David's Astronomy Pages
Notes - Session 1264 Attempt 1 (2024-11-07)

 
Bullet Session Aims & Highlights
 - Observing Result
 - Night Summary Plot
 - Session Event Log
Bullet Operational Issues
  - Critical Issues (0),  Major Issues (0),  Minor Issues (2),  Small Defects (3),  Continuous Improvement (3)
Bullet No Images from Session >>            
Bullet Investigation - Dome Slewing Anomalies
   
   

Session Aims & Highlights (2024-11-07)

Main aims

  1. Targets.  Acquire images of a selection of variable stars, nearby stars, comets & deep sky targets as allowed by sky conditions.
  2. Dome Slews. Collect DeviceHub activity data to understand why dome slewing anomalies are occuring whilst dome is slaved.
  3. Crab Nebula.  Acquire 1x1 binned, 60s exposures of M1 / CM Tau to assess the needs/limitations for the Crab Nebula Pulser Project.

 Equipment & Software

Highlights

Notes

Summary Plots & Logs

Observing Plan
Image
  
Observing Result
Image
  
Night Sky Summary Plot
Top axis: Sky Brightness at Zenith (in ADU/s)
Lefthand axis: Local Time (hh LT). Righthand axis: Sun Altitude (degs)
The black 'spots on the keogram image are created by baby spiders which hatched earlier in the day (see Fig 2 & Fig 3)
Image   
  
Actual Weather vs Pre-Session Weather Forecast
Image
Image
  
Session Event Log
Time     Event Detail
19:07:52 Session Monitoring AutoStart monitoring for Live Session opportunity between 19:07 & 05:27
19:07:56   AutoStart Delayed Session delayed due to too few stars
19:12:17 Session AutoStarting Session autostarting (19:12)
19:12:38   CCDSoft Restarting CCDSoft being restarted (to set AutoSave No.)
19:13:05   Camera1 Connected SBIG Camera connected (Set point -10°C)
19:13:07 Session Created Session Created (Live, 2024-11-07 S01264, ImageSaveNum: 1264001)
19:13:11   Scope Switched On Telescope Power has been switched on via UPB Powerbox.
19:15:09   Services Started Observatory Services started
19:15:17 Observatory (Auto) Observatory placed in Fully-Automated Mode
19:15:19   AutoStart Delayed Session delayed due to too few stars
19:15:22 Session Pending Session pending (2024-11-07)
19:15:24 Session Initiating Session initiating (2024-11-07)
19:15:33   Camera1 Connected SBIG Camera connected (Set point -10°C)
19:15:40   Plan Requested Observing Plan requested from AstroPlan (1.42.4)
19:16:17   Plan Loaded Observing Plan loaded to queue (Plan ID: 1045)
19:16:57   Telescope Connected Telescope connected (TheSky6)
19:17:22 Session Equilibration Session ready to Open Dome
19:18:42   Wait On Weather Waiting for acceptable conditions
19:18:44 Session Suspending Session suspending
19:18:46   Dome Closed Dome already closed
19:18:48 Session Suspended Session suspended
19:19:14   Queue Started Observing Queue started (33 targets selected)
19:42:30     Target Cancelled Target cancelled (1/33, T CrB) due to cloud
20:02:30     Target Cancelled Target cancelled (2/33, C/2023 A3 (Tsuchinshan-ATLAS)) due to cloud
20:13:50     Target Cancelled Target cancelled (3/33, AT2024emc (CV)) due to cloud
20:26:10     Target Cancelled Target cancelled (4/33, AT2022rew (CV)) due to cloud
20:45:19 User Intervention User Intervention to abort job queue & switch back to Manual Mode
20:45:22   Queue Aborted Job Queue aborted
20:45:54       Dome Unparked Dome unparked
21:17:33     Dome Slew Dome slew held up at Az. 89.1° (Delay 31s)
21:37:05 Session Monitoring AutoStart monitoring for Live Session opportunity between 21:37 & 05:27
21:37:07 Observatory (AutoStart) Observatory placed in Auto-Start Mode
21:37:09   AutoStart Delayed Session delayed due to cloud
05:27:06   AutoStart Cancelled AutoStart cancelled (end of Time Window has been reached)
05:27:08 Observatory (Manual) Observatory placed in Manual Mode
09:07:37 User Intervention User request to close and finish session
09:07:39 Session Closing Session closing
09:07:41   Dome Closed Dome already closed
09:08:18   Dome Parked Dome parked (parking time 33s), Az: 90.1 deg
09:08:59   Telescope Parked Telescope parked (parking time 35s total)
09:09:28   Telescope State Handbox reads 'Scope parked Turn scope off.'
09:10:19   Telescope Switched Off Telescope Power has been switched off via UPB Switch.
09:11:46   Services Stopped Night Services stopped
09:11:49 Session Finishing Session Finishing started (Create Fits Summary, Transfer Files)
09:11:56     Dome (Find Park) Find Park started (Search Az 80.0 to 100.0°, Step 1.0°, Wide)
09:12:51     Dome Find Park found (Best Park Az 92.0°)
09:12:57     Dome (Find Park) Find Park started (Search Az 90.0 to 94.0°, Step 0.2°, Narrow)
09:13:39     Dome Find Park found (Best Park Az 92.2°)
09:13:44     Dome Dome has been synced at park position (Az 90.0°, Adjustment: -2.3°)
09:13:46   Dome Parked Dome parked
09:15:04   Dome Charging Dome is parked and re-charging Ok (29mA)
09:15:06 Session Finished Session Finished

 
Session Alerts & Alarms
Time     Type       Name Detail
21:17:33 Yellow Alert Dome Slew Dome slew held up at Az. 89.1° (Delay 31s)
21:25:18 Yellow Alert Anomalous Dome Slew Dome slew resumed at Az 305.9° (T+28.1s)
21:32:26 Red Alert Unexpected Scope Movement Scope appears to be tracking even though Tracking=False
05:27:06 Yellow Alert Observatory Mode Obs.Manager has put Observatory back to manual mode (end of AutoStart time window
09:15:04 Green Clear Dome Charging Dome is parked and re-charging Ok (29mA)
 

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Operational Issues (2024-11-07 S1264 Attempt 1)

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Critical Issues

Major Issues

Minor Issues

Small Defects

Continuous Improvement

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Investigation - Dome Slewing Anomalies

Issue

1) Dome Slewing Anomalies during 4 slewing operations, , dome slewing paused (S1162,  00:14, 01:33, 01:55, 03:52).

2) Dome Slewing Anomaly during 2 slewing operations, difference between Dome Az and Slave Az >1 deg (S1162  00:49, 05:52).

3) Two Anomalous Dome Slews recorded (S1264A,  21:17, 21:25)

Description

3) During Slew Testing (with Dome Shutter Closed) two yellow alerts were raised. A 'Dome Slew' alert at 21:17:33 with the message "Dome slew held up at Az. 89.1° (Delay 31s)" and 'Anomalous Dome Slew' alert at 21:25:18 with the message  "Dome slew resumed at Az 305.9° (T+28.1s)". DH Activity logging was active during both slews.

Analysis

Ideas

Conclusion

Actions:

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