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INDI Library v1.8.1 Released (09 Sep 2019)

Monthly maintenance release INDI v1.8.1

Polemaster in KStars

2 years 10 months ago
giorgio_ne
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Polemaster in KStars #13254
I don't know if this has been asked before but I would love to see in KStars a feature to polar align the mount by imaging the celestial pole region. Exactly what the QHY Polemaster does. There's a GitHub project that has some code in Python, could this be embedded in KStars?

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2 years 10 months ago 2 years 10 months ago by Vox45.
Vox45
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Polemaster in KStars #13255
+1

This feature now exists in Sharpcap 2.9 (Windows) where you do not need to buy a dedicated camera and an adapter to attach the camera to the PA scope, you use a either a guide scope with its camera attached or the main camera on the OTA. From what I read, it is working well and the precision is on par with polemaster or other methods.

I would also like to see this in INDI.

"Some people are so poor, all they have is money"
SW Black Diamond 80ED | SW150MAK | Newton SW 200/1000 | Orion 50mm Guider with Helical Focuser |Sirius EQ-G Rowan Belt Mode
Canon 1000D moded | ZWO ASI185MC | Baader Mark III Zoom
INDI | Stellarmate on RPI3B+ | Stellarium | Pixinsight

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2 years 10 months ago
sebiseb
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Polemaster in KStars #13296
I vote for this also.
Polermaster and similar polar alginment method been discussed 3 mounth ago in this topic : indilib.org/forum/general/1456-a-complet...for-polar-align.html

Sebastien

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2 years 10 months ago
Pepe.Lombris
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Polemaster in KStars #13828
Hi,

having a pole alignment routine similiar to Polemaster would be great! Works like a charme in Sharpcap 2.9.

Clear skies!
Stephan

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2 years 10 months ago
knro
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Polemaster in KStars #13830
Can someone write a detailed description of how it works? It captures around polaris then asks you to adjust Alt/Az knobs until you center crosshair into some spot? If this is how it works, then it's mostly done in Ekos by "Correct Alt" and "Correct Az" buttons after you calculate the errors. But I guess it could be more user-friendly. Anyway, write a complete description please.

Jasem Mutlaq
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2 years 10 months ago
Pepe.Lombris
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Polemaster in KStars #13833
Hi!

I think this paper gives a decent summary:

www.syracuse-astro.org/pdf/2012_August_R..._Alignment_Scope.pdf

CS
Stephan
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2 years 10 months ago
Pepe.Lombris
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Polemaster in KStars #13834
there is also a git hub project ( github.com/ThemosTsikas/PhotoPolarAlign ) which refers to yet another paper:

www.considine.net/aplanatic/align.htm

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2 years 10 months ago
sebiseb
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Polemaster in KStars #13845
Hi Jasem,

you may find several videos on youtube descripe the QHY Polemaster procedure. This one is particulary intersting:


An advantage I see in such method is that it allows you to align the mount without the need to load it with the whole equipments. Indeed, mount like the EQ6 are _very_ difficult to adjust in ALT once loaded with the OTA and the counter wheights.

Sebastien

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2 years 9 months ago
knro
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Polemaster in KStars #13859
Thanks. I'll add this to my TODO list. Will announce when it is ready for testing.

Jasem Mutlaq
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2 years 9 months ago
knro
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Polemaster in KStars #14155
So some update on this. All the methods assume a fairly wide FOV. In my setup, I have less than 1x1 degrees with main camera and even less on guide cam. Here are some issues:

1. Small FOV? Sometimes even the NCP is not in the image (in my case at edge on parking)
2. Southern hemisphere?
3. Astrometry fails close to celestial poles. Maybe large FOV resolves this?
4. Possible to do astrometry father away from poles, but even then, WCS info would be unreliable this close to the poles.

So how to proceed with this? It's possible to continue using the existing method which is slower than Polemaster but it works on each axis independently. FITS View is now embedded in Align module so it is possible to show visual cues on how to move and adjust without leaving the screen. If there is a method that can work with all the limitations above, please let me know.

Jasem Mutlaq
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2 years 9 months ago
knro
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Polemaster in KStars #14162
So it appears most problem are related to FOV issues. I'll try to see if I can solve today with ASI120M on Orion 50m guide scope.

Jasem Mutlaq
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2 years 9 months ago
Pepe.Lombris
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Polemaster in KStars #14163
Hi,
the windows software sharpcap 2.9 implements the polar alignment routine. The author mentions that it works best with a finder scope of about 200mm. It seems that his software is not perfectly working at other focal length. I think he mentioned that somewhere in a forum posts ... which I can't find right now.

Maybe this helps:
www.sharpcap.co.uk/sharpcap/polar-alignment

I have seen many posts that report arc minute polar alignment using a simple viewfinder within a couple of minutes.

Best wishes
Stephan

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