir

I have never seen this interesting object before - thank you for sharing Steve

Thanks Suavi. It was certainly a new one for me too.

[multiweb (Marc)]

Very cool Steve. I need to get one of these filter set later on.

[Stevec35 (Steve)]

Originally Posted by multiweb

Very cool Steve. I need to get one of these filter set later on.

Thanks Marc. Unfortunately I don’t think Astrodon make those filters anymore.

[gregbradley]

Nice work Steve.

It seems to me this image has some scientific value.

Greg.

[Stevec35 (Steve)]

Originally Posted by gregbradley

Nice work Steve.

It seems to me this image has some scientific value.

Greg.

Thanks Greg. Don’t know about that but it’s certainly true that you see different detail with different IR wavelengths. There are quite a few papers about it.

[RickS (Rick)]

A nice and unusual catch, Steve!

[Stevec35 (Steve)]

Originally Posted by RickS

A nice and unusual catch, Steve!

Thanks Rick

[Paul Haese]

You're always imaging not oft seen targets. Tiny objects but maybe one day we might see ignition of this protostar.

[Stevec35 (Steve)]

Originally Posted by Paul Haese

You're always imaging not oft seen targets. Tiny objects but maybe one day we might see ignition of this protostar.

It’s certainly not spectacular Paul. Apparently there is a lot more intricate structure visible in the deeper infrared. Maybe it will flare up one day. Incidentally this was suggested as a target. I had never heard of it before.