PCL: Comet Alignment module

[NKV]

Hi,
After processing C/2014Q2(Lovejoy) and getting the result
StarRegistredIntegration :


CometRegistredIntegration:


I found very long Comet trail in StarRegistredIntegration image and impossible to remove it completely in MixelMach via simple subtracting CometRegistredIntegration.
So, what if subtract CometRegistredIntegration from every StarRegistred, and after integrate it in to Star image without Comet?
Of course it's possible only in CometAlignment module, because we must slightly move CometRegistredIntegration according real comet position in every StarRegistred image.

I think it's good idea.

PS maybe LinearFit adaptation as option will added too, but i not sure... because ABE can do all at once via ImageContainer.

[NKV]

v.1.2.0.0001 New: Subtract Comet integration from every Targets. with LinearFit and Normalization options.
video:
Star aligned
Star aligned minus Coma Integration

Final result:

[lucchett]

Great!
Nikolay, can you help me understand better a few point of the script:

-the OBS-date is a mandatory field for the script to align the frames on the comet nucleous?

-does the script work if the images were guided on the comet nucleus? (we can set precise comet track rate, star would be a little trailed in the frames)

Thanks a lot
Andrea

PS: the script is awesome

[NKV]

Hi, Andrea.

-the OBS-date is a mandatory field for the script to align the frames on the comet nucleous?

Yes.
The module required StarAligned images with DATE-OBS in FITS Keywords.

-does the script work if the images were guided on the comet nucleus?

Yes. Just align images to stars. And after that, align comet.

PS To avoid double alignment, you can use DynamicAlignment module. Or i can write new tool... maybe in future

[cs_pixinsight]

Nikolay, I'm trying to get my head around the workflow using version 1.2.

Do I do this:
* Align light frames on the stars
* Use CometAlign on these star aligned light frames
* Integrate the comet aligned frames
* Use this "comet" Integration image and run CometAlign again, but this time using the subtract option which will remove the comet from each star aligned light frame?
* Now integrate these comet subtracted frames to get a star only Integration?
* Finally recombine the comet only and star only integrations?

Thanks, Craig

[Alejandro Tombolini]

Hi Craig. I think that is the correct procedure.
Nikolay, this is an excellent improvement, Thanksss!

Alejandro.

[NKV]

Hi Craig. I think that is the correct procedure.
Nikolay, this is an excellent improvement, Thanksss!

Yes, you are understand me perfectly.

PS next version coming. new option: subtract StarIntegratedImage from every StarRegistred and align to comet position.
I think, if StarIntegratedImage made with strong rejection and cleared from comet core manually, it's good idea!
Subtract Stars from every sources image, align to comet and integrate to OnlyCometImage.   8)

PSS released v.1.2.1.0001 Subtract StarIntegration from every target, and align result to Comet position.

[llpastro]

I am new to PixInsight and am having trouble figuring out from where to download this newer script.  The only one I found was a .rar file and I didn't know what to do with it.  I have a version of the comet alignment script but I do not know if it is the latest - I doubt it.  Any advice would be appreciated.

Larry

[NKV]

I am new to PixInsight and am having trouble figuring out from where to download this newer script.  The only one I found was a .rar file and I didn't know what to do with it.  I have a version of the comet alignment script but I do not know if it is the latest - I doubt it.  Any advice would be appreciated.

Larry

1) It's not Script. It's Module.
2) http://en.wikipedia.org/wiki/RAR
3) your OS name? If Windows x64 and latest PixInsight extract file from .rar file to PixInsight/bit folder.
4) Run PixInsight
Enjoy.

[llpastro]

NKV, thanks.  With your response I was finally able to figure it out.

Larry

[NKV]

v.1.2.2.0001 BugFix: support for Iris Software date format "DD/MM/YYYY" added.

[NKV]

CometAlignment Tutorial.

[lucchett]

Great!

Nikolay, one more question:
If I manually put the comet speed, does this "jump" the calculation based on obs-date field?
Many thanks,
Andrea

[NKV]

If I manually put the comet speed, does this "jump" the calculation based on obs-date field?

Yes, of course.
You can select where at comet in first image and set comet speed(pixels per hour). Module will calculate according obs-date the position of comet for all other images.

[lucchett]

Ok,
So in this case obs-date is used just to sequence the files?
The exact time is not used because the speed is already available.

I have some tiff files.
I converted them to fits and set a dummy obs- date in each of them, taking care of the real acquisition number.
If I put the comet rate at that time ( from Skyx), it should work, right?
Thanks again,
Andrea