David's Astronomy Pages Notes - Session 1090 (2023-01-25)

Notes (S1089A)

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Notes (S1091)

	Session Aims & Highlights
	- Observing Result  - Night Summary Plot  - Session Event Log
	Operational Issues
	- Critical Issues (0),  Major Issues (0),  Minor Issues (4)  Small Defects (2),  Continuous Improvement (3)
	Images from 2023-01-25 >>

Session Aims & Highlights (2023-01-25)

Main aims

1. Targets.  Acquire images of a selection of variable stars, nearby stars, comets & deep sky targets as allowed by sky conditions.
2. AstroMain. Check new 3.60.11 version of AstroMain for any issues introduced by recent bug fixes and small improvements

 Equipment & Software

• 12" LX200 and ST-10XME
• 80mm APO and ZWO ASI 178MC
• CCDApp2, TheSky6, CCDSoft5, DeviceHub 6.6.1.1,  MeadeGeneric 1.3.5.414, UPB 1.5, ASCOM 6.6
• Pegasus UPB & Motor Focus, TCF-S
• SharpCap 3.2, PHD2  2.6.11dev2, deCONZ 1.18.2, ASCOM 6.6 SP1
   
• AstroMain 3.60.11, AstroPlan 1.35.11,   AstroShCap 1.3.12, AstroGuard 1.10.2
  AstroVOE 1.12.2  AstroSN 1.9,  AstroProtect 1.7,  AstroMove 1.9.8
  (AstroWeather 1.19.9, AstroAllSky 3.17.3,  AstroObsCam 1.11.2, AstroLaunch 1.10.7

Highlights

• Targets. Only 4 targets out of 36 planned targets were completed with an additional 5 targets partially completed. Other targets weren't acquired due to cloud, or weren't attempted due to the session being terminated early due to expected continuation of cloud with rain showers
• AstroMain. There were no new issues introduced by the new AstroMain version (3.60.11)
• Dome Slews. No dome slews were affectced by holdups (Hold Up Stats: 0/13 slews affected, 0%, 0.2 minutes total hold-up time).

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 17:59:26 Session Monitoring AutoStart monitoring for Live Session opportunity between 17:59 & 06:12 18:00:02 Session AutoStarting Session autostarting (18:00) 18:00:22   CCDSoft Restarting CCDSoft being restarted (to set AutoSave No.) 18:00:47   Camera1 Connected SBIG Camera connected (set point -10°C) 18:00:49 Session Created Session Created (Live, 2023-01-25 S01090, ImageSaveNum: 1090001) 18:01:14   Scope Switched On Telescope Power has been switched on via UPB Powerbox. 18:02:57   Services Started Observatory Services started 18:03:04 Observatory (Auto) Observatory placed in Fully-Automated Mode 18:03:07 Session Pending Session pending (2023-01-25) 18:03:09 Session Initiating Session initiating (2023-01-25) 18:03:11   Plan Requested Observing Plan requested from AstroPlan (1.35.11) 18:04:25   Plan Loaded Observing Plan loaded to queue (Plan ID: 863) 18:04:38   Camera1 Connected SBIG Camera connected (set point -20°C) 18:05:14   Telescope Connected Telescope connected (TheSky6) 18:05:38 Session Equilibration Session ready to Open Dome 18:06:23   Dome Opened Dome opened (opening time 45s) 18:06:25 Session Running Session running 18:06:28   Queue Started Observing Queue started (36 targets selected) 18:06:29     Target Started (NrZen) Target started (Focus Field 3, HIP 14181) 18:11:32       Focusing Started-Foc1 Foc1 Focusing Started (TCF-S) 18:14:06       Focusing Completed Foc1 AutoFocus Completed (Profile No 1, wide) 18:16:02       Focusing Completed Foc1 AutoFocus Completed (Profile No 1) 18:16:04       Focusing Started-Foc2 Foc2 Focusing Started (Secondary Scope, using ShCap) 18:18:13       Focusing Completed Foc2 AutoFocus Completed (Profile No 2, wide) 18:19:57       Focusing Completed Foc2 AutoFocus Completed (Profile No 2) 18:20:15     Target Completed (NrZen) Target completed (Focus Field 3, HIP 14181) 18:20:19     Target Started (1/36) Target started (1/36, IC 1705 w/SN2023fa) 18:23:54       Focusing Skipped Foc1 focusing skipped - star is lost (TCF-S) 18:40:24     Target Completed Target completed (1/36, IC 1705 w/SN2023fa) 18:41:59     Target Started (2/36) Target started (2/36, M33 w/Nova M33 2022-11a?) 18:45:51       Focusing Skipped Foc1 focusing skipped - star is too dim (TCF-S) 19:01:49     Target Completed Target completed (2/36, M33 w/Nova M33 2022-11a?) 19:04:19     Target Started (3/36) Target started (3/36, IC 1756 w/SN2023Q) 19:06:04       SoftSuspend Called Soft Suspend is called due to Deteriorating Conditions (too few stars) 19:07:28     Target Failed (3/36) Target failed due to cloud (3/36, IC 1756 w/SN2023Q) 19:07:30   Queue Paused Queue paused for Session Suspension 19:07:32 Session Suspending Session suspending 19:08:20   Dome Closed Dome closed (closing time 50s) 19:08:22 Session Suspended Session suspended 19:23:35     Target Cancelled Target cancelled (3/36, IC 1756 w/SN2023Q) due to cloud 19:30:12 Session Resuming Session resuming 19:30:57   Dome Opened Dome opened (opening time 45s) 19:30:59 Session Running Session running 19:31:01   Queue Resumed Observing Queue resumed 19:31:03     Target Started (4/36) Target started (4/36, IC 1874 w/SN2023fu) 19:41:03       SoftSuspend Called Soft Suspend is called due to Deteriorating Conditions (too few stars) 19:42:33   Critical Cloud Alert Critical Cloud Alert (Obs.Manager will close the Dome) 19:42:35   HardSuspend Called Hard Suspend is called due to Critical Conditions (cloud) 19:42:36     Target Aborted (4/36) Target aborted (4/36, IC 1874 w/SN2023fu) due to cloud 19:42:38   Queue Paused Queue paused for Session Suspension 19:42:40 Session Suspending Session suspending 19:43:23   Dome Closed Dome closed (closing time 45s) 19:43:25 Session Suspended Session suspended 19:45:55     Target Cancelled Target cancelled (4/36, IC 1874 w/SN2023fu) due to cloud 19:51:54 Session Resuming Session resuming 19:52:39   Dome Opened Dome opened (opening time 45s) 19:52:41 Session Running Session running 19:52:43   Queue Resumed Observing Queue resumed 19:52:46     Target Started (5/36) Target started (5/36, NGC 1300 w/SN2022acko) 20:01:20       SoftSuspend Called Soft Suspend is called due to Deteriorating Conditions (too few stars) 20:02:10   Critical Cloud Alert Critical Cloud Alert (Obs.Manager will close the Dome) 20:02:12   HardSuspend Called Hard Suspend is called due to Critical Conditions (cloud) 20:02:15     Target Aborted (5/36) Target aborted (5/36, NGC 1300 w/SN2022acko) due to cloud 20:02:17   Queue Paused Queue paused for Session Suspension 20:02:19 Session Suspending Session suspending 20:03:05   Dome Closed Dome closed (closing time 50s) 20:03:07 Session Suspended Session suspended 20:08:15     Target Cancelled Target cancelled (5/36, NGC 1300 w/SN2022acko) due to cloud 20:10:06 Session Resuming Session resuming 20:10:51   Dome Opened Dome opened (opening time 45s) 20:10:53 Session Running Session running 20:10:55   Queue Resumed Observing Queue resumed 20:11:19     Target Started (6/36) Target started (6/36, NGC 1363 w/SN2022ackv) 20:16:47       Focusing Started-Foc1 Foc1 Focusing Started (TCF-S) 20:18:58       Focusing Completed Foc1 AutoFocus Completed (Profile No 3) 20:29:33       SoftSuspend Called Soft Suspend is called due to Deteriorating Conditions (reducing clarity) 20:29:48   Critical Cloud Alert Critical Cloud Alert (Obs.Manager will close the Dome) 20:29:50   HardSuspend Called Hard Suspend is called due to Critical Conditions (cloud) 20:29:52     Target Aborted (6/36) Target aborted (6/36, NGC 1363 w/SN2022ackv) due to cloud 20:29:54   Queue Paused Queue paused for Session Suspension 20:29:56 Session Suspending Session suspending 20:30:43   Dome Closed Dome closed (closing time 50s) 20:30:45 Session Suspended Session suspended 20:39:29 Session Resuming Session resuming 20:40:14   Dome Opened Dome opened (opening time 45s) 20:40:16 Session Running Session running 20:40:18   Queue Resumed Observing Queue resumed 20:40:19     Target Started (7/36) Target started (7/36, UGC 3044 w/SN2023cf) 20:55:45   Critical Cloud Alert Critical Cloud Alert (Obs.Manager will close the Dome) 20:55:47   HardSuspend Called Hard Suspend is called due to Critical Conditions (cloud) 20:55:50     Target Aborted (7/36) Target aborted (7/36, UGC 3044 w/SN2023cf) due to cloud 20:55:52   Queue Paused Queue paused for Session Suspension 20:55:54 Session Suspending Session suspending 20:56:40   Dome Closed Dome closed (closing time 50s) 20:56:43 Session Suspended Session suspended 21:00:56 Session Resuming Session resuming 21:01:41   Dome Opened Dome opened (opening time 45s) 21:01:43 Session Running Session running 21:01:45   Queue Resumed Observing Queue resumed 21:01:48     Target Started (8/36) Target started (8/36, NGC 3938 w/SN2022xlp) 21:03:41   Critical Cloud Alert Critical Cloud Alert (Obs.Manager will close the Dome) 21:03:43   HardSuspend Called Hard Suspend is called due to Critical Conditions (cloud) 21:03:45     Target Aborted (8/36) Target aborted (8/36, NGC 3938 w/SN2022xlp) due to cloud 21:03:47   Queue Paused Queue paused for Session Suspension 21:03:49 Session Suspending Session suspending 21:04:36   Dome Closed Dome closed (closing time 50s) 21:04:39 Session Suspended Session suspended 21:15:15     Target Cancelled Target cancelled (8/36, NGC 3938 w/SN2022xlp) due to cloud 21:37:15     Target Cancelled Target cancelled (9/36, AT2023vq) due to cloud 21:59:35     Target Cancelled Target cancelled (10/36, UGC 2926 w/SN2022acyd) due to cloud 22:21:35     Target Cancelled Target cancelled (11/36, AT2023nf (CV)) due to cloud 22:40:19     Target Cancelled Target cancelled (12/36, 29P/Schwassmann-Wachmann) due to cloud 23:02:42     Target Cancelled Target cancelled (13/36, Minkowski 1-13) due to cloud 23:25:02     Target Cancelled Target cancelled (14/36, AT2022vry) due to cloud 23:32:17 Session Resuming Session resuming 23:33:02   Dome Opened Dome opened (opening time 45s) 23:33:04 Session Running Session running 23:33:06   Queue Resumed Observing Queue resumed 23:33:09     Target Started (15/36) Target started (15/36, SN 2022uiv) 23:52:26     Target Completed Target completed (15/36, SN 2022uiv) 23:52:30     Target Started (16/36) Target started (16/36, MCG +5-26-43 w/SN2023af) 23:55:39       Focusing Skipped Foc1 focusing skipped - unable to find a star (TCF-S) 00:11:34     Target Completed Target completed (16/36, MCG +5-26-43 w/SN2023af) 00:12:46     Target Started (17/36) Target started (17/36, NGC 5631 w/SN2022aaiq) 00:15:36       Focusing Skipped Foc1 focusing skipped - star is too dim (TCF-S) 00:28:53   Critical Cloud Alert Critical Cloud Alert (Obs.Manager will close the Dome) 00:28:55   HardSuspend Called Hard Suspend is called due to Critical Conditions (cloud) 00:28:57     Target Aborted (17/36) Target aborted (17/36, NGC 5631 w/SN2022aaiq) due to cloud 00:28:59   Queue Paused Queue paused for Session Suspension 00:29:01 Session Suspending Session suspending 00:29:48   Dome Closed Dome closed (closing time 50s) 00:29:50 Session Suspended Session suspended 00:32:02     Target Cancelled Target cancelled (17/36, NGC 5631 w/SN2022aaiq) due to cloud 00:33:43 Session Resuming Session resuming 00:34:28   Dome Opened Dome opened (opening time 45s) 00:34:30 Session Running Session running 00:34:32   Queue Resumed Observing Queue resumed 00:35:06     Target Started (18/36) Target started (18/36, NGC 2528 w/SN2023jo) 00:38:30       Focusing Started-Foc1 Foc1 Focusing Started (TCF-S) 00:40:58       Focusing Completed Foc1 AutoFocus Completed (Profile No 4) 00:42:09   Critical Cloud Alert Critical Cloud Alert (Obs.Manager will close the Dome) 00:42:11   HardSuspend Called Hard Suspend is called due to Critical Conditions (cloud) 00:42:13     Target Aborted (18/36) Target aborted (18/36, NGC 2528 w/SN2023jo) due to cloud 00:42:15   Queue Paused Queue paused for Session Suspension 00:42:17 Session Suspending Session suspending 00:43:04   Dome Closed Dome closed (closing time 50s) 00:43:06 Session Suspended Session suspended 00:54:02     Target Cancelled Target cancelled (18/36, NGC 2528 w/SN2023jo) due to cloud 01:16:22     Target Cancelled Target cancelled (19/36, NGC 2777 w/SN2022aagp) due to cloud 01:38:42     Target Cancelled Target cancelled (20/36, NGC 3705 w/SN2022xxf) due to cloud 01:58:14     Target Cancelled Target cancelled (21/36, C/2022 E3 (ZTF)) due to cloud 02:19:04     Target Cancelled Target cancelled (22/36, UGC 8046 w/SN2022zxr) due to cloud 02:41:04     Target Cancelled Target cancelled (23/36, LEDA 83727 w/SN2023ex) due to cloud 02:43:16 Session Resuming Session resuming 02:44:01   Dome Opened Dome opened (opening time 45s) 02:44:03 Session Running Session running 02:44:05   Queue Resumed Observing Queue resumed 02:44:08     Target Started (24/36) Target started (24/36, C/2019 U5 (PANSTARRS)) 02:47:21       SoftSuspend Called Soft Suspend is called due to Deteriorating Conditions (too few stars) 02:47:43       Focusing Skipped Foc1 focusing skipped - star is too dim (TCF-S) 02:51:42   Critical Cloud Alert Critical Cloud Alert (Obs.Manager will close the Dome) 02:51:44   HardSuspend Called Hard Suspend is called due to Critical Conditions (cloud) 02:51:47     Target Aborted (24/36) Target aborted (24/36, C/2019 U5 (PANSTARRS)) due to cloud 02:51:49   Queue Paused Queue paused for Session Suspension 02:51:51 Session Suspending Session suspending 02:52:37   Dome Closed Dome closed (closing time 50s) 02:52:39 Session Suspended Session suspended 02:59:48     Target Cancelled Target cancelled (24/36, C/2019 U5 (PANSTARRS)) due to cloud 03:20:08     Target Cancelled Target cancelled (25/36, AT2022abdo) due to cloud 03:42:28     Target Cancelled Target cancelled (26/36, UGC 10407 w/AT2022adyb) due to rain 04:04:28     Target Cancelled Target cancelled (27/36, MCG -3-34-59 w/SN2023gb) due to rain 04:26:49     Target Cancelled Target cancelled (28/36, NGC 5468 w/SN2023cj) due to cloud 04:33:27 User Intervention User request to close and finish session 04:33:30   Queue Aborted Job Queue aborted 04:33:32 Session Closing Session closing 04:33:37   Dome Closed Dome already closed (closed at 02:52, closing time 50s) 04:34:51   Telescope Parked Telescope parked (parking time 70s) 04:35:06   Telescope State Handbox reads 'Scope parked Turn scope off.' 04:35:28   Telescope Switched Off Telescope Power has been switched off via UPB Switch. 04:36:55   Services Stopped Night Services stopped 04:36:57 Session Housekeeping Session Housekeeping started (Create Fits Summary, Transfer Files) 04:37:07 Session Finished Session Finished

Session Alerts & Alarms

Time     Type       Name Detail 18:42:11 Yellow Alert Anomalous Dome Slew Dome slew resumed at Az 211.0° (T+7.4s)

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Operational Issues (2023-01-25, S1090)

• Critical Issues (0)
• Major Issues (0)
• Minor Issues (4)
• Small Defects (2)
• Continuous Improvement (3)
  

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Critical Issues

• None

Major Issues

• None

Minor Issues

• Dome didn't park during Closing Session operations (04:33). User intervention made at 04:33:25 to trigger the ObsManager to stop Job Queue and Close/Finish Session. After entering Closing Session state at 04:33:32, the Dome was checked and the shutter was found to be already closed (Closed at 02:52, closing time 50s). Operation should then proceed to Park Dome, but instead of reporting a Park Dome subtitle, and proceeding to move the dome to Az 90deg an information message was reported "Park Dome has been waiting for more than 3 minutes", and the operation moved on to  'Disconnect PHD2' and 'Park Telescope' etc which proceeded ok.     After the live session finished and the general session was reopened a Manual intervention was made to use the 'Park Dome' button facility.   At end of the S1088 session (2023-01-18) the Park Dome operation also failed and an investigation concluded that failure was due to the dome making a 1 deg slaving movement at the moment that SlewToAzimuth (90) was being commanded, and code was added to SetState_Closing in AstroMain 3.60.10 to turn off slaving.   Logs show Slaving being turned off at 04:33:27.60, the Dome Shutter status being checked at 04:33:37.60 (Closing Stage 0).   At 04:33:38.75 (just a second later) the logs shows WaitForDomeToPark message "Exiting ClosingStage=3 due to 3 minute timeout".  And by 04:33:38.85 operations had moved on to Disconnect PHD2 operations (ClosingStageNo = 4). Code examined, bug found in ClosingStage=1 whereby when Shutter is closed, Closing Stage is incremented twice (instead of once), causing operations to totally miss Closing Stage 2 which would normally command the Park Dome operation.
  Fixed 2023-01-26 (AstroMain 3.60.13) 
   
• Performance of Observatory WebSite seems to have deteriorated.  Unclear if this relates to the website now delivering pages as https instead of http, a separate issue with the host provider, or something else.  PageSpeed Insights (pagespeed.web.dev) was used to analyse the critical pages on the Observatory WebSite.  Examples of improvements inclusion of image width & height where known and fixed (not possible for certain images such as time charts which will always vary in width and length).    Changed
  
    <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
  <html>
  to
  
    <!DOCTYPE html>
  <html lang="en">
  Comparing PageSpeeds from Insights
  
  PageSpeed Insights (Desktop) for weather_current.htm was 79 (Performance), 59 (Accessibility), 68 (Best Practices) 70 (SEO)
but after some changes values went to 100 (Performance), 67 (Accessibility, 92 (Best Practices) 70 (SEO)
PageSpeed Insights (Desktop) for allskylatest.htm was 71 (Performance), 66 (Accessibility), 75 (Best Practices) 80 (SEO)
but after some changes values went to 75 (Performance), 66 (Accessibility, 75 (Best Practices) 80 (SEO)
PageSpeed Insights (Desktop) for session_current.htm was 69 (Performance), 73 (Accessibility), 67 (Best Practices) 80 (SEO)
but after some changes values went to 69 (Performance), 73 (Accessibility, 67 (Best Practices) 80 (SEO)
PageSpeed Insights (Desktop) for comets_2022.htm was 100 (Performance), 100 (Accessibility), 75 (Best Practices) 80 (SEO)
however it contains 20 MB of pictures
  Some recommendations (e.g. use of NextGen Image formats) will take time to investigate, other recommendations (eg Serve static assets (ie remove ?=rand(1,1000000)? ) are not applicable as there is a need to serve freshest available data.  Made some improvements which helped and these, together with possible improvements at the web host server, have improved the situation considerably.  Issue closed after review 2023-01-29
  Fixed 2023-01-26 (Website) 
   
• Telescope slewing shows point errors of around 12'.  Pointing errors at start of sessiom were 12' (progressively improving through session due to automated self-correction). This is most likely due to reattachment of SBIG Camera to the telescope. Held by 3 screw threads the camera is likely in a slightly different position to previous session. Telescope was resynced at start of next session and a short mapping job was after which telescope was parkedturned off and then restarted. Slew errors reduced to < 2 or 3'.
  Fixed 2023-01-29 (Session S1091)  
   
• Guide Reference Pictures indicate a noticeable discrepency between the rotation of Cam1 and Cam2 (23:55). The yellow Cam1 FOV insert in the Cam2 Guide Reference indicate a misalignment of some kind. Examining pictures of MCG +5-26-43 w/SN2023af shows Cam1 Rotation angles of 180.0 or 180.1°.  (so ok), whilst Cam2 Rotation angle is 358.5° (should be 360°, so out by 1.5°).  Cam2 pictures from other targets similarly show angle of 358.5 +/- 0.1° . The ZWO 178MC Camera (Cam2)  need to be rotated to 360.0° position (i.e. anticlockwise rotation by 1.5°) at the start of the next session.   Solution implemented in AstroMain 3.61.6 which moves code over to using AstroMain's own CalcRaDecToXY() routine instead of CCDSoft.Image.RaDecToXY routine. This routine  is used when an Image has been linked ok via a simple link method but fails to Insert a WCS, and has already shown that it can successfully used and avoids the occassional issue associated with the CCDSoft.Image.RaDecToXY routine
  Fixed 2023-02-14 (AstroMain 3.61.6, CCDSoft)

Small Defects

• AzAlt Result Chart legend has 'Forecast Wind' when it actually represents 'Current Wind'.   Legend to be changed from 'Forecast Wind' to 'Wind'
  Fixed 2023-01-26 (AstroMain 3.60.12) 
   
• Discrepency noted between the length of the Wind Direction indicators on the AzAltPlan Chart and those the AzAltResult Chart. The AzAltPlan Chart has much longer indicators than the indicators drawn on AzAltResult chart. Tracing added to AstroPlan (1.35.12) & AstroMain (3.60.12).  Trace Data collected from session S1094 (2023-01-29) shows that the CurrentWindSpeed value is multiplied by a wind speed factor (SU.WindScaleFactor) of 0.70 when the speed is read in from Synoposis data record .  This modified wind speed is then used for the Wind Indicator on AzAltResult Chart in AstroMain. This is thus smaller than the unmodified Forecast Wind Speeds that are used for the Wind Indicators on the AzAlt Plan Chart in AstroPlan and thus explains the discrepency noticed between the two charts.  Fixed in AstroMain 3.61 by dividing the modified CurrentWindSpeed by SU.WindScaleFactor before using it for the AzAltResult Chart.
  Fixed 2023-02-01 (AstroMain 3.61) 

• Session Events table and Session Alerts table generated via 'Save .htm Reports' should add 'text-align: left;' to style of tables. This is to allow text in tables columns to be left justified (rather than centre justified)  when converting pages to use the simple <!DOCTYPE html> form of page. Problems were seen with table when preforming experimental revision to 'notes-2023-01-18.htm' and this was the workaround used. Fonts in page also changes when using the simple !DOCTYPE format.
  Done 2023-01-26 (AstroPlan 1.35.12) 
   
• Look into optimising the compression used for jpg pictures. Particularly the large images like AllSky.LatestImage.an.jpg, AllSky.LatestNightSummary6.jpg.  Jpg pictures in AstroAllSky are current stored with a 95% quality level producing typical sizes of Annotated File. Tests show compression level of 20% (quality of 80%) has minimal differences from original and can reduce a NightSummaryPlo6  from 444 KB to 221 KB and reduce an Annotated AllSky Plot from 289 KB to 88 KB and reduce a PanNorth image from 108 KB to 47 KB.  Added new global JpgSaveQuality As Long = 80&  to AstroAllSky 3.18 (and used it  instead of  95&).  JpgEncoder using a JpgSaveQuality quality factor added to AstroObsCam 1.11.4, but using the encoder with quality 80& and code line 'capImage.Save(gFramePath, jgpEncoder, myEncoderParameters)' caused  a typical ObsCam jpg filesize to go up to 190 KB  from original filesize of 170 KB ( using previous code  'capImage.Save(gFramePath, System.Drawing.Imaging.ImageFormat.Jpeg)' to a new figure of 190 KB. Quality of 70& gets the filesize down to 165 KB, Quality of 60& gets the filesize down to 147 KB for little/no noticeable observable changes deterioration in picture quality.
  Closed 2023-02-01 (AstroAllSky 3.18,  AstroObsCam 1.11.4) 
   
• Look into serving web site images up in next-gen formats. Image formats like WebP and AVIF often provide better compression than PNG or PEG, which means faster downloads and less data consumption.  WebP seems to be supported by a wider range of browsers than AVIF (the latter may not be supported by Edge). See https://ryancooper.com/resources/SaveasWebP.aspx . This is not as straightforward as it seems and requires a larger authoring overhead.  File size of most frequently accessed JPGs (NightSummaryPlots, AllSky Images, ObsCam) have been reduced through greater compression, reducing the benefit in looking at Nex-Gen formats. Ticket placed on hold 2023-02-04.
  To investigate / on-hold 2023-01-26 (Website, AstroWeather, AstroPlan)

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