Auto center after merdian flip is failing

Sequence Generator Plate Solving
1

I am using SGP 3.1.0.544 and having difficulty doing a auto-center after meridian flip. I use the ASTAP plate solver for its quick solving. I am not sure where to look as the logs says it failed right after solving with plate solver ASTAP and aborting immediately after it. Any insights would be helpful.

Pranab
Equipment: C11 Edge, 0.7x reducer, LiteCrawler, Canon 450D, QHY5L-III OAG
Target: M-31 4x3 mosaic section.

[12/19/20 19:05:36.508][DEBUG][Pier Flip Thread][SQ;MF;] Meridian Flip: Sending Telescope command to execute meridian flip
[12/19/20 19:05:36.517][DEBUG][Telescope Thread][SQ;MF;] ASCOM Telescope: Pier side is West
[12/19/20 19:05:36.517][DEBUG][Telescope Thread][SQ;MF;] ASCOM Telescope: attempting pier flip using slew
[12/19/20 19:05:36.520][DEBUG][Telescope Thread][SQ;MF;] Telescope: Slewing to J2000 RA: 0.759219465147074 (00h45m33.19s) Dec: 41.2257726471581 (41°13'32.78")
[12/19/20 19:05:36.520][DEBUG][Telescope Thread][SQ;MF;] Telescope: Slew received J2000 coordinates, mount requires JNOW, converting...
[12/19/20 19:05:36.521][DEBUG][Telescope Thread][SQ;MF;] Telescope: Slewing to JNOW RA: 0.778283608323637 Dec: 41.3421694606288
[12/19/20 19:06:26.924][DEBUG][Telescope Thread][SQ;MF;] Scope reports it is done with synchronous slew, verifying...
[12/19/20 19:06:26.925][DEBUG][Telescope Thread][SQ;MF;] Telescope: Slewing has completed
[12/19/20 19:06:26.925][DEBUG][Telescope Thread][SQ;MF;] Telescope: Settling for 5 seconds
[12/19/20 19:06:31.927][DEBUG][Telescope Thread][SQ;MF;] Telescope: Settling has completed
[12/19/20 19:06:32.928][DEBUG][Telescope Thread][SQ;MF;] Telescope thread is IDLE...
[12/19/20 19:06:32.950][DEBUG][Pier Flip Thread][SQ;MF;] Meridian Flip: Telescope command to meridian flip has completed
[12/19/20 19:06:32.951][DEBUG][Pier Flip Thread][SQ;MF;] Adjusting rotator for flip...
[12/19/20 19:06:32.951][DEBUG][Pier Flip Thread][SQ;MF;] Sequence is running, querying running target for target rotation info...
[12/19/20 19:06:32.951][DEBUG][Pier Flip Thread][SQ;MF;] Attempting to resolve camera angle...
[12/19/20 19:06:32.951][DEBUG][Pier Flip Thread][SQ;MF;] Syncing rotator to post flip sky angle: 91.3399963378906...
[12/19/20 19:06:32.951][DEBUG][Pier Flip Thread][SQ;MF;] Syncing the rotator to 91.34 degrees...
[12/19/20 19:06:33.086][DEBUG][Pier Flip Thread][SQ;MF;] ASCOM Rotator: Sync complete. Camera angle is 91.34; Reported pos rotator position: 214.60
[12/19/20 19:06:33.086][DEBUG][Pier Flip Thread][SQ;MF;] Camera already adjusted to 92, continuing...
[12/19/20 19:06:33.086][DEBUG][Pier Flip Thread][SQ;MF;] Meridian Flip: Telescope has performed meridian flip
[12/19/20 19:06:33.086][DEBUG][Pier Flip Thread][SQ;MF;] Meridian Flip: Flipping Auto Guider calibration data
[12/19/20 19:06:33.087][DEBUG][Pier Flip Thread][SQ;MF;] Sending to PHD2:
{"method": "flip_calibration", "id": 1005}

[12/19/20 19:06:33.161][DEBUG][PHD2 Listener Thread][SQ;MF;] Unknown object from PHD2: {"Event":"ConfigurationChange","Timestamp":1608433593.126,"Host":"TITAN","Inst":1}
[12/19/20 19:06:34.088][DEBUG][Pier Flip Thread][SQ;MF;] Autoguider (PHD2) successfully flipped calibration data
[12/19/20 19:06:34.088][DEBUG][Pier Flip Thread][SQ;MF;] Meridian Flip: Performing Auto Center
[12/19/20 19:06:34.088][DEBUG][Pier Flip Thread][SQ;MF;] Meridian flip reference data set to RA: 0.7549; Dec: 41.2161833333333
[12/19/20 19:06:34.122][DEBUG][Main Thread][SQ;MF;] BlockUntilEquipmentIdle: Start...
[12/19/20 19:06:34.122][DEBUG][Main Thread][SQ;MF;] BlockUntilEquipmentIdle: All threads are idle
[12/19/20 19:06:34.129][DEBUG][Telescope Thread][SQ;MF;] Center telescope message received...
[12/19/20 19:06:34.129][DEBUG][Telescope Thread][SQ;MF;CE;] Solving with Plate Solver ASTAP...
[12/19/20 19:06:34.194][DEBUG][Telescope Thread][SQ;MF;CE;] Auto center failed! Aborting auto center (c:1)...
[12/19/20 19:06:34.205][DEBUG][Telescope Thread][SQ;MF;CE;] Close centering dialog...
[12/19/20 19:06:34.205][DEBUG][Telescope Thread][SQ;MF;] Center telescope message completed...
[12/19/20 19:06:34.205][DEBUG][Telescope Thread][SQ;MF;] Telescope thread is IDLE...
[12/19/20 19:06:34.697][DEBUG][Main Thread][SQ;MF;] Centering dialog is closed...
[12/19/20 19:06:34.697][DEBUG][Main Thread][SQ;MF;] Adding sequence level notification: Auto center failed! Aborting auto center (c:1)...
[12/19/20 19:06:34.720][DEBUG][Main Thread][SQ;MF;] Sending Notification: Error - Auto center failed! Aborting auto center (c:1)...
[12/19/20 19:06:34.723][DEBUG][Pier Flip Thread][SQ;MF;] Recovery mode invoked but sequence is flagged as aborted, aborting recovery...
[12/19/20 19:06:43.396][DEBUG][Sequence Thread][SQ;] Blocking Pier Flip: Failed to meridian flip, aborting sequence (True)
[12/19/20 19:06:43.397][DEBUG][Sequence Thread][SQ;] Aborting sequence: Failed to meridian flip
[12/19/20 19:06:43.397][DEBUG][Sequence Thread][SQ;] Set sequence abort
[12/19/20 19:06:43.477][DEBUG][Pier Flip Thread][SQ;] Meridian Flip: Procedure complete
[12/19/20 19:06:43.477][DEBUG][Main Thread][SQ;] Adding sequence level notification: Failed to meridian flip, aborting sequence.
[12/19/20 19:06:43.511][DEBUG][Sequence Thread][SQ;] Sending Notification: Error - Failed to meridian flip, aborting sequence.
[12/19/20 19:06:43.511][DEBUG][Sequence Thread][SQ;] EventMarker(3) - t:M31-2 (5); e:0; f:8; o:* aborted *
[12/19/20 19:06:43.511][DEBUG][Sequence Thread][SQ;] EventMarker(10) - t:M31-2 (5); e:0; f:8; o:* aborted *
[12/19/20 19:06:43.511][DEBUG][Sequence Thread][SQ;] Set sequence abort
[12/19/20 19:06:43.519][DEBUG][Sequence Thread][SQ;] Run event requested sequence abort...
[12/19/20 19:06:43.521][DEBUG][Sequence Thread][SQ;] ********* Run post sequence *********
[12/19/20 19:06:43.521][DEBUG][Sequence Thread][SQ;] Resuming auto guiding...
[12/19/20 19:06:43.521][DEBUG][Sequence Thread][SQ;] EventMarker(170) - t:M31-2 (5); e:0; f:NA; o:* aborted *
[12/19/20 19:06:43.521][DEBUG][Sequence Thread][SQ;] Checking PHD2 state...
[12/19/20 19:06:43.521][DEBUG][Sequence Thread][SQ;] PHD2 GetPhdStatus - Pre-Wait : Stopped
[12/19/20 19:06:43.521][DEBUG][Sequence Thread][SQ;] Sending to PHD2:
{"method": "get_app_state", "id": 1001}

[12/19/20 19:06:43.622][DEBUG][Sequence Thread][SQ;] PHD2 GetPhdStatus - Post-Wait: Stopped
[12/19/20 19:06:43.622][DEBUG][Sequence Thread][SQ;] PHD2: Requested unpause, but PHD2 reports it is not in a paused state
[12/19/20 19:06:43.622][DEBUG][Sequence Thread][SQ;] EventMarker(171) - t:M31-2 (5); e:0; f:NA; o:* aborted *
[12/19/20 19:06:43.626][DEBUG][Sequence Thread][SQ;] SGPro capture cal frame mode is OFF...
[12/19/20 19:06:43.626][DEBUG][Sequence Thread][SQ;] Capture calibration frames on sequence failure is active. Abort status: True; User Abort: False
[12/19/20 19:06:43.626][DEBUG][Sequence Thread][SQ;] Turning capture cal frame mode OFF (because sequence was aborted by user) or no calibration frames exist.
[12/19/20 19:06:43.630][DEBUG][Sequence Thread][SQ;] Clearing timed monitoring events...
[12/19/20 19:06:43.631][DEBUG][Sequence Thread][SQ;] Checking RunEndOfSequenceEquipmentOptions, force = True
[12/19/20 19:06:43.631][DEBUG][Sequence Thread][SQ;] In RunEndOfSequenceEquipmentOptions
[12/19/20 19:06:43.631][DEBUG][Sequence Thread][SQ;] Stopping auto guiding...
[12/19/20 19:06:43.631][DEBUG][Sequence Thread][SQ;] Attempting to stop PHD2 guiding...
[12/19/20 19:06:43.631][DEBUG][Sequence Thread][SQ;] Checking PHD2 state...
[12/19/20 19:06:43.631][DEBUG][Sequence Thread][SQ;] PHD2 GetPhdStatus - Pre-Wait : Stopped
[12/19/20 19:06:43.631][DEBUG][Sequence Thread][SQ;] Sending to PHD2:
2

We have limited visibility on plate solve failure. That said, assuming plate solving has worked for you in situations where a flip hasn’t just completed, it is likely due to the flip introducing enough error in the mount’s position that the hints supplied to the solver are no longer close enough the actual location. This isnt terribly uncommon and can be overcome by using a blind solve backup (ANSVR) where accurate hints are not required.

https://adgsoftware.com/ansvr/

3

I have the Ansvr as the Blind solver in the configuration and have used it for a long time. Wondering why it was never invoked. I did a plate solve and found the telescope pointing somewhere else as shown in a red illustration. image

I had the mount polar aligned 2 months ago and have not moved since then.