Horse Head Neb in Ha [Archive]

View Full Version here: : Horse Head Neb in Ha

08-01-2015, 11:12 PM

This is a reprocess of some earlier data of the Horsehead Nebula in Ha. I managed to grab an additional five subs. The additional subs have really helped to tame the noise in the darker parts. It seems that we just don’t have the luxury of re-imaging with our weather in Melbourne, so I have cropped to reduce the effects of that crazy bright star to the left. On the plus side, I can see a few more subtle details appearing in the goatee area of the space dragon. Or was that horse?

https://www.flickr.com/photos/97807083@N00/16043770207/in/set-72157646565068452

Full Res:
https://farm9.staticflickr.com/8598/16043770207_496345f9e7_o.jpg

Terry

alpal

09-01-2015, 06:46 AM

Hi Terry,
The curtain is showing up nicely.

I know what you mean about the weather in Melbourne.
Hopefully we'll get a nice spell some time in the next 3 months.

cheers
Allan

Placidus

09-01-2015, 07:09 AM

Hi, Terry,

Better and better. From memory your shot is with an STL11000 on a 10" RC. What is the total exposure now?

Best,
Mike

marc4darkskies

09-01-2015, 08:42 AM

Excellent detail again Terry! You have that RC collimated well!

Some details on exposure would be nice.

Cheers, Marcus

09-01-2015, 11:47 AM

Thank you for your comments Marcus, Mike and Allan.

Marcus, the details. The total time was 7.8 hours. Imaged 15 km from Melbourne CBD, in the red zone according to those light pollution maps. Narrowband imaging is all I can do from here, and gradients are definitely an issue.

6 subs at 20 min 1X1 binning.
10 subs at 35 min 1X1 binning.

Camera: STL-11000m running at -15 / Scope: 10” RC f9 / Mount: AP-900 / Baader Ha Filter 7 nm

Data calibrated and stacked with CCDStack, and processed with Photoshop 6.

Mike, your memory serves you well. I did use an STL-11000 on a 10” RC. I think I have enough data for now unless we magically get some cloud free weather here that allows a total reimaging of the target with another orientation to avoid that bright star. I’m sure you appreciate just how difficult getting a suitable guide star that allows your preferred framing can be at times. That FOV in the guide chip is small.

Terry

multiweb

09-01-2015, 06:57 PM

Very nice shot. :thumbsup:

strongmanmike

10-01-2015, 10:36 AM

This is about as good as one could expect for a Ha image of the horsehead with your size and class of scope...fantastic result :thumbsup:

Mike

Rod771

10-01-2015, 11:43 AM

Very nice Terry. Lovely detail. :thumbsup:

12-01-2015, 08:02 PM

Thanks Rod, Marc, and Mike. It’s always great to get back some feedback regarding the detail within. Even without mega data, we can get lucky and capture some reasonable images to show our wife’s.
Terry

Geoff45

12-01-2015, 08:41 PM

As good as it gets Terry. Nicely done.
Geoff

RobF

12-01-2015, 09:14 PM

Wonderful and inspiring image. Hats off for collecting and processing it so well!

Ross G

14-01-2015, 08:56 AM

A great looking monochrome photo Terry.

Amazing detail!

Ross.

16-01-2015, 09:06 PM

Ross, Rob, Geoff. Thank you for the nice feedback. As good as it gets comments do make the effort worth it in the end. I remember looking at this object in text books as a kid. Taken with the big guns of scopes in the day. But today, we can grab some amazing pics with modest apertures and a bit of tech thrown in. Definitely cool.

Terry