ngc 2237 and surrounds in narrow band

[caliu]

If our eyes could see colors in this part of the electromagnetic spectrum, surely they would see these colors.
In NGC 2237 ionized hydrogen and sulfur are the two components of this area mostly hot gas, so we would tend to see orange red.
In the center circle, but this element is oxygen, so we would see teal blue.
This huge cloud of gas and dust born NGC 2244, this open cluster that lies at the center of the nebula and thanks to its heat and ionization enables the brightness of this gas.

This image was taken with a CCD camera in Ha (14 hours) OIII (14 hours) and IBS (9 hours), 37 hours total exposure, from near the city of Valencia (Spain)

The capture was made by Alfonso Carreno (MPC J09) = http://http://www.zonalunar.com/  and processed by Ferran Bosch (space_colors) = http://www.caliu.fotografiaastronomica . com



100% size: http://caliu.fotografiaastronomica.com/Roseta_narrow_full.jpg

I hope you enjoy

Best
Ferran.

[Juan Conejero]

Hi Ferran,

Nice color palette application and nice image.

What have you used to register the images? There seem to be serious image registration errors, especially on the central area. I hope you haven't used PI for this task, or otherwise I'd be very interested in knowing what happened.

If you didn't register the images with PI as I suspect, then I strongly encourage you to redo the whole data set with an application able to register images accurately.

[Geoff]

Lovely colours. Thanks to Juan's comment I now see the registration problem as immediately obvious, but I doubt that I would have noticed it otherwise. This is the benefit of constructive criticism.
Geoff

[joakin]

very  nice
saludos
joakin

[caliu]

Hi Ferran,

Nice color palette application and nice image.

What have you used to register the images? There seem to be serious image registration errors, especially on the central area. I hope you haven't used PI for this task, or otherwise I'd be very interested in knowing what happened.

If you didn't register the images with PI as I suspect, then I strongly encourage you to redo the whole data set with an application able to register images accurately.

Juan, desgraciadamente las he registrado con PixInsight, lo he probado de las dos formas, con StarAlignment y manualmente con DynamicAlignment, lo he probado con las imágenes lineales, con las imágenes estiradas, de todas las formas posibles y nada de nada, lo he probado con otros programas y el resultado es el mismo.

[Geoff]

Juan, desgraciadamente las he registrado con PixInsight, lo he probado de las dos formas, con StarAlignment y manualmente con DynamicAlignment, lo he probado con las imágenes lineales, con las imágenes estiradas, de todas las formas posibles y nada de nada, lo he probado con otros programas y el resultado es el mismo.

It's not really unfortunate.  I'm sure Juan will enjoy the challenge of sorting this one out.  The weird part is that it is not uniform over the whole region. The fact that other software packages give the same result suggests it must be something inherent in the images.
Here is a quote from the StarAlignment documentation:
This initial step is a critical part of the image registration task. If stars are not detected accurately, the whole process will fail, or it will perform unreliably.
Could it be that something in one of the component frames is preventing accurate star detection in the centre region.  I say one, because it seems to me that two of your frames register correctly and one doesn't.
Geoff

[Philippe B.]

very nice image and color palette choice ! I like !

I got something close in my narrowband process

[caliu]

Juan, desgraciadamente las he registrado con PixInsight, lo he probado de las dos formas, con StarAlignment y manualmente con DynamicAlignment, lo he probado con las imágenes lineales, con las imágenes estiradas, de todas las formas posibles y nada de nada, lo he probado con otros programas y el resultado es el mismo.

It's not really unfortunate.  I'm sure Juan will enjoy the challenge of sorting this one out.  The weird part is that it is not uniform over the whole region. The fact that other software packages give the same result suggests it must be something inherent in the images.
Here is a quote from the StarAlignment documentation:
This initial step is a critical part of the image registration task. If stars are not detected accurately, the whole process will fail, or it will perform unreliably.
Could it be that something in one of the component frames is preventing accurate star detection in the centre region.  I say one, because it seems to me that two of your frames register correctly and one doesn't.
Geoff

Complete agreement Geoff, we will see Juan says

[caliu]

very nice image and color palette choice ! I like !

I got something close in my narrowband process

awesome image Philippe

[Juan Conejero]

The weird part is that it is not uniform over the whole region. The fact that other software packages give the same result suggests it must be something inherent in the images.

Indeed. Caliu, have you registered *all* the individual light frames for each filter with PI's StarAlignment, or just the three integrated narrow band images?

Getting that kind of misalignment is simply impossible with our StarAlignment tool, unless the images are already strongly deformed.