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INDI Library v2.0.6 is Released (02 Feb 2024)

Bi-monthly release with minor bug fixes and improvements

Meridian Flip Configuration

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Hi Niki,
right, I am native German. But I think, for a broader audience we should stay with English.

I'll send you my email address by PN, then we could continue to talk in German :-)

- Wolfgang
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3 years 11 months ago #51334

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Any news here? IMO the issue is not caused by the meridian flip in itself. I had the same problem [1] yesterday when pointing to a new target on the other side of the meridian. The slew ended up some 50⁰ away from the intended position (and the telescope marker in the sky view was on the target I clicked on). No debug active, and the plain kstars log doesn't tell much. But something's messed up in the pointing/model system....

[1] indilib.org/forum/ekos/6671-telescope-po...s-when-flipping.html
3 years 11 months ago #51376

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No new results so far. It might be either a specific style to use Kstars/EKOS or a driver problem.
I found a strange thing in Niki‘s logs. The last slew to a target and the target the MF uses for flipping differ! This might be also the case with your situation.
Could you please elaborate what you exactly did - and post your log?

-Wolfgang
3 years 11 months ago #51390

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(side note: I just clicked 'goto editor' after having already typed a lot of text, because I wanted to attach something. All typed text was deleted. this sucks!)

It is a problem that has never occurred to me before, and except for installing current versions of everything I didn't change something, neither in setup nor in ways of using things.

As mentioned in the linked thread, I had imaged (without issues) for a few hours, all on the east hemisphere. I had started from home position, and the first goto was spot-on.
I then focused another target (on the west hemisphere), clicked 'goto target' in kstars sky view, and once it had gone there I went to align tab and went for 'slew to target'. The sky marker was on the selected target (Antennae galaxies), but solving failed. So almost identical to the reported meridian flip issues, just that it wasn't MF, but 'only' a normal goto target on the other side.
After solving failed, I recorded a frame to disk, and externally blind solved it. This succeeded, but the reported coordinates were 50 degrees off, with positive instead of negative declination values (not just a sign error, but generally on the wrong side). I think I also tried a 'load and slew' with this image, and also slewed (using kstars sky view) to a close-by bright star to see if that is in the FOV. I also stored an image there, and that also solved to a location close to the first one.
Both of those (wrong) coordinates were relatively close to the target that I had imaged in the beginning - not sure if that is by accident, or part of the issue.
But the whole pointing model of the mount was completely off after this. When I told the mount to go to home position it was pointing somewhere in the wild (photo in the mentioned thread).
Log is attached. The relevant stuff starts 2020-03-29T02:10:24.399, but as I said, no debug active, so it's not too informative other than confirming the mismatch of actual and reported coordinates...

Oh wait - I just realize that this was just after switch to summer time. But how would that lead to pointing on the wrong side of the equator!?
3 years 11 months ago #51395
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Replied by S on topic Meridian Flip Configuration

Not sure it is the same issue, but I have experienced many times that when I click go-to I kstars, the mount goes somewhere else (often close by) and the pointer in kstars does not end up where I clicked. After clicking go-to again the mount either moves almost nowhere as it is already there (but infact somewhere else close by) or it goes to the correct taget. Seems like kstars and Indi are not completely synced or something. Since it eventually works correctly after a few tries, I currently have no debug logs to post.
3 years 11 months ago #51407

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Replied by Niki on topic Meridian Flip Configuration

Universalmaster, could you verify that this happens on the Pierside east pointing west only? maybe?
Because thats exactly what happens to me.

Not able to try around because of wheather conditions atm...

greets
Niki
3 years 11 months ago #51408

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Replied by S on topic Meridian Flip Configuration

I actually can not remember, so I can neither confirm nor deny that statement :-)

I'm at summer time now, so the season may be close to over here and I'm not sure I will be able to test it further. But i has happened many times and with different version of kstars/indi. I have been using the development version the last few months, if that matters....
3 years 11 months ago #51409

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Pit, it sounds like there is a problem with the pointing model. This matches to the situation that Niki reported here .

Since the problem does not occur with my Avalon mount, it seems to be specific for some mounts.

- Wolfgang
3 years 11 months ago #51449

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In the KStars settings under Ekos -> Capture is an option "Reset Mount Model After Meridian Flip". Perhaps it helps to enable that?


Wouter
Last edit: 3 years 11 months ago by Wouter van Reeven.
3 years 11 months ago #51453

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Yes, I agree. But it definitely is a new one, I have not ever seen it last year, only now. And there had been no changes to the driver side (ieq).
I read some commit logs mentioning pier side info for mounts that don't have it native (like my CEM60). Could it be related to that, or maybe some change in an xml file that wasn't updated properly in our config directory?
I had intended to investigate this further, but they have now put our observatory in LockDown, and I no longer can access my equipment for the next 2-4 weeks :((
3 years 11 months ago #51454

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I somehow doubt it, at least in my case there was no meridian flip involved at all, it was a plain slew to target....
3 years 11 months ago #51455

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Perhas clear the mount model manually before doing the slew? Sorry, I haven't followed the whole discussion. Does this happen from the first slew on or does it start to happen after a few slews?
3 years 11 months ago #51457

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