David's Astronomy Pages Notes - Session 890 (2021-04-24)

Notes (S889)

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Notes (S890)

	2021-04-24 (Session 890)
	Session Aims & Highlights
	- Observing Result  - Night Summary Plot  - Session Event Log
	Operational Issues
	- Critical Issues (0),  Major Issues (0),  Minor Issues (4),  Continuous Improvement (0)
	Images from 2021-04-24 >>      [ Local Files >> ]
	Investigation - Slewing Scope Path Resolution

Session Aims & Highlights (2021-04-24)

Main aims

1. Resync Telescope. Resync LX200 main scope and carry out new short mapping run in order tie scope back into TPoint Model
   (RA and Dec Clutches released during testing over past few days,meaning that Scope Pointing was up to 2-3 degrees off position)
2. MeadeGeneric. Test out Meade Generic Driver 1.0.1.327  with fixes for AutoSet Time, Slewing Property and blanking driver properties.
3. Targets. Acquire images of a selection of variable stars, nearby stars, comets & deep sky targets as allowed by conditions

Equipment & Software

• 12" LX200 and ST-10XME
• 80mm APO and ZWO ASI 178MC
• CCDApp2, TheSky6, CCDSoft5, PHD2,  DeviceHub 4.5.1,  MeadeGeneric 1.0.0.327, UPB 1.5, ASCOM 6.5 SP1
• Pegasus UPB & Motor Focus, TCF-S
• SharpCap 3.2, PHD2  2.6.9Dev4
   
• AstroMain 3.39.2,  AstroPlan 1.21.6,  AstroShCap 1.3.11, AstroGuard 1.6,   AstroVOE 1.7, AstroSN 1.5,  AstroProtect 1.6
  (AstroWeather 1.12.4, AstroAllSky 3.10.3, AstroObsCam 1.5.5 )

Highlights

•   MeadeGeneric.  Meade Generic Driver was used in live session for third time. Crtical bugs and issues have been fixed in the 1.0.1.327 build used

Lowlights

•   Sky Quality.  Sky Transparency was particularly poor. Few visible stars. Sky background light high due to high clouds and bright moon.

Notes:

Summary Plots & Logs

Observing Plan

Observing Result

Dome & Scope Slewing Performance

Slew/Centering Performance

Guiding Performance

Sky Conditions (Locate Frames)

Night Sky Summary Plot Top axis: Sky Brightness at Zenith (in ADU/s) Lefthand axis: Local Time (hh LT). Righthand axis: Sun Altitude (degs)

Actual Weather vs Pre-Session Weather Forecast

Session Event Log

Time     Event Detail 22:31:52 Session Created Live Session Created (2021-04-24 S00890, ImageSaveNum: 890001) 22:31:53 Program Resumed AstroMain UI resumed again at 22:31 after 10s 22:33:31   Scope Switched On Telescope Power has been switched on via UPB Powerbox. 22:34:46   Services Started Observatory Services started 22:35:12   Telescope Connected Telescope Connected (TheSky6) 22:35:40   Camera1 Connected SBIG Camera Connected (set point -20°C) 22:36:44   Dome Opened Dome opened (opening time 45s) 22:42:49   Services Stopped Observatory Services stopped 22:42:57   Obs.Manager Started Obs.Manager started 22:42:59   Obs.Overseer Started Obs.Overseer started 22:43:03   Services Started Observatory Services started 22:43:15   Telescope Switched Off Telescope Power has been switched off via UPB Switch. 22:43:47   Services Stopped Observatory Services stopped 22:43:49 Program Closed Program closed by User 22:43:51 Program Closed Program closed by User 22:46:12 Session Resumed Live Session Resumed (2021-04-24 S00890, ImageSaveNum: 890001) 22:46:48   Scope Switched On Telescope Power has been switched on via UPB Powerbox. 22:48:03   Obs.Manager Started Obs.Manager started 22:48:05   Obs.Overseer Started Obs.Overseer started 22:48:09   Services Started Observatory Services started 22:48:23   Telescope Connected Telescope Connected (TheSky6) 22:51:16   Camera1 Connected SBIG Camera Connected (set point -20°C) 00:01:14   Services Started Observatory Services started 00:01:39 Observatory (Auto) Observatory placed in Fully-Automated Mode 00:01:42 Session Pending Session pending (2021-04-24) 00:01:44 Session Initiating Session initiating (2021-04-24) 00:01:46   Plan Requested Observing Plan requested from AstroPlan (1.21.6) 00:03:11   Plan Loaded Observing Plan loaded to queue (, Plan ID: 629) 00:03:19   Camera1 Connected SBIG Camera Connected (set point -20°C) 00:03:23   Telescope Connected Telescope Connected (TheSky6) 00:03:38 Session Equilibration Session ready for dome & camera equilibration 00:03:40 Session Running Session running 00:03:42   Queue Started Observing Queue started (17 targets selected) 00:04:44       Focusing Started-Foc1 Foc1 Focusing Started (TCF-S) 00:06:35       Focusing Completed Foc1 AutoFocus Completed (Profile No 1) 00:06:38     Target Started (1/17) Target started (1/17, AT2021hkn) 00:12:32       Focusing Started-Foc1 Foc1 Focusing Started (TCF-S) 00:14:21       Focusing Completed Foc1 AutoFocus Completed (Profile No 2) 00:20:20     Target Completed Target completed (1/17, AT2021hkn) 00:20:22     Target Started (2/17) Target started (2/17, KUG 1206+328 w/SN2020aeps) 00:25:51       Focusing Skipped Foc1 focusing skipped - star is lost (TCF-S) 00:38:26     Target Completed Target completed (2/17, KUG 1206+328 w/SN2020aeps) 00:38:28     Target Started (3/17) Target started (3/17, NGC 4227 w/SN2021biz) 00:42:49       Focusing Started-Foc1 Foc1 Focusing Started (TCF-S) 00:45:03       Focusing Completed Foc1 AutoFocus Completed (Profile No 3) 01:01:08     Target Completed Target completed (3/17, NGC 4227 w/SN2021biz) 01:01:11     Target Started (4/17) Target started (4/17, IC 992 w/SN2021dwg) 01:04:54       Focusing Skipped Foc1 focusing skipped - star is lost (TCF-S) 01:22:15     Target Completed Target completed (4/17, IC 992 w/SN2021dwg) 01:22:17     Target Started (5/17) Target started (5/17, Nova Per 2020 (CV)) 01:26:39       Focusing Started-Foc1 Foc1 Focusing Started (TCF-S) 01:28:40       Focusing Completed Foc1 AutoFocus Completed (Profile No 4) 01:37:17     Target Completed Target completed (5/17, Nova Per 2020 (CV)) 01:37:19     Target Started (6/17) Target started (6/17, NGC 3310 w/SN2021gmj) 01:41:47       Focusing Started-Foc1 Foc1 Focusing Started (TCF-S) 01:44:20       Focusing Completed Foc1 AutoFocus Completed (Profile No 5) 01:56:49     Target Completed Target partially completed (6/17, NGC 3310 w/SN2021gmj) 01:56:51     Target Started (7/17) Target started (7/17, UGC 6930 w/SN2020rcq) 02:00:41       Focusing Started-Foc1 Foc1 Focusing Started (TCF-S) 02:03:06       Focusing Completed Foc1 AutoFocus Completed (Profile No 6) 02:13:37 Critical Humidity Alert Critical Humidity Alert (Obs.Manager will close the Shutter) 02:13:39   HardSuspend Called Hard Suspend is called due to Critical Conditions (high humidity) 02:13:42     Target Aborted (7/17) Target aborted (7/17, UGC 6930 w/SN2020rcq) due to high humidity 02:13:45   Queue Paused Queue paused For Session Suspension 02:13:47 Session Suspended Session suspended 02:14:37   Dome Closed Dome closed (closing time 50s) 02:25:13 Session Resuming Session resuming 02:25:58   Dome Opened Dome opened (opening time 45s) 02:26:00 Session Running Session running 02:26:02   Queue Resumed Observing Queue resumed 02:28:08 Critical Humidity Alert Critical Humidity Alert (Obs.Manager will close the Shutter) 02:28:10   HardSuspend Called Hard Suspend is called due to Critical Conditions (high humidity) 02:29:26     Target Aborted (8/17) Target aborted (8/17, C/2020 T2 (Palomar)) due to high humidity 02:29:28   Queue Paused Queue paused For Session Suspension 02:29:30 Session Suspended Session suspended 02:30:18   Dome Closed Dome closed (closing time 50s) 02:39:21     Target Cancelled Target cancelled (9/17, WDS GRB 34) due to high humidity 02:45:55 Session Resuming Session resuming 02:46:40   Dome Opened Dome opened (opening time 45s) 02:46:42 Session Running Session running 02:46:44   Queue Resumed Observing Queue resumed 02:47:28       Focusing Started-Foc1 Foc1 Focusing Started (TCF-S) 02:47:30 Critical Humidity Alert Critical Humidity Alert (Obs.Manager will close the Shutter) 02:47:32   HardSuspend Called Hard Suspend is called due to Critical Conditions (high humidity) 02:47:48       Focusing Aborted Foc1 Focusing Aborted due to HardSuspend 02:47:50     Target Aborted (10/17) Target aborted (10/17, HIP 87937) due to high humidity 02:47:52   Queue Paused Queue paused For Session Suspension 02:47:54 Session Suspended Session suspended 02:48:40   Dome Closed Dome closed (closing time 50s) 02:55:36 Session Resuming Session resuming 02:56:21   Dome Opened Dome opened (opening time 45s) 02:56:23 Session Running Session running 02:56:25   Queue Resumed Observing Queue resumed 02:57:04       Focusing Started-Foc1 Foc1 Focusing Started (TCF-S) 02:57:46 Critical Humidity Alert Critical Humidity Alert (Obs.Manager will close the Shutter) 02:57:48   HardSuspend Called Hard Suspend is called due to Critical Conditions (high humidity) 02:57:53       Focusing Aborted Foc1 Focusing Aborted due to HardSuspend 02:57:55     Target Aborted (11/17) Target aborted (11/17, GCVS AM Her) due to high humidity 02:57:57   Queue Paused Queue paused For Session Suspension 02:57:59 Session Suspended Session suspended 02:58:46   Dome Closed Dome closed (closing time 50s) 03:00:01 Session Resuming Session resuming 03:00:46   Dome Opened Dome opened (opening time 45s) 03:00:48 Session Running Session running 03:00:50   Queue Resumed Observing Queue resumed 03:01:30       Focusing Started-Foc1 Foc1 Focusing Started (TCF-S) 03:03:24       Focusing Completed Foc1 AutoFocus Completed (Profile No 9) 03:03:26     Target Started (12/17) Target started (12/17, GCVS CY Lyr) 03:12:49     Target Completed Target completed (12/17, GCVS CY Lyr) 03:12:51     Target Started (13/17) Target started (13/17, GCVS CI Cyg) 03:15:49       Focusing Started-Foc1 Foc1 Focusing Started (TCF-S) 03:17:39       Focusing Completed Foc1 AutoFocus Completed (Profile No 10) 03:21:14     Target Completed Target completed (13/17, GCVS CI Cyg) 03:21:16     Target Started (14/17) Target started (14/17, 61 Cyg) 03:25:22       Focusing Started-Foc1 Foc1 Focusing Started (TCF-S) 03:27:10       Focusing Completed Foc1 AutoFocus Completed (Profile No 11) 03:28:45     Target Completed Target completed (14/17, 61 Cyg) 03:28:48     Target Started (15/17) Target started (15/17, GCVS HH And) 03:32:53       Focusing Started-Foc1 Foc1 Focusing Started (TCF-S) 03:35:06       Focusing Completed Foc1 AutoFocus Completed (Profile No 12) 03:37:05     Target Completed Target completed (15/17, GCVS HH And) 03:37:08     Target Started (16/17) Target started (16/17, GCVS BL Lac) 03:41:15       Focusing Started-Foc1 Foc1 Focusing Started (TCF-S) 03:43:09       Focusing Completed Foc1 AutoFocus Completed (Profile No 13) 03:46:46     Target Completed Target completed (16/17, GCVS BL Lac) 03:46:48     Target Started (17/17) Target started (17/17, GCVS EV Lac) 03:49:45       Focusing Started-Foc1 Foc1 Focusing Started (TCF-S) 03:51:53       Focusing Completed Foc1 AutoFocus Completed (Profile No 14) 03:54:19     Target Completed Target completed (17/17, GCVS EV Lac) 03:54:22   Queue Completed Job Queue completed 03:54:26 Session Closing Session closing 03:55:21   Dome Closed Dome closed (closing time 50s) 03:55:43   Dome Parked Dome parked (parking time 15s), Az: 90.0 deg 03:57:04   Telescope Parked Telescope parked (parking time 75s) 03:57:34   Telescope Switched Off Telescope Power has been switched off via UPB Switch. 03:58:23   Services Stopped Night Services stopped 03:58:25 Session Housekeeping Housekeeping Started (Cleanup FITS, Create Fits Summary, Transfer Files) 03:58:41 Session Finished Session Finished

Session Alerts

Time     Alert Detail -- No Alerts                --

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Operational Issues (2021-04-24, S890)

• Critical Issues (0)
• Major Issues (0)
• Minor Issues (5)
• Continuous Improvement (0)

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Critical Issues - None

Major Issues - None

Minor Issues

• Slew Paths on Slewing Chart are poorly resolved.  Path appears like set of straight line segments rather than a more finely defined curve. Scope paths were arguably better resolved wiith the MeadeLX200GPS driver than the MeadeGeneric driver.
  To be fixed (MeadeGeneric)
   
• Scope slewing times seemed particularly long for first two targets. Scope slewing times Target 1 (AT2021hkn, 151s) and Target 2 (KUG 1206+328, 118s)  seemed particularly long. Slew angles (165.6 and 197.8 deg respectively) were quite large however
  To be fixed (MeadeGeneric)
   
• Best Focus Chart started later than other charts. Chart started at 23:30 even though other charts started at 22:00. AstroMain program wasn't restarted  ruling out 'restart' as a factor in the problem
  To be fixed (AstroMain 3.39.3)
   
• Unable to move telescope to SCOPE_PARK position (Az180, Alt 1) using TheSky6.   Scope wouldn't move to location or it would move to an apparent position with  altitude  4-5 degs. Finally decided on moving scope to Az 180, Alt 3 degs and Set Park Position at thi sposition using Autostar Handbox.
  To be resolved (AstroMain 3.39.3) / TheSky6 )
   
• At end of Mapping Run and scope moves back to starting point the slaved dome speed is reported at 11.1 deg/min (4.6deg / 25s), speed should be reported in deg/sec.
  To be fixed (AstroMain 3.39.3)

Continuous Improvement

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Investigation - Slewing Scope Path Resolution

Issue : Scope paths during slews in S890 session using the MeadeGeneric (1.0.1.327)  telescope driver are less well resolved than scope paths in earlier sessions using the MeadeLX200GPS driver.

Description :

• PIcture below shows the scope slewing path in S890 session using MeadeGeneric (1.0.1.327) telescope driver (right-hand graph)
   
  
   
   
• Picture below shows the scope slewing path from an earlier sssion uisng the MeadeLX200GPS telescope driver (right-hand graph)
   
  
  
  
• Slewing charts from both session was created in AstroMain using data passed on by DeviceHub.Telescope, with DH fast polling rate of 0.5s and an AstroMain poll rate of 0.2s.
  
•  Scope Paths are less smooth on first chart (using MeadeGeneric driver) compared to the second chart (using MeadeLX200GPS driver)
  

Analysis:

• Examining the opening slew from near the Park Position to the Near Zenith Focus Point from the two sessions
  
• Scope slewing path (00:03) collected in S890 session (using MeadeGeneric (1.0.1.327) driver)
  
  Path for the 80 deg slew is defined by 16 unique Az/Alt points. 

  00:03:42.92 | Az: 181.43, Alt:   3.20,  Slewing: 0,  Slew:   0.000, Time:    0.1
  00:03:45.05 | Az: 181.44, Alt:   3.20,  Slewing: 1,  Slew:   0.004, Time:    2.2
  00:03:47.11 | Az: 181.44, Alt:   3.20,  Slewing: 1,  Slew:   0.004, Time:    4.3 Angular Change:   0.00 (Static)
  00:03:47.32 | Az: 181.44, Alt:   3.20,  Slewing: 1,  Slew:   0.004, Time:    4.5 Angular Change:   0.00 (Static)
  00:03:47.52 | Az: 181.44, Alt:   3.20,  Slewing: 1,  Slew:   0.004, Time:    4.7 Angular Change:   0.00 (Static)
  00:03:47.72 | Az: 181.44, Alt:   3.20,  Slewing: 1,  Slew:   0.004, Time:    4.9 Angular Change:   0.00 (Static)
  00:03:47.92 | Az: 181.44, Alt:   3.20,  Slewing: 1,  Slew:   0.004, Time:    5.1 Angular Change:   0.00 (Static)
  00:03:48.13 | Az: 181.44, Alt:   3.20,  Slewing: 1,  Slew:   0.004, Time:    5.3 Angular Change:   0.00 (Static)
  00:03:48.33 | Az: 181.44, Alt:   3.20,  Slewing: 1,  Slew:   0.004, Time:    5.5 Angular Change:   0.00 (Static)
  00:03:48.53 | Az: 181.44, Alt:   3.20,  Slewing: 1,  Slew:   0.004, Time:    5.7 Angular Change:   0.00 (Static)
  00:03:48.74 | Az: 181.44, Alt:   3.20,  Slewing: 1,  Slew:   0.004, Time:    5.9 Angular Change:   0.00 (Static)
  00:03:48.94 | Az: 181.44, Alt:   3.20,  Slewing: 1,  Slew:   0.004, Time:    6.1 Angular Change:   0.00 (Static)
  00:03:49.14 | Az: 181.44, Alt:   3.20,  Slewing: 1,  Slew:   0.004, Time:    6.3 Angular Change:   0.00 (Static)
  00:03:49.34 | Az: 181.44, Alt:   6.84,  Slewing: 1,  Slew:   0.004, Time:    6.5 Angular Change:   0.00 (Static)
  00:03:49.55 | Az: 181.27, Alt:   6.84,  Slewing: 1,  Slew:   8.669, Time:    6.7
  00:03:51.17 | Az: 181.31, Alt:  11.86,  Slewing: 1,  Slew:  18.798, Time:    8.3
  00:03:51.98 | Az: 181.48, Alt:  27.25,  Slewing: 1,  Slew:  29.025, Time:    9.1
  00:03:54.01 | Az: 181.48, Alt:  27.25,  Slewing: 1,  Slew:  29.025, Time:   11.2 Angular Change:   0.00 (Static)
  00:03:54.21 | Az: 181.48, Alt:  27.25,  Slewing: 1,  Slew:  29.025, Time:   11.4 Angular Change:   0.00 (Static)
  00:03:54.41 | Az: 181.77, Alt:  41.80,  Slewing: 1,  Slew:  38.608, Time:   11.6
  00:03:56.61 | Az: 181.77, Alt:  41.80,  Slewing: 1,  Slew:  38.608, Time:   13.8 Angular Change:   0.00 (Static)
  00:03:56.82 | Az: 182.06, Alt:  52.00,  Slewing: 1,  Slew:  53.808, Time:   14.0
  00:03:58.84 | Az: 182.06, Alt:  52.00,  Slewing: 1,  Slew:  53.808, Time:   16.0 Angular Change:   0.00 (Static)
  00:03:59.05 | Az: 182.88, Alt:  62.05,  Slewing: 1,  Slew:  63.888, Time:   16.2
  00:04:01.08 | Az: 182.88, Alt:  62.05,  Slewing: 1,  Slew:  63.888, Time:   18.2 Angular Change:   0.00 (Static)
  00:04:01.28 | Az: 182.88, Alt:  62.05,  Slewing: 1,  Slew:  63.888, Time:   18.4 Angular Change:   0.00 (Static)
  00:04:01.48 | Az: 183.94, Alt:  76.88,  Slewing: 1,  Slew:  73.703, Time:   18.6
  00:04:03.51 | Az: 183.94, Alt:  76.88,  Slewing: 1,  Slew:  73.703, Time:   20.7 Angular Change:   0.00 (Static)
  00:04:03.71 | Az: 183.94, Alt:  76.88,  Slewing: 1,  Slew:  73.703, Time:   20.9 Angular Change:   0.00 (Static)
  00:04:03.91 | Az: 183.94, Alt:  76.88,  Slewing: 1,  Slew:  73.703, Time:   21.1 Angular Change:   0.00 (Static)
  00:04:04.12 | Az: 183.94, Alt:  76.88,  Slewing: 1,  Slew:  73.703, Time:   21.3 Angular Change:   0.00 (Static)
  00:04:04.32 | Az: 183.94, Alt:  76.88,  Slewing: 1,  Slew:  73.703, Time:   21.5 Angular Change:   0.00 (Static)
  00:04:04.52 | Az: 186.71, Alt:  82.61,  Slewing: 1,  Slew:  80.072, Time:   21.7
  00:04:06.55 | Az: 186.71, Alt:  82.61,  Slewing: 1,  Slew:  80.072, Time:   23.7 Angular Change:   0.00 (Static)
  00:04:06.75 | Az: 186.71, Alt:  82.61,  Slewing: 1,  Slew:  80.072, Time:   23.9 Angular Change:   0.00 (Static)
  00:04:06.96 | Az: 186.71, Alt:  82.61,  Slewing: 1,  Slew:  80.072, Time:   24.1 Angular Change:   0.00 (Static)
  00:04:07.16 | Az: 187.80, Alt:  83.20,  Slewing: 1,  Slew:  80.178, Time:   24.3
  00:04:09.19 | Az: 187.80, Alt:  83.20,  Slewing: 1,  Slew:  80.178, Time:   26.3 Angular Change:   0.00 (Static)
  00:04:09.39 | Az: 187.69, Alt:  83.38,  Slewing: 1,  Slew:  80.264, Time:   26.5
  00:04:11.47 | Az: 187.69, Alt:  83.38,  Slewing: 1,  Slew:  80.264, Time:   28.6 Angular Change:   0.00 (Static)
  00:04:11.67 | Az: 187.28, Alt:  83.38,  Slewing: 1,  Slew:  80.320, Time:   28.8
  00:04:13.70 | Az: 187.28, Alt:  83.38,  Slewing: 1,  Slew:  80.320, Time:   30.8 Angular Change:   0.00 (Static)
  00:04:13.90 | Az: 187.28, Alt:  83.38,  Slewing: 1,  Slew:  80.320, Time:   31.0 Angular Change:   0.00 (Static)
  00:04:14.10 | Az: 187.28, Alt:  83.38,  Slewing: 1,  Slew:  80.320, Time:   31.2 Angular Change:   0.00 (Static)
  00:04:14.30 | Az: 187.69, Alt:  83.38,  Slewing: 1,  Slew:  80.365, Time:   31.4
  00:04:15.93 | Az: 187.78, Alt:  83.38,  Slewing: 1,  Slew:  80.369, Time:   33.1
  00:04:17.97 | Az: 187.78, Alt:  83.38,  Slewing: 1,  Slew:  80.375, Time:   35.1
  00:04:18.01 | Total: 80.375,  Direct: 80.602
  00:04:18.01 | Scope Slew Time=  35.1s

• Scope slewing path (21:40) collected in S885 session (using  MeadeLX200GPS driver )
  
  Path for 81 deg slew is defined by 25 unique Az/Alt points. 

  21:40:21.58 | Az: 180.42, Alt:   1.76,  Slew:   0.000, Time:    0.3
  21:40:23.31 | Az: 180.42, Alt:   1.76,  Slew:   0.000, Time:    2.1 Angular Change:   0.00 (Static)
  21:40:23.51 | Az: 180.42, Alt:   1.76,  Slew:   0.000, Time:    2.3 Angular Change:   0.00 (Static)
  21:40:23.72 | Az: 180.42, Alt:   1.76,  Slew:   0.000, Time:    2.5 Angular Change:   0.00 (Static)
  21:40:23.92 | Az: 180.42, Alt:   1.76,  Slew:   0.000, Time:    2.7 Angular Change:   0.00 (Static)
  21:40:24.12 | Az: 180.42, Alt:   1.76,  Slew:   0.000, Time:    2.9 Angular Change:   0.00 (Static)
  21:40:24.32 | Az: 180.42, Alt:   1.76,  Slew:   0.000, Time:    3.1 Angular Change:   0.00 (Static)
  21:40:24.53 | Az: 180.42, Alt:   1.76,  Slew:   0.000, Time:    3.3 Angular Change:   0.00 (Static)
  21:40:24.73 | Az: 180.42, Alt:   1.76,  Slew:   0.000, Time:    3.5 Angular Change:   0.00 (Static)
  21:40:24.93 | Az: 180.43, Alt:   4.51,  Slew:   2.764, Time:    3.7
  21:40:26.15 | Az: 180.37, Alt:   9.55,  Slew:   7.824, Time:    4.9
  21:40:27.57 | Az: 180.27, Alt:  14.55,  Slew:  17.775, Time:    6.3
  21:40:28.79 | Az: 180.29, Alt:  24.44,  Slew:  22.770, Time:    7.6
  21:40:30.21 | Az: 180.31, Alt:  29.46,  Slew:  27.804, Time:    9.0
  21:40:31.64 | Az: 180.33, Alt:  34.36,  Slew:  37.731, Time:   10.4
  21:40:33.06 | Az: 180.37, Alt:  44.38,  Slew:  42.781, Time:   11.8
  21:40:34.28 | Az: 180.40, Alt:  49.34,  Slew:  52.523, Time:   13.0
  21:40:35.70 | Az: 180.43, Alt:  54.08,  Slew:  57.697, Time:   14.5
  21:40:37.04 | Az: 180.53, Alt:  64.24,  Slew:  62.720, Time:   15.8
  21:40:38.25 | Az: 180.61, Alt:  69.16,  Slew:  72.455, Time:   17.0
  21:40:39.67 | Az: 180.73, Alt:  73.94,  Slew:  76.738, Time:   18.4
  21:40:41.09 | Az: 181.21, Alt:  81.57,  Slew:  80.119, Time:   19.9
  21:40:42.51 | Az: 181.33, Alt:  82.45,  Slew:  80.991, Time:   21.3
  21:40:43.93 | Az: 181.35, Alt:  82.63,  Slew:  81.003, Time:   22.7
  21:40:45.15 | Az: 181.35, Alt:  82.59,  Slew:  81.071, Time:   23.9
  21:40:46.37 | Az: 181.34, Alt:  82.57,  Slew:  81.085, Time:   25.1
  21:40:47.58 | Az: 181.34, Alt:  82.55,  Slew:  81.163, Time:   26.3
  21:40:48.80 | Az: 181.35, Alt:  82.54,  Slew:  81.196, Time:   27.6
  21:40:50.42 | Az: 181.89, Alt:  82.54,  Slew:  81.219, Time:   29.2
  21:40:51.44 | Az: 181.99, Alt:  82.54,  Slew:  81.235, Time:   30.2
  21:40:52.65 | Az: 182.04, Alt:  82.53,  Slew:  81.244, Time:   31.4
  21:40:53.67 | Az: 182.04, Alt:  82.53,  Slew:  81.247, Time:   32.4
  21:40:55.30 | Az: 182.05, Alt:  82.53,  Slew:  81.250, Time:   34.1
  21:40:55.32 | Total: 81.250,  Direct: 81.307

• The slew using the MeadeGeneric driver has fewer unique points (just 16 points) than the equivalent slew using the MeadeLX200GPS driver (25 points).
  
  Average time interval between unique Az/Alt coordinates is 2.19s with MeadeGeneric driver. This compares with an average time interval of 1.32s using the MeadeLX200GPS driver.
  
  (Note: earlier time data is limited in both datasets due to a delay in the DeviceHub switching between slow polling and fast polling rate. This is will be fixed in a future DeviceHub version)
  
• The log file for slew using the MeadeGeneric driver has  ' Angular Change: 0.00 (Static)' lines beyond the initial 'static phase' (related to DH poll rate issue), whilst the log file for slew using MeadeLX200GPS driver doesn't contain this later 'Static' lines.  This potentially relates to differences between frequency at which Ra/Dec coordinates are updated by driver compared to update rate for Az/Alt coordinates, and the method used for reporting the scope path.
   
• Examining the Meade.Generic.Telescope trace file for the period of the slew we see the polling cycles as illustrated below:

  00:03:50.129 RightAscension            Get - 13:03:16 convert to 13.0544444444444 13:03:16
  00:03:50.519 Declination               Get - -05[DF]25:07 convert to -5.41861111111111 -05:25:07"
  00:03:50.519 Altitude                  27.2527125979371
  00:03:50.893 RightAscension            Get - 13:03:16 convert to 13.0544444444444 13:03:16
  00:03:50.956 Declination               Get - -05[DF]32:15 convert to -5.5375 -05:32:15"
  00:03:50.971 Azimuth Get               181.479382801732
  00:03:51.455 Declination               Get - -00[DF]27:19 convert to -0.455277777777778 -00:27:19"
  00:03:51.595 RightAscension            Get - 13:03:16 convert to 13.0544444444444 13:03:16
  
  00:03:53.015 RightAscension            Get - 13:03:37 convert to 13.0602777777778 13:03:37
  00:03:53.171 Declination               Get - +09[DF]07:39 convert to 9.1275 09:07:39"
  00:03:53.171 Altitude                  41.7984043866063
  00:03:53.436 RightAscension            Get - 13:03:16 convert to 13.0544444444444 13:03:16
  00:03:53.842 Declination               Get - +09[DF]13:13 convert to 9.22027777777778 09:13:13"
  00:03:53.857 Azimuth Get               181.77059038713
  00:03:53.998 Declination               Get - +09[DF]07:39 convert to 9.1275 09:07:39"
  00:03:54.060 RightAscension            Get - 13:03:16 convert to 13.0544444444444 13:03:16
  
  00:03:55.402 RightAscension            Get - 13:03:39 convert to 13.0608333333333 13:03:39
  00:03:55.573 Declination               Get - +19[DF]20:04 convert to 19.3344444444444 19:20:04"
  00:03:55.573 Altitude                  52.0037541326065
  00:03:55.839 RightAscension            Get - 13:03:16 convert to 13.0544444444444 13:03:16
  00:03:56.213 Declination               Get - +19[DF]24:20 convert to 19.4055555555556 19:24:20"
  00:03:56.213 Azimuth Get               182.062013116076
  00:03:56.338 Declination               Get - +24[DF]19:39 convert to 24.3275 24:19:39"
  00:03:56.431 RightAscension            Get - 13:03:16 convert to 13.0544444444444 13:03:16
  
  00:03:57.726 RightAscension            Get - 13:03:41 convert to 13.0613888888889 13:03:41
  00:03:57.867 Declination               Get - +29[DF]23:04 convert to 29.3844444444444 29:23:04"
  00:03:57.882 Altitude                  62.0513578377384
  00:03:58.132 RightAscension            Get - 13:03:16 convert to 13.0544444444444 13:03:16
  00:03:58.506 Declination               Get - +34[DF]26:36 convert to 34.4433333333333 34:26:36"
  00:03:58.522 Azimuth Get               182.875705484168
  00:03:58.647 Declination               Get - +34[DF]24:26 convert to 34.4072222222222 34:24:26"
  00:03:58.740 RightAscension            Get - 13:03:16 convert to 13.0544444444444 13:03:16
  
  00:04:00.066 RightAscension            Get - 13:03:44 convert to 13.0622222222222 13:03:44
  00:04:00.222 Declination               Get - +44[DF]13:22 convert to 44.2227777777778 44:13:22"
  00:04:00.238 Altitude                  76.8803054432494
  00:04:00.846 RightAscension            Get - 13:03:44 convert to 13.0622222222222 13:03:44
  00:04:01.002 Declination               Get - +44[DF]13:22 convert to 44.2227777777778 44:13:22"
  00:04:01.018 Azimuth Get               183.942346515119
  00:04:01.080 Declination               Get - +44[DF]13:22 convert to 44.2227777777778 44:13:22"
  
  00:04:01.127 RightAscension            Get - 13:03:16 convert to 13.0544444444444 13:03:16
  00:04:02.578 Declination               Get - +49[DF]57:50 convert to 49.9638888888889 49:57:50"
  00:04:02.593 Altitude                  82.6076716503026
  00:04:03.280 RightAscension            Get - 13:03:47 convert to 13.0630555555556 13:03:47
  00:04:03.405 Declination               Get - +50[DF]35:25 convert to 50.5902777777778 50:35:25"
  00:04:03.420 Azimuth Get               186.714082904078
  00:04:03.685 Declination               Get - +50[DF]35:25 convert to 50.5902777777778 50:35:25"
  00:04:04.060 RightAscension            Get - 13:03:48 convert to 13.0633333333333 13:03:48
  
  00:04:05.557 RightAscension            Get - 13:03:49 convert to 13.0636111111111 13:03:49
  00:04:05.713 Declination               Get - +50[DF]33:31 convert to 50.5586111111111 50:33:31"
  00:04:05.729 Altitude                  83.1996867784703
  00:04:05.979 RightAscension            Get - 13:03:16 convert to 13.0544444444444 13:03:16
  00:04:06.353 Declination               Get - +50[DF]55:35 convert to 50.9263888888889 50:55:35"
  00:04:06.369 Azimuth Get               187.803883904551
  00:04:06.603 Declination               Get - +50[DF]39:15 convert to 50.6541666666667 50:39:15"
  00:04:06.618 Connected                 Get True
  00:04:06.759 RightAscension            Get - 13:03:16 convert to 13.0544444444444 13:03:16
  
  00:04:08.069 RightAscension            Get - 13:03:52 convert to 13.0644444444444 13:03:52
  00:04:08.131 Declination               Get - +50[DF]44:28 convert to 50.7411111111111 50:44:28"
  00:04:08.131 Altitude                  83.3815270154921
  00:04:08.490 RightAscension            Get - 13:03:16 convert to 13.0544444444444 13:03:16
  00:04:08.584 Declination               Get - +50[DF]44:28 convert to 50.7411111111111 50:44:28"
  00:04:08.584 Azimuth Get               187.685444374654
  00:04:08.677 Declination               Get - +50[DF]44:28 convert to 50.7411111111111 50:44:28"
  00:04:08.677 Connected                 Get True
  00:04:08.755 RightAscension            Get - 13:03:16 convert to 13.0544444444444 13:03:16
  
  00:04:10.315 RightAscension            Get - 13:03:51 convert to 13.0641666666667 13:03:51
  00:04:10.487 Declination               Get - +50[DF]44:39 convert to 50.7441666666667 50:44:39"
  00:04:10.487 Altitude                  83.3834844826595
  00:04:11.111 RightAscension            Get - 13:03:36 convert to 13.06 13:03:36
  00:04:11.267 Declination               Get - +50[DF]44:39 convert to 50.7441666666667 50:44:39"
  00:04:11.267 Azimuth Get               187.279675757447
  00:04:11.314 Declination               Get - +50[DF]44:39 convert to 50.7441666666667 50:44:39"
  00:04:11.376 RightAscension            Get - 13:03:37 convert to 13.0602777777778 13:03:37
  
  00:04:12.671 RightAscension            Get - 13:03:26 convert to 13.0572222222222 13:03:26
  00:04:12.827 Declination               Get - +50[DF]44:39 convert to 50.7441666666667 50:44:39"
  00:04:12.843 Altitude                  83.3758216697213
  00:04:13.513 RightAscension            Get - 13:03:21 convert to 13.0558333333333 13:03:21
  00:04:13.669 Azimuth Get               187.688776817491
  00:04:13.841 Declination               Get - +50[DF]44:39 convert to 50.7441666666667 50:44:39"
  00:04:13.919 RightAscension            Get - 13:03:20 convert to 13.0555555555556 13:03:20
  
  00:04:15.198 RightAscension            Get - 13:03:19 convert to 13.0552777777778 13:03:19
  00:04:15.229 Declination               Get - +50[DF]44:52 convert to 50.7477777777778 50:44:52"
  00:04:15.245 Altitude                  83.3767099656825
  00:04:15.448 RightAscension            Get - 13:03:19 convert to 13.0552777777778 13:03:19
  00:04:15.479 Declination               Get - +50[DF]44:52 convert to 50.7477777777778 50:44:52"
  00:04:15.479 Azimuth Get               187.783304272384
  00:04:15.573 RightAscension            Get - 13:03:19 convert to 13.0552777777778 13:03:19

• Observations are :
  
  1) average time interval between successive RA/Dec points is 0.78s (some are around 0.27s others around 0.84, others around 1.31s)
  
  2) average time interval between RA reads and the corresponding DEC reads is normally 0.10s (but not all RA read have an obvious matching Dec read)
  
  3) average time interval between successive Altitude/Azmiuth points is 2.48s (range 2.31 to  3.14s)
  
     Recommendation : Altitude/Azimuth reads should be made at the fast polling rate during slews in order to try the achieve the most accurate Az/Alt path
  
  4) average time interval between Altitude reads and the corresponding Azimuth reads is 0.70s  (range 0.23 to 0.83s)
  
     Recommendation : Azimuth reads should be made directly after Altitude reads in order to try the achieve the most accurate Az/Alt path ) 
  
  
• Nornal cycle (when not slewing) looks like this
  
  

  01:06:26.530 SiteLongitude Get         -02[B0] 00' 32"
  01:06:26.561 SiteLatitude Get          57[B0] 19' 10"
  01:06:26.561 AtPark                    Get - False
  01:06:26.936 RightAscension            Get - 14:19:13 convert to 14.3202777777778 14:19:13
  01:06:26.936 AtPark                    Get - False
  01:06:27.029 Declination               Get - +00[DF]36:26 convert to 0.607222222222222 00:36:26"
  01:06:27.029 Altitude                  33.25308176631
  01:06:27.029 Connected                 Get True
  01:06:27.045 AtHome                    Get - False
  01:06:27.045 Connected                 Get True
  01:06:27.045 AtPark                    Get - False
  01:06:27.045 Connected                 Get True
  01:06:27.061 IsSlewingToTarget         IsSlewing = False : result = 
  01:06:27.061 AtPark                    Get - False
  01:06:27.061 UTCDate                   Get started
  01:06:27.154 UTCDate                   Get - 04-25-21 00:06:22
  

  01:06:27.185 SiteLongitude Get         -02[B0] 00' 32"
  01:06:27.232 SiteLatitude Get          57[B0] 19' 10"
  01:06:27.232 AtPark                    Get - False
  01:06:27.279 RightAscension            Get - 14:19:13 convert to 14.3202777777778 14:19:13
  01:06:27.279 AtPark                    Get - False
  01:06:27.310 Declination               Get - +00[DF]36:26 convert to 0.607222222222222 00:36:26"
  01:06:27.310 Azimuth Get               177.037398715254
  01:06:27.310 Connected                 Get True
  01:06:27.310 Connected                 Get True
  01:06:27.310 AtPark                    Get - False
  01:06:27.341 RightAscension            Get - 14:19:13 convert to 14.3202777777778 14:19:13
  01:06:27.341 AtPark                    Get - False
  01:06:27.373 Declination               Get - +00[DF]36:26 convert to 0.607222222222222 00:36:26"
  01:06:27.373 Connected                 Get True
  01:06:27.373 DeclinationRate           Get - 0
  01:06:27.373 Connected                 Get True
  01:06:27.373 IsPulseGuiding Get        pulse guiding is synchronous for this driver
  01:06:27.373 Connected                 Get True
  01:06:27.373 AtPark                    Get - False
  01:06:27.747 Declination               Get - +00[DF]36:22 convert to 0.606111111111111 00:36:22"
  01:06:27.747 PulseGuide                Using new pulse guiding technique
  01:06:27.778 RightAscension            Get - 14:19:12 convert to 14.32 14:19:12
  01:06:27.794 Connected                 Get True
  01:06:27.794 RightAscensionRate        Get - 0
  01:06:27.794 Connected                 Get True
  01:06:27.794 SideOfPier Get            Not implemented
  01:06:27.794 Connected                 Get True
  01:06:27.856 AtPark                    Get - False
  

  01:06:27.872 SiteLongitude Get         -02[B0] 00' 32"
  01:06:27.872 SiderealTime              Get - 14.1893042388873
  01:06:27.872 Connected                 Get True
  01:06:27.872 Connected                 Get True
  01:06:27.872 GetSlewing                Result = False
  01:06:27.872 Slewing                   Result = False
  01:06:27.872 Connected                 Get True
  01:06:27.872 TargetDeclination Get     0.608344444444444
  01:06:27.872 Connected                 Get True
  01:06:27.872 TargetRightAscension Get  14.3191305555556
  01:06:27.872 Connected                 Get True
  01:06:27.872 Tracking                  Get - True
  01:06:27.872 Connected                 Get True
  01:06:27.872 TrackingRate Get          driveSidereal
  01:06:27.872 Connected                 Get True
  01:06:27.887 UTCDate                   Get started
  01:06:27.965 RightAscension            Get - 14:19:12 convert to 14.32 14:19:12
  01:06:27.965 AtPark                    Get - False
  01:06:28.121 UTCDate                   Get - 04-25-21 00:06:23
  01:06:28.168 Declination               Get - +00[DF]36:22 convert to 0.606111111111111 00:36:22"
  01:06:28.168 PulseGuide                Complete Before RA: 14:19:13 Dec:00[B0] 36' 22"
  01:06:28.168 PulseGuide                Complete After RA: 14:19:12 Dec:00[B0] 36' 22"
  01:06:28.168 IsPulseGuiding Get        pulse guiding is synchronous for this driver
  01:06:31.132 Connected                 Get True
  01:06:31.132 Connected                 Get True
  01:06:31.132 UTCDate                   Get started
  01:06:31.226 UTCDate                   Get - 04-25-21 00:06:26

  01:06:31.273 SiteLongitude Get         -02[B0] 00' 32"
  01:06:31.319 SiteLatitude Get          57[B0] 19' 10"
  01:06:31.319 AtPark                    Get - False
  01:06:31.709 RightAscension            Get - 14:19:11 convert to 14.3197222222222 14:19:11
  01:06:31.709 AtPark                    Get - False
  01:06:31.741 Declination               Get - +00[DF]36:22 convert to 0.606111111111111 00:36:22"
  01:06:31.741 Altitude                  33.2527831974678
  01:06:31.756 Connected                 Get True
  01:06:31.756 AtHome                    Get - False
  01:06:31.756 Connected                 Get True
  01:06:31.756 AtPark                    Get - False
  01:06:31.756 Connected                 Get True
  01:06:31.756 UTCDate                   Get started
  01:06:31.787 Connected                 Get True
  01:06:31.787 PulseGuide                pulse guide direction guideWest duration 37
  01:06:31.787 AtPark                    Get - False
  01:06:31.865 UTCDate                   Get - 04-25-21 00:06:26
  01:06:31.897 SiteLongitude Get         -02[B0] 00' 32"
  01:06:31.928 SiteLatitude Get          57[B0] 19' 10"

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