David's Astronomy - Notes 2025-03-23 (S1305)

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Notes - Session 1305 (2025-03-23)

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	Session Aims & Highlights
	- Observing Result - Night Summary Plot - Session Event Log

	Operational Issues
	- Critical Issues (0), Major Issues (1), Minor Issues (1), Small Defects (1), Continuous Improvement (2)

	Images from 2025-03-23 >>

	Geomagnetic Station - Site Prep (2025-03-23 to 2025-03-25)
	Geomagnetic Station - Assembly Design (2025-03-26 to 2025-03-27)

Session Aims & Highlights (2025-03-23)

Main aims

Targets. Acquire images of a selection of variable stars, nearby stars, comets & deep sky targets as allowed by sky conditions.

Equipment & Software

12" LX200 and ST-10XME
80mm APO and ZWO ASI 178MC
TheSky6, CCDSoft5, DeviceHub 7.0.3 RC3.4694, MeadeGeneric 1.3.12.522 , UPB 1.5, Pulsar Dome Firmware 1.51 & Driver 6.3.10
Pegasus UPB & Motor Focus, TCF-S 6.0.6
SharpCap 3.2, PHD2 2.6.13, Siril 1.0.6, deCONZ 1.18.2, ASCOM 7.0.3 RC3
[ DomeLink 1.0 / 1.1 - not used ]
AstroMain 3.73.14, AstroPlan 1.43, AstroShCap 1.3.15, AstroGuard 1.10.6 (any new items or versions in bold)
AstroVOE 1.15.1, AstroSN 1.14, AstroProtect 1.10.6, AstroMove 1.15.1
AstroWeather 1.27.5, AstroAllSky 3.23.1, AstroObsCam 1.11.4 (not 1.11.5), AstroColorCam 1.2.2, AstroLaunch 1.11.14

Highlights

Targets. 15/16 planned targets observations were completed. One target UGC 5695 w/SN2025cfc failed due to user abort (through recorded as Partially Completed in Observing Plan).
Dome. There was no issues opening/closing the shutter during the session. Dome closed and parked at end of session Ok.

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
22:56:18	Session Monitoring	AutoStart monitoring for Live Session opportunity between 22:56 & 03:53
22:56:22	Session AutoStarting	Session autostarting (22:56)
22:56:45	CCDSoft Restarting	CCDSoft being restarted (to set AutoSave No.)
22:57:31	Camera1 Connected	SBIG Camera connected (Set point -25°C)
22:57:33	Session Created	Session Created (Live, 2025-03-23 S01305, ImageSaveNum: 1305001)
22:57:40	Scope Switched On	Telescope Power has been switched on via UPB Powerbox.
22:59:23	Services Started	Observatory Services started
22:59:31	Observatory (Auto)	Observatory placed in Fully-Automated Mode
22:59:35	Session Pending	Session pending (2025-03-23)
22:59:37	Session Initiating	Session initiating (2025-03-23)
22:59:46	Camera1 Connected	SBIG Camera connected (Set point -20°C)
22:59:54	Plan Requested	Observing Plan requested from AstroPlan (1.43)
23:00:35	Plan Loaded	Observing Plan loaded to queue (Plan ID: 1089)
23:01:16	Telescope Connected	Telescope connected (TheSky6)
23:01:40	Session Equilibration	Session ready to Open Dome
23:02:25	Dome Opened	Dome opened (Opening time 46s, Zigbee 41s)
23:02:55	Session Running	Session running
23:02:58	Queue Started	Observing Queue started (16 targets selected)
23:03:00	Target Started (NrZen)	Target started (Focus Field 11, HIP 53798)
23:06:48	Focusing Started-Foc1	Foc1 Focusing Started (TCF-S)
23:11:07	Focusing Completed	Foc1 AutoFocus Completed (Profile No 1, wide)
23:13:31	Focusing Completed	Foc1 AutoFocus Completed (Profile No 1)
23:13:34	Focusing Started-Foc2	Foc2 Focusing Started (Secondary Scope, using ShCap)
23:15:39	Focusing Completed	Foc2 AutoFocus Completed (Profile No 2, wide)
23:17:33	Focusing Completed	Foc2 AutoFocus Completed (Profile No 2)
23:17:52	Target Completed (NrZen)	Target completed (Focus Field 11, HIP 53798)
23:17:56	Target Started (1/16)	Target started (1/16, UGC 5695 w/SN2025cfc)
23:23:21	Pulsar Dome	Restarting Dome Controller
23:23:58	SoftSuspend Called	Soft Suspend called due to Deteriorating Conditions (low battery)
23:24:01	Pulsar Dome	Dome Controller has been restarted
23:24:08	Focusing Skipped	Foc1 focusing skipped - unable to find a star (TCF-S)
23:24:14	Pulsar Dome	Dome Service has been restarted
23:24:18	SoftSuspend Cancelled	Soft Suspend is cancelled due to improved conditions
23:24:25	Dome Unparked	Dome unparked
23:25:01	Pulsar Dome	Recovering Dome
23:25:13	Pulsar Dome	Restarting Dome Controller
23:25:48	Pulsar Dome	Dome Controller has been restarted
23:25:53	SoftSuspend Called	Soft Suspend called due to Deteriorating Conditions (low battery)
23:26:00	Pulsar Dome	Dome Service has been restarted
23:26:03	SoftSuspend Cancelled	Soft Suspend is cancelled due to improved conditions
23:26:37	Telescope Connected	Telescope connected (TheSky6)
23:27:36	User Intervention	User Intervention to abort job queue & switch back to Manual Mode
23:27:39	Target Completed	Target partially completed (1/16, UGC 5695 w/SN2025cfc)
23:27:41	Queue Aborted	Job Queue aborted
23:28:28	Services Started	Observatory Services started
23:29:38	Services Stopped	Observatory Services stopped
23:29:44	Session Closed	Session closed by User
23:29:47	Program Closed	Program closed by User
23:30:56	Program Opened	Program Opened (AstroMain 3.73.14)
23:30:58	CCDSoft Restarting	CCDSoft being restarted (to set AutoSave No.)
23:31:11	Session Resumed	Session Resumed (Live, 2025-03-23 S01305, ImageSaveNum: 1305007)
23:31:17	Obs.Overseer Started	Obs.Overseer started
23:33:00	Obs.Manager Started	Obs.Manager started
23:33:09	Services Started	Observatory Services started
23:35:15	Session Monitoring	AutoStart monitoring for Live Session opportunity between 23:35 & 03:53
23:35:17	Observatory (AutoStart)	Observatory placed in Auto-Start Mode
23:35:19	Session AutoStarting	Session autostarting (23:35)
23:35:37	Services Started	Observatory Services started
23:35:45	Observatory (Auto)	Observatory placed in Fully-Automated Mode
23:35:48	Session Pending	Session pending (2025-03-23)
23:35:50	Session Initiating	Session initiating (2025-03-23)
23:35:57	Camera1 Connected	SBIG Camera connected (Set point -20°C)
23:36:05	Plan Loaded	Observing Plan loaded to queue (Plan ID: 1089)
23:36:15	Telescope Connected	Telescope connected (TheSky6)
23:36:37	Session Running	Session running
23:36:40	Queue Started	Observing Queue started (15 targets selected)
23:38:42	Target Started (2/16)	Target started (2/16, NGC 2744 w/SN2025oq)
23:42:14	Focusing Started-Foc1	Foc1 Focusing Started (TCF-S)
23:45:10	Focusing Completed	Foc1 AutoFocus Completed (Profile No 5)
00:01:23	Target Completed	Target completed (2/16, NGC 2744 w/SN2025oq)
00:01:27	Target Started (3/16)	Target started (3/16, 29P/Schwassmann-Wachmann)
00:04:58	Focusing Started-Foc1	Foc1 Focusing Started (TCF-S)
00:07:46	Focusing Completed	Foc1 AutoFocus Completed (Profile No 6)
00:23:20	Target Completed	Target completed (3/16, 29P/Schwassmann-Wachmann)
00:23:24	Target Started (4/16)	Target started (4/16, NGC 3277 w/SN2025coe)
00:26:56	Focusing Skipped	Foc1 focusing skipped - star is lost (TCF-S)
00:43:03	Target Completed	Target completed (4/16, NGC 3277 w/SN2025coe)
00:44:36	Target Started (5/16)	Target started (5/16, AT2025euu)
00:48:12	Focusing Started-Foc1	Foc1 Focusing Started (TCF-S)
00:50:53	Focusing Completed	Foc1 AutoFocus Completed (Profile No 7)
01:07:27	Target Completed	Target completed (5/16, AT2025euu)
01:07:31	Target Started (6/16)	Target started (6/16, M63)
01:11:37	Focusing Started-Foc1	Foc1 Focusing Started (TCF-S)
01:14:07	Focusing Completed	Foc1 AutoFocus Completed (Profile No 8)
01:30:17	Target Completed	Target completed (6/16, M63)
01:30:22	Target Started (7/16)	Target started (7/16, T CrB)
01:33:57	Focusing Started-Foc1	Foc1 Focusing Started (TCF-S)
01:36:37	Focusing Completed	Foc1 AutoFocus Completed (Profile No 9)
01:41:46	Target Completed	Target completed (7/16, T CrB)
01:41:51	Target Started (8/16)	Target started (8/16, NGC 6384 w/SN2024pxl)
01:45:50	Focusing Started-Foc1	Foc1 Focusing Started (TCF-S)
01:48:45	Focusing Completed	Foc1 AutoFocus Completed (Profile No 10)
02:04:59	Target Completed	Target completed (8/16, NGC 6384 w/SN2024pxl)
02:05:03	Target Started (9/16)	Target started (9/16, AT2022uam (CV))
02:08:18	Focusing Started-Foc1	Foc1 Focusing Started (TCF-S)
02:10:50	Focusing Completed	Foc1 AutoFocus Completed (Profile No 11)
02:16:49	Target Completed	Target completed (9/16, AT2022uam (CV))
02:16:53	Target Started (10/16)	Target started (10/16, AT2025esv)
02:19:51	Focusing Started-Foc1	Foc1 Focusing Started (TCF-S)
02:22:33	Focusing Completed	Foc1 AutoFocus Completed (Profile No 12)
02:38:49	Target Completed	Target completed (10/16, AT2025esv)
02:38:53	Target Started (11/16)	Target started (11/16, AT2025oj (CV))
02:42:03	Focusing Started-Foc1	Foc1 Focusing Started (TCF-S)
02:44:56	Focusing Completed	Foc1 AutoFocus Completed (Profile No 13)
03:00:55	Target Completed	Target completed (11/16, AT2025oj (CV))
03:00:59	Target Started (12/16)	Target started (12/16, GCVS BL Lac)
03:04:12	Focusing Started-Foc1	Foc1 Focusing Started (TCF-S)
03:06:42	Focusing Completed	Foc1 AutoFocus Completed (Profile No 14)
03:11:13	Target Completed	Target completed (12/16, GCVS BL Lac)
03:11:17	Target Started (13/16)	Target started (13/16, C/2023 A3 (Tsuchinshan-ATLAS))
03:15:20	Focusing Started-Foc1	Foc1 Focusing Started (TCF-S)
03:18:24	Focusing Completed	Foc1 AutoFocus Completed (Profile No 15)
03:25:13	Target Completed	Target completed (13/16, C/2023 A3 (Tsuchinshan-ATLAS))
03:25:18	Target Started (14/16)	Target started (14/16, 2MFGC 13744 w/SN2024afyu)
03:29:29	Focusing Started-Foc1	Foc1 Focusing Started (TCF-S)
03:32:01	Focusing Completed	Foc1 AutoFocus Completed (Profile No 16)
03:48:38	Target Completed	Target completed (14/16, 2MFGC 13744 w/SN2024afyu)
03:48:42	Target Started (15/16)	Target started (15/16, UGC 10913 w/AT2025hy)
03:52:16	Focusing Started-Foc1	Foc1 Focusing Started (TCF-S)
03:54:35	Focusing Completed	Foc1 AutoFocus Completed (Profile No 17)
04:11:05	Target Completed	Target completed (15/16, UGC 10913 w/AT2025hy)
04:11:09	Target Started (16/16)	Target started (16/16, AT2025esx)
04:30:10	Target Completed	Target completed (16/16, AT2025esx)
04:30:13	Queue Completed	Job Queue completed
04:30:16	Session Closing	Session closing
04:31:11	Dome Closed	Dome closed (Closing time 50s, Zigbee 44s)
04:31:51	Dome Parked	Dome parked (parking time 33s), Az: 90.0 deg
04:32:30	Telescope Parked	Telescope parked (parking time 32s total)
04:33:00	Telescope State	Handbox reads 'Scope parked Turn scope off.'
04:33:22	Telescope Switched Off	Telescope Power has been switched off via UPB Switch.
04:34:48	Services Stopped	Night Services stopped
04:34:51	Session Finishing	Session Finishing started (Create Fits Summary, Transfer Files)
04:35:13	Dome (Find Park)	Find Park started (Search Az 88.0 to 92.0°, Step 0.2°, Narrow)
04:35:57	Dome	Find Park found (Best Park Az 90.6°)
04:36:03	Dome	Dome has been synced at park position (Az 90.0°, Adjustment: -0.6°)
04:36:05	Dome Parked	Dome parked
04:38:16	Dome Charging	Dome is parked and re-charging Ok (19mA)
04:38:19	Session Finished	Session Finished

Session Alerts & Alarms

Time	Type		Name	Detail
22:59:35	Yellow	Alert	Disk Space	Free Space on C:\ Drive (36.20 GB) is less than 50 GB
23:18:40	Yellow	Alert	Dome Discrepency	Difference between Dome Az and Telescope Az is > 8 deg (UGC 5695)
23:35:46	Yellow	Alert	Disk Space	Free Space on C:\ Drive (36.85 GB) is less than 50 GB
02:39:30	Yellow	Alert	Dome	Dome position has been static for more than 5 mins
04:35:09	Yellow	Alert	Disk Space	Free Space on C:\ Drive (37.02 GB) is less than 50 GB
04:38:17	Green	Clear	Dome Charging	Dome is parked and re-charging Ok (19mA)

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Critical Issues

None

Major Issues

Anomalies with dome connection shortly after starting session (23:03). Session commenced at 22:56 under Autostart Control, and the Dome was opened at 23:01 and the Initial Near Zenith Focusing on Focus Field 11 was successfully completed however there dome was reported to have not moved from its Park Position at Az 90, and as indicated by ObsPics. Dome was still showing as Parked on DeviceHub's Dome Tab. It is unclear if the dome did or did not physical move during this slew, but it is clear from the Focusing Operation that the Telescope View wasn't obscured by the dome roof (suggesting but not proving that the shutter aperature was in the correct position. (Pulsar Dome Log to be examined). Target 1/16 (UGC 5695 w/SN2025cfc) was started and again a dome Az discrepency was reported with the Dome still lying at Park Position (Az 90.0). Locate images were devoid of stars suggesting the telescope view was obscured. User intervention made using backdoor facilities to Restart Dome and subsequently to Recover Dome. DeviceHub was used to command an azimuthal slew to Az 200 (but there wasn't any confirmation to indicate this was successfully made. A ObsPic from 23:24:44 shows the Dome at Az 137deg, and later after the second Dome Restart, the Dome was indicated to be lying at Az 200 on ObsPic at 23:26:16. Dome was still showing with a red traffic light indicator following RecoverDome operation and it was decided to close Observatory Services , and then restart AstroMain & restart the session. Upon restarting the session and reperforming AutoStart the Dome behaviour was normal. Resolved in-session by user. Issue is ranked high as it may have caused multiple failed targets if operating fully autonomously without user monitoring & intervention. Review suggests there Pulsar Dome was operating correctly, and that there issue seems to be that either AstroMain didn't send a Dome.Slaving=True message to DeviceHub (although SlavingOn - Green in ObsPic) or it did but DeviceHub didn't perform the necessary slaving calculation. Timeline (see FIg 1) shows AstroMain did turnon Dome Slaving at the time of the Initial Telescope Slew to Focus Field 11 but DeviceHub didn't perform Dome Slaving and/or didn't command Dome to Slew. User Intervention was successful but RecoverDome was required and AstroMain restart was required. What should AstroMain ObsOverseer/ObsManager done to correct the situation itself ?
Resolved in-session by user 2025-03-23 (Dome, DeviceHub, AstroMain)

Minor Issues

Disk space warnings are being raised on the Observatory Computer (22:59 - 04:35). Yellow Disk Space' alerts have been during current and past few session. The alert message "Free Space on C:\ Drive (37.02 GB) is less than 50 GB" was reported at the end of the S1305 session. Resolved by moving ASCOM Logs from 2024, to the external drive attached to the Observatory Computer, releasing 39.5 GB. Data/folders not longer required were deleted releasing 40.6 GB
Old ObsPics (2.0 GB)
Old Target Database backups (7.7 GB).
Old Virtual Greenhouse Charts (1.7 GB).
Old General Session Folders (28.6 GB)
Old SavedSession (Live) Folders (0.6 GB)
As a result of actions the free space on Observatory Computer's C Drive is now 116 GB. (the Free Space on External E: Drive is now 127 GB)
Fixed 2025-03-24 (AstroMain)

Small Defects

Target 1/16 (UGC 5695 w/SN2025cfc) inappropriately recorded as Partially Completed. Target 1/16 (UGC 5695 w/SN2025cfc) was recorded as being partially completed (yellow) in the Observing Plan with the report message "Target finished (0 / 5 frames completed)". The target was correctly not recorded in the Session Result. Target should have been recorded as Failed in the Observing Plan, as no images were acquired.
To fix 2025-03-24+ (AstroMain)

Continuous Improvement

Further extend AstroMove's 'Copy Aurora Files' facility to copy a selected time interval. AstroMove1.15 implemented a new feature on 2025-03-22 to copy relevant files from AllSky/Weather Computer across to the Development/Analysis Computer. However it copies entire folder contents when sometime it is only necessary to copy image files from a user-specified time range, perhaps only 1-3 hours long. This is particularly relevant for copying Tapo North Cam images as source folder contains 24 hours worth of data with a 15s cadence (i.e. some 5760 jpg images). Also a text box to define new Folder Suffix (default = "Aurora") to allow a different folder to be used , e.g. "SpaceX Rocket".
Done 2025-03-27 (AstroMove 1.15.2)
Review ObsOverseer/ObsManager's identification & response to Dome Slaving anomaly. DeviceHub appears not to have performed dome slaving calculations after AstroMain turned on Dome Slaving upon initial telescope slew to Near Zenith Focus Field at the start of Session S1305 (see Major Issue above). This ticket should review the actions of SlewMonitor, ObsOverseer & ObsManager in regard to self identification of a problem and the remedial actions it should have taken.
To do 2025-03-24+ (AstroMain)

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Fig 1. Timeline associated with Slaved Dome Anomaly at start of session

P   23:01:40.475 Dome Commands: OpenShutter: (slew started)

P   23:01:40.475 OpenShutter Request sent

P   23:01:40.475 ShutterStatus 2
P   23:01:40.475 Dome Statuses: Get ShutterStatus: shutterOpening

P   23:02:23.264 ShutterStatus 0

CL 23:03:09.16 | Focus Field 11                         Call    Scope.SlewToRaDec   Ok      | Calling TheSky6.Telescope.SlewToRaDec
C1 23:03:09.553 Get Slaved: False (done)
C1 23:03:09.553 Set Slaved: Setting Slaved to True(Enable slaving for ASCOM.Pulsar_Observatories_Dome.Dome) (done)
CL 23:03:09.55 | Focus Field 11                         Set     Dome.Slaving(On)    Info    | Set Dome Slaving ON
C1 23:03:10.425 Get Slaved: True (done)
DH 23:03:10.969 Telescope Commands: SlewToCoordinatesAsync - RA = 11:01:29.3, Dec 50:54:03: (slew started)

DH 23:18:05.789 Telescope Commands: SlewToCoordinatesAsync - RA = 10:30:59.5, Dec 13:01:49: (slew started)

DH 23:18:06.525 Telescope Statuses: Get Slewing: True
DH 23:18:32.090 Telescope Statuses: PollScopeTask - Cancelling slew in progress state
DH 23:18:33.530 Telescope Statuses: Get Slewing: False

C1 23:23:20.473 Get Slaved: True (done)
DH 23:21:52.162 Dome Commands: OpenShutter: (slew started)
P    23:21:52.162 OpenShutter Request sent

P    23:24:22.611 SlewToAzimuth Start 200

P    23:24:22.617 Slewing Get False (Meaning True)

P    23:24:23.552 Azimuth Get Azimuth = 90
P    23:24:23.552 AtPark Get AtPark = True

P    23:24:24.476 Azimuth Get Azimuth = 91.7
P    23:24:24.477 AtPark Get AtPark = False

P    23:25:06.155 Azimuth Get Azimuth = 185.2
- Dome Restarted

P    23:25:48.884 CommandString RX 200.0
P    23:25:50.465 Azimuth Get Azimuth = 200

C1    23:38:50.471 Set Slaved: Setting Slaved to True(Enable slaving for ASCOM.Pulsar_Observatories_Dome.Dome) (done)

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Geomagnetic Station - Site Prep (2025-03-23 to 2025-03-25)

A Geomagnetic Monitoring Station is being added to the Observatory in Spring 2025 for monitoring changes in the earth's magnetic field and to supplement and build upon the Observatory's existing Aurora monitoring that use a Black/White AllSky Camera and new NorthCam Colour Camera.

The following notes describe the Site Preparation Phase

Other Notes :
| Review | SAM III | Site Prep | Assembly Design | Parts Assembly | Testing | Final Assembly | Installation | Commissioning | Remedial Work |

Hole Digging (2025-03-23)

Hole that will contain the 3-axis geomagnetometer sensor fixture has been commenced on 2025-03-21 and reached 45 cm depth. Pictures below show status of hole on 2025-03-23 after reaching 68cm.

Hole that will eventually contain
3-axis geomagnetometer sensor fixture
Hole has reached 68cm deep at the time of the photo
another 52cm to go in red subsoil / drift deposit Hole location relative to Observatory
where the SAM III Monitor will reside
Offset Distance 10m
Cables will eventually be run below the lawn.

Hole Digging (2025-03-24)

Hole that will contain the 3-axis geomagnetometer sensor fixture has now reached 100cm depth. Another 20cm to go

Hole Completion (2025-03-25)

Hole that will contain the 3-axis geomagnetometer sensor fixture has been completed after reaching 120cm depth.

Completed Hole for the 3-axis geomagnetometer sensor fixture Hole depth is 120cm		Detailed image showing lower part of hole


Side view of hole 120cm depth		Side view of hole 120cm depth.

Geomagnetic Station - Assembly Design (2025-03-26 to 2025-03-27)

A Geomagnetic Monitoring Station is being added to the Observatory in Spring 2025 for monitoring changes in the earth's magnetic field and to supplement and build upon the Observatory's existing Aurora monitoring that use a Black/White AllSky Camera and new NorthCam Colour Camera.

The following notes describe the Assembly Design & Parts.

Other Notes :
| Review | SAM III | Site Prep | Assembly Design | Parts Assembly | Testing | Final Assembly | Installation | Commissioning | Remedial Work |

Pipe work for the building the fixture that will house the 3-axis geomagnetometer sensors & the temperature sensor were purchased today (2025-03-26) from a local hardware shop. Items comprised FloPlast 40/43 mm diameter straight pipe, angled junctions, connectors and end stops. Junctions will eventually be joined/sealed using special FloPlast solvent cement.

A mock-up of the fixture showing the rough positions of sensors is shown in the picture below. Note that the straight pipe has not been cut to size yet, and the top horizontal sensors will be placed at 90 deg to each other in the final build (not the 180 deg positioning used in the rough mock-up). Cables to the magnetometer sensors aren't shown here,but the Temperature Sensor & its cable are.

Update 2025-03-27 (Sensor Fixture Progress)

Pipe work for the building the buried sensor fixture has been cut to length and the entire assembly loosely fitted together (see pictures below) :

3 x 15m lengths of CAT6 Cable have been cut from 100m reel previously purchased.

The required cable length is around 12.5m, so these 15m lengths have an excess which will be trimmed off during the final tieback to the Observatory.

This Web Page:	Notes - Session 1305 (2025-03-23)
Last Updated :	2025-04-27
Site Owner :	David Richards
Home Page :	David's Astronomy Web Site

Hole that will eventually contain 3-axis geomagnetometer sensor fixture Hole has reached 68cm deep at the time of the photo another 52cm to go in red subsoil / drift deposit		Hole location relative to Observatory where the SAM III Monitor will reside Offset Distance 10m Cables will eventually be run below the lawn.

David's Astronomy Pages Notes - Session 1305 (2025-03-23)

Session Aims & Highlights (2025-03-23)

Operational Issues (2025-03-23, S1305)

Geomagnetic Station - Site Prep (2025-03-23 to 2025-03-25)

Geomagnetic Station - Assembly Design (2025-03-26 to 2025-03-27)

David's Astronomy Pages
Notes - Session 1305 (2025-03-23)