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INDI Library v2.0.7 is Released (01 Apr 2024)

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Meridian flip still working for people?

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Replied by Bill on topic Meridian flip still working for people?

The logs will probably tell the story well. If you had a subframe that was being imaged at the time the flip was needed, that would need to finish before the flip. I tested meridian flip the other night and it worked well, although I forgot to check what Jasem was curious about.
7 years 3 weeks ago #15497

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Replied by Vincent Groenewold on topic Meridian flip still working for people?

Ah I didn't look very well, I had too many restarts so my log became a bit crowded. :) So this is what the log says;
2017-03-21T22:42:54.467 - DEBG - Capture:  "Current hour angle 0.06 hours exceeds meridian flip limit of 0 hours. Auto meridian flip is initiated."
2017-03-21T22:42:54.468 - DEBG - Guide:  "Autoguiding aborted."
2017-03-21T22:42:54.469 - DEBG - ISD:Telescope: Sending coords RA  9.96992  DEC  69.2521
2017-03-21T22:42:54.482 - DEBG - Guide: received guide frame.
2017-03-21T22:42:54.517 - DEBG - EQMod Mount :  "Starting Goto RA=9.96992 DE=69.2521 (current RA=10.0501 DE=64.6439) "
2017-03-21T22:42:54.519 - DEBG - EQMod Mount :  "GOTO ALign Nearest: delta RA = 0.080222, delta DEC  = -4.608223 "
2017-03-21T22:42:54.520 - DEBG - EQMod Mount :  "Aligned Eqmod Goto RA=10.0501 DE=64.6439 (target RA=9.96992 DE=69.2521) "
2017-03-21T22:42:54.520 - DEBG - EQMod Mount :  "Setting Eqmod Goto RA=10.0501 DE=64.6439 (target RA=9.96992 DE=69.2521) "
2017-03-21T22:42:54.521 - DEBG - WARNING: Phonon::createPath: Cannot connect  Phonon::MediaObject ( no objectName ) to  Phonon::AudioOutput ( no objectName ).
2017-03-21T22:42:54.565 - DEBG - EQMod Mount :  "Slewing mount: RA increment = 82, DE increment = 0 "
2017-03-21T22:42:56.536 - DEBG - EQMod Mount :  "Slewing to RA:  9:58:12 - DEC: 69:15:08 "
2017-03-21T22:42:56.560 - DEBG - EQMod Mount :  "Iterative Goto (1): RA diff = 0.51 arcsecs DE diff = 0.03 arcsecs "
2017-03-21T22:42:56.562 - DEBG - EQMod Mount :  "Telescope slew is complete. Tracking TRACK_SIDEREAL... "
2017-03-21T22:44:24.017 - DEBG - Capture:  "Telescope meridian flip timed out. Please make sure your mount supports meridian flip."

Which it never did before, it ofcourse does support a flip. Besides that, should the scheduler not abort in this case? My guess is that the command wasn't processed well by the mount for some reason.
Last edit: 7 years 3 weeks ago by Vincent Groenewold.
7 years 3 weeks ago #15498

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Replied by Jasem Mutlaq on topic Meridian flip still working for people?

This is why I put the HA > 0.1 just to be sure the mount is not going to ignore the command when HA = 0 exactly
7 years 3 weeks ago #15500

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Replied by Vincent Groenewold on topic Meridian flip still working for people?

Ohhh, right, I didn't know that is how it works. Why doesn't ekos not issue the command again then to be sure?
7 years 3 weeks ago #15501

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Replied by Vincent Groenewold on topic Meridian flip still working for people?

Mmm, interesting. I now tried the HA>0.1 and the mount still didn't flip, just continued imaging. Same things in the logs using an AZ-EQ6 and EQMod driver.
7 years 3 weeks ago #15659

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Replied by Jasem Mutlaq on topic Meridian flip still working for people?

I tried in simulation and it works. I will try today using my EQMod to see if there are any issues.
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7 years 3 weeks ago #15670

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Replied by Andrew on topic Meridian flip still working for people?

I had a failed meridian flip. It may have been set to >0 though.
7 years 3 weeks ago #15672

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Replied by Vincent Groenewold on topic Meridian flip still working for people?

I think it should also work at >0, but it may be the same issue. It's not that I missed a recent setting in the eqmod driver right?
7 years 3 weeks ago #15677

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Replied by Jean-Luc on topic Meridian flip still working for people?

Hi,
Concerning the log you gave above, all what I can say is:
  • you made a single point alignment, I suppose when you start your session, maybe 1h30 from the meridian, or near the pole, or else you check the Align Nearest mode
  • anyway, the delta_ra is 0.08, the meridian flip occurs at 0.06, so I think the goto, after alignment, does not perform a flip
I think that meridian flip should be initiated using true telescope coordinates, or alignment could be disabled when performing the flip.
In any case I would suggest you use more alignment points, the nearest model is quite simplistic.

Jean-Luc.
7 years 3 weeks ago #15682

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Replied by Jasem Mutlaq on topic Meridian flip still working for people?

I just finished the live testing for merdian flip and it worked fine using the Nearest Point align mode. WIth N-Star there were a few issues, not with the flip itself, but with post-flip realignment process.

How would clients know about true telescope coordinates? From Ekos, I just monitor HA and issue GOTO to the same place once HA threshold is exceeded.
7 years 3 weeks ago #15683

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Replied by Vincent Groenewold on topic Meridian flip still working for people?

I'll check what my settings are, it could ofcourse be some comms issue, though I doubt that with the Ethernet connection. Or the mount itself has a problem. Thanks for checking!
7 years 3 weeks ago #15685

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Replied by Jean-Luc on topic Meridian flip still working for people?

indi-eqmod exposes true telescope coordinates in the align tab, and maybe every mount should expose them. Ekos monitors HA using aligned coordinates, and as said above, initiates the flip when HA is 0.06 above meridian. In the log the alignment process (be it Nearest or Nstar) reports a 0.08 difference in RA, thus the goto won't perform a flip. This is a feature, not a bug. Actually you may now use the Pier Side property as defined by Patrick (which uses true coordinates in the driver directly) to initiate the flip: there you will be sure the mount would perform a flip.
The other point was tthe number of sync points: using only one sync point is not very useful. And if you make your sync near the pole, a small error here is multipled by the inverse of the sinus of the declination. I wonder if this is not why some people get scope outside limts error sometimes.
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7 years 3 weeks ago #15696

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