nandopg

Hi All,
Thanks a lot for the comments.

The phase of the life that I'm living these last 4 years has been very hard, with lots of health problems, so that is very good to get these great and inspiring words.

Regards to all my oversea friends.

Fernando

Beautiful image. Color of the nebula is great.

Fernando

NGC 4731 is deformed galaxy located approximately 65 million light-years away in Virgo. The shape is possibly related to interaction from the larger elliptical NGC 4967 around a degree away.
Apparent magnitude is 11.5. 
NGC4731 with a size of 6.6x4.2 arc minutes, has been stretched and ripped by a larger neighboring elliptical galaxy, NGC4697. 

It looks like there is not too much information about this galaxy.

IMAGE:
Luminance: 30x1200sec
Red: 20x1200sec
Green: 20x600sec
Blue: 20x1200sec

Telescope: APO 120mm f/7

Camera: SX694

Flats, Bias and Darks applied

Pre-processing and Processing: Pixinsight

NGC 6559 is a cloud of gas and dust located at a distance of about 5000 light-years from Earth, in the constellation of Sagittarius (The Archer). 
The glowing region is a relatively small object, just a few light-years across, in contrast to the one 
hundred light-years and more spanned by its famous neighbour, the Lagoon Nebula. Although it is usually overlooked in favor of its distinguished companion, I thought it is worthy capturing this image.
The gas in the clouds of NGC 6559, mainly hydrogen, is the raw material for star formation. When a region inside this nebula gathers enough matter, it starts to collapse under its own gravity. The centre of the cloud grows ever denser and hotter, until thermonuclear fusion begins and a star is born. The hydrogen atoms combine to form helium atoms, releasing energy that makes the star shine.
These brilliant hot young stars born out of the cloud energise the hydrogen gas still present around them in the nebula. The gas then re-emits this energy, producing the glowing threadlike red cloud seen near the centre of the image, as an emission nebula.
But NGC 6559 is not just made out of hydrogen gas. It also contains solid particles of dust, made of heavier elements, such as carbon, iron or silicon. The bluish patch next to the red emission nebula shows the light from the recently formed stars being scattered — reflected in many different directions — by the microscopic particles in the nebula. Then the reflection nebula,  
usually appears blue because the scattering is more efficient for these shorter wavelengths of light.
In regions where it is very dense, the dust completely blocks the light behind it, as is the case for the dark isolated patches and sinuous lanes to the bottom left-hand side and right-hand side of the image. To look through the clouds at what lies behind, 
The Milky Way fills the background of the image with countless older stars. Some of them appear fainter and redder because of the dust in NGC 6559.

Stack:
5 frames Ha 20 min
15 frames LRGB 15 min.

Telescope: LX200 f/10 with focal reducer f/6.3

Camera: Atik 314L

On 17/09/2017 at 00:54, adamphillips said:

wow. I think you've convinced me to do this in narrowband. much of the color looks natural, just with extras added.

Thanks!!

Give it a try. Don't forget to let me know about the outcome of your job.

Have a good one!!

Fernando

On 17/09/2017 at 05:16, alan4908 said:

Very impressive, I must investigate the HDR program that you used to construct the images, it has worked very well.

Alan

Thank you Alan.

As for the HDR program it is the Photomatix Tone Mapping PRO.  It is a wonderful  program for HDR and tone mapping.  I use this same program for tone mapping in my solar images.

Best Regards,

Fernando

3 hours ago, gorann said:

Great, very nice images on their own. Is that Ha, OIII and SII from top to bottom?

Thanks again!! As for the order of the masters, you are right: ha, o3 and s2, from top to bottom,

Best Regards,

Fernando

On 15/09/2017 at 12:02, ollypenrice said:

We rarely see a tricolour M42 in narrowband. Very exciting.

Olly

Thanks for the appreciation. You are a great person.

14 hours ago, gorann said:

PS.

Could you post the three mono images? Would be interesting to see where the Ha, OIII and SII regions are.

Sure, I just could not uploaded them in the same scale as the original, due to their size

On 15/09/2017 at 18:05, wimvb said:

Great image with superb processing. And, as Olly said, unusual in nb. But it clearly works.

Thank you very much for the kind comment.

This is an image that I always had curiosity to do, M-42 in narrow band. I know about the existence of some dark nebula embedded to M-43. In this image I think I was able to capture this dark right in the "junction" of M-42 and M-43. The presence of this dark nebula makes M-42 an even more amazing object for research.

The image took 17 days to be completed because of the weather conditions. The capture scheme was:
Ha: 12x900sec bin 1x1
O3: 15x900sec bin 1x1
S2: 20x900sec bin 1x1

Bias, darks and flats applied.

Pre-processing and processing in Pixinsight.
HDR assemby in EasyHDR standalone version.