Jean-Luc
Jean-Luc replied to the topic 'Meridian flip not happening' in the forum. 3 years ago

Hi,
Regarding the log, your mount is misaligned twenty minutes in RA. This is why the meridian flip does not occur: for the mount driver, the goto issued to perform the flip is still on the same side of the (mechanical) mount meridian.

[2021-02-28T22:48:16.902 GMT INFO ][     org.kde.kstars.ekos.mount] - Meridian flip: slewing to RA= "09h 17m 44s" DEC= " 53° 56' 07\""
[2021-02-28T22:48:16.902 GMT DEBG ][     org.kde.kstars.ekos.mount] - Setting meridian flip status to  4
[2021-02-28T22:48:16.903 GMT DEBG ][     org.kde.kstars.ekos.mount] - Slewing to RA= "09h 17m 44s" DEC= " 53° 56' 07\""
[2021-02-28T22:48:16.907 GMT DEBG ][           org.kde.kstars.indi] - ISD:Telescope sending coords RA: "09h 17m 44s" ( 9.29564 ) DE: " 53° 56' 07\"" ( 53.9353 )
[2021-02-28T22:48:16.978 GMT INFO ][           org.kde.kstars.indi] - EQMod Mount :  "[INFO] Starting Goto RA=9.29564 DE=53.9353 (current RA=9.6734 DE=52.432) "
Here the driver uses the alignment info to compute the telescope goto, the delta RA is 0.377650 hour, ~ 20 minutes.
[2021-02-28T22:48:17.002 GMT INFO ][           org.kde.kstars.indi] - EQMod Mount :  "[INFO] GOTO ALign Nearest: delta RA = 0.377650, delta DEC  = -1.503304 "
[2021-02-28T22:48:17.005 GMT INFO ][           org.kde.kstars.indi] - EQMod Mount :  "[INFO] Aligned Eqmod Goto RA=9.67329 DE=52.432 (target RA=9.29564 DE=53.9353) "
[2021-02-28T22:48:17.008 GMT INFO ][           org.kde.kstars.indi] - EQMod Mount :  "[INFO] Setting Eqmod Goto RA=9.67329 DE=52.432 (target RA=9.29564 DE=53.9353) "
This gives only 102 microsteps as the mount is still mechanically before the meridian.
[2021-02-28T22:48:17.086 GMT INFO ][           org.kde.kstars.indi] - EQMod Mount :  "[INFO] Slewing mount: RA increment = 102, DE increment = 0 "

Clients should use the true telescope coordinate to initiate a meridian flip, I believed that the PierSide property was reflecting this (i.e. was using true telescope coordinates to compute the property, not celestial coordinates).
But this may have changed.

Read More...