Ngc 3199

[Stevec35]

As I continue my experimentation with the STXL 16200 here's a LRGB of NGC 3199, a bright nebula in Carina taken under mostly poor seeing conditions. As this nebula shows up best in narrowband images I plan to collect some Ha and OIII if the clear weather holds.

Cheers

Steve

http://members.pcug.org.au/~stevec/ngc3199_STX16200_RC14.htm

[RickS]

A nice contrast to the NB versions, Steve. I like the colours.

[Stevec35]

Thanks Rick. Actually that is the NB version. I just overwrote the LRGB when I posted the NB. You're one of the few to comment. It's not one of my popular images.

[RickS]

Well, it looks nothing like the pure NB version that I did, Steve. It has very nice natural looking colours by comparison.

[Stevec35]

It only includes Ha and OIII so that's probably why it looks natural. I was going to do SII and still might except the weather hasn't been friendly lately. Here's a Hubble palette version I did a few years back with the 12.5" RCOS. Unfortunately I've lost the data for it.

Cheers

Steve

http://members.pcug.org.au/~stevec/ngc3199_STL6303_Hubble.jpg

[RickS]

Yep, that looks a lot more narrowbandy :) I found it a really difficult object in full narrowband. I had to do some very severe colour manipulation before I was even slightly happy with the result.

[Stevec35]

I'll see how I go with it. There may be a chance of getting some SII later this week.

[Placidus]

It is tricky to show much in RGB. You've done well.

There is a lot to see in narrowband (https://photos.smugmug.com/Category/Wolf-Rayet/i-mTVpZF6/0/O/Hershel%27s%20Ring%20Ha%205%20OIII% 206%20SII%2010hrs.jpg) if you lean on it for 20 hours or so with a half-metre scope. The brighter stuff is pretty diffuse and structureless, but you can bring out some very faint sharp stuff eventually.

We like Wolf-Rayet nebulae because of what's going on: a great big pre-supernova star shedding its outer atmosphere because the radiation pressure exceeds the gravitational attraction.

There aren't so many big bright ones. Thor's Helmet would be the easiest and most photogenic, then the Gourd Nebula (Bottle-nosed Dolphin) in Canis Major. NGC 3199 is perhaps the third easiest. After that, there's a big jump to really difficult ones like RCW 58 and RCW 104.

[Stevec35]

Thanks M&T. Still hoping to get a bit of SII this week. The weather forecast is indicating tomorrow night might be okay. Haven't done Thor's helmet for a long time and never done the Gourd nebula.