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Attendance: Frédéric Auchère, Radford Perry, Jeff Lesho, Scott Wallace, Tim Grundy, D. Williams, Udo Schühle, Orcun Ergincan.

 
1.      Highlights/recommendations 
    •    CMS operations to be performed weekly, capturing interesting events where possible. Interesting events since last meeting include the VGAM manoeuvres, whose results will be discussed in this month’s meeting 
    •    CMS Operator should switch on CMS >30 minutes earlier than the time at which the observations would start, particularly if the observations to catch (for example) a WOL would need to start at midnight. CMS operations in SOOP Kitchen are timed such that they start 30 minutes after assumed switch-on. 
    •    Note that From LTP04 onwards, SOC will no longer indicate CMS operations at LTP with an RSW_EXT_SPICE. They will still be indicated with CMS “observations”, however. This helps with SOC management of the onboard Solid-State Mass Memory. [No planning problems]
 
 
2.      CMS ops
In the 2 month since the last meeting, there has been another remote-sensing checkout window onboard, during which CMS continued observing (once around a WOL and once around a SAA Rotation event), where the environment may have been a little warmer. 

The remote-sensing payload is right now conducting a further set of “synoptic” observations designed to capitalise on the line-up of the Sun, Parker Solar Probe and Solar Orbiter, and near-quadrature geometry of the Earth-Sun-Spacecraft angle.

 
3.      Anomalies (if any)
N/A                                           
 
 
4.      CMS data and interpretation 
a) See IAS CMS data tool
 

Operations times shown for CMS, since last Ops Team meeting

    a.    STP-136: 2021-02-28T09:39 – 12:25 (DOY 059) around SA Rotation (70º to 60º) @ 10:36:55 – 10:38:55
    ⁃    
    b.    STP-138: 2021-03-08T20:30:14 – 23:55:02 (DOY 067) and 2021-03-09T00:00:06 – 02:55:02 (DOY 068) around TCM (opportunity unused)
    c.    STP-139: 2021-03-15T00:00:15 – 02:55:02 (DOY 074) around WOL @ 01:05 everything looks flat apart from usual fluctuations underneath
    d.    STP-140: 2021-03-22T00:05:14 – 03:00:02 (DOY 081) around WOL @ 01:04 [no data to plot]
    ⁃    Note that the full remote sensing payload had been on for 24 hours at this point, with SPICE having had its heatshield door open for 48 hours
    e.    STP-140: 2021-03-23T15:00:44 – 17:55:02 (DOY 082) around SA Rotation (60º to 56º) @ 16:34:11–16:35:11. HSD is open this day, so slightly different results on CMS-1 that time
    ⁃    Full RS payload continues to be on at this point, with SPICE HSD still open.
    f.    STP-141: 2021-03-29T00:00:14 – 02:55:02 (DOY 088) around WOL @ 01:05everything looks flat apart from usual fluctuations underneath
    g.    STP-141: 2021-03-31T11:30:44 – 14:25:02 (DOY 090) around SA Rotation (56º to 30º) @ 13:07:29 – 13:11:59. This is the change in rotation that typically has the largest effect on CMS: 4 Hz on CMS-2, also visible in CMS-1.
    h.    STP 142: 2021-04-05T00:00:14 – 05:55:02 and 06:00:06 – 10:25:02 (DOY 095) around WOL @01:04:39 and TCM window  (opportunity unused).  everything looks flat apart from usual fluctuations underneath
    i.    STP-143: 2021-04-12T00:00:14 – 02:55:02 (DOY 102) around WOL @ 01:06:10 looks flat
    j.    STP-144: 2021-04-19T00:00:15 – 05:55:02 and 06:00:06 – 09:55:02 (DOY 109) around WOL  01:04 and SA relubrication. 08:43 – 08:51 (30º, 45º, 30º). Effect seen.

RP notes that if you look at the profile of CMS-1 and 2 for the current year, you see a steady rise on the external CMS-2, which at least indicates that it is working and measures a slow accumulation, though very little. CMS-1 profile over the year is basically just consistent with Solar Tempearature.

OE: Germany is working on the simulations, so they’ll be interested in seeing these data. OE to coordinate with DW (see AI below).


5. Future operations:
Already planned

Commanding has been sent to MOC up to and including end of STP 145 (2021-05-02T22:00:00Z)

Upcoming planned CMS Ops:
    1)    2021-04-26T00:05:00Z
    2)    2021-05-01T22:30:00Z (SA Rotation: 30º to 0º)
    3)    2021-05-10T00:00:00Z (WOL)
    4)    2021-05-17T00:00:00Z (WOL)
    5)    2021-05-25T07:30:00Z  (WOL)
    6)    2021-05-31T21:30 (WOL, Aphelion TCM, WOL) relatively speaking, has the highest probability of seeing thruster firing accumulation. (also because of how much  colder we’ll be).

Are these sufficient for what needs to happen in this colder part of the orbit?
We will wait until after the aphelion TCM window, e.g. early July, once we have the results, to see if it’s worth doing a boil off. If it’s above a certain threshold, (e.g. 10 Hz), then we can plan to do a boil-off. Propose Friday 4th June for the next telecon instead, so that we have the data via the previous passes.

To be planned

LTP04.

A) Not all events are entered into the plan, but we know what the major features of the plan are in terms of platform activities (even if timings of the heatshield doors are not all placed yet). Platform activities already known are in the table below.
B) How do we want to approach the VGAM?

N.B. We would need to decide the CMS measurement slots by close-of-business on Thursday of next week (29th April) so that we can integrate them with the mission-wide long-term plan which we finish up the following day.


Event type
Start
End
Details
Priority for CMS?
WOL
2021-06-28T00:05:00Z
2021-06-28T03:05:00Z


MAINT
2021-06-28T15:17:51Z
2021-06-29T03:17:51Z
{"comment" : "first slot after 2021.06.28", "type" : "ANY"}

TCM
2021-06-29T03:20:00Z
2021-06-29T09:20:00Z
{"comment" : "first slot after 2021.06.28", "type" : "type-2"}

SA_ROT
2021-07-04T12:40:31Z
2021-07-04T13:00:31Z
{"end_angle_deg" : "30", "start_angle_deg" : "0"}

WOL
2021-07-05T00:05:00Z
2021-07-05T03:05:00Z


NAV
2021-07-11T22:00:00Z
2021-08-23T00:00:00Z
We now have the FDYN event windows resolved for this VGAM navigation window

WOL
2021-07-11T22:05:00Z
2021-07-12T01:05:00Z


WOL
2021-07-12T08:50:00Z
2021-07-12T11:50:00Z


TCM
2021-07-12T12:00:00Z
2021-07-12T18:00:00Z
{"comment" : "TCM -4W", "type" : "type-2"}
YES
WOL
2021-07-18T22:05:00Z
2021-07-19T01:05:00Z


MAINT
2021-07-19T17:05:31Z
2021-07-19T17:15:31Z
{"type" : "SA_RELUBRICATION"}

WOL
2021-07-25T22:05:00Z
2021-07-26T01:05:00Z


TCM
2021-07-26T01:15:00Z
2021-07-26T07:15:00Z
{"comment" : "TCM -2W", "type" : "type-2"}
YES
WOL
2021-08-01T19:05:00Z
2021-08-01T22:05:00Z


TCM
2021-08-02T00:00:00Z
2021-08-02T13:25:00Z
{"comment" : "TCM -1W", "type" : "type-2"}
YES
SA_ROT
2021-08-04T23:36:34Z
2021-08-04T23:56:34Z
{"end_angle_deg" : "56", "start_angle_deg" : "30"}
YES
WOL
2021-08-05T21:05:00Z
2021-08-06T00:05:00Z


TCM
2021-08-06T01:10:00Z
2021-08-06T08:25:00Z
{"comment" : "TCM -3d", "type" : "type-2"}
YES
TCM
2021-08-08T19:25:00Z
2021-08-09T00:55:00Z
{"comment" : "TCM -6h", "type" : "type-2"}
YES
MAINT
2021-08-09T02:00:00Z
2021-08-09T08:35:00Z
{"comment" : "VGAM-2", "type" : "ANY"}
YES
WOL
2021-08-12T18:24:42Z
2021-08-12T21:24:42Z


SA_ROT
2021-08-12T21:24:42Z
2021-08-12T21:44:42Z
{"end_angle_deg" : "60", "start_angle_deg" : "56"} 
This is the SA angle at which FDYN will roll the s/c below
YES
WOL
2021-08-13T06:05:00Z
2021-08-13T09:05:00Z


TCM
2021-08-13T10:10:00Z
2021-08-13T21:40:00Z
{"comment" : "TCM +1W", "type" : "type-2"}
YES
ROLL
2021-08-16T02:00:00Z
2021-08-16T02:50:00Z
0º -> -20º

WOL
2021-08-19T21:05:00Z
2021-08-20T00:05:00Z


WOL
2021-08-23T00:05:00Z
2021-08-23T03:05:00Z


TCM
2021-08-24T03:30:00Z
2021-08-24T09:30:00Z
{"comment" : "first slot after 2021.08.23", "type" : "type-2"}

WOL
2021-08-26T21:05:00Z
2021-08-27T00:05:00Z


WOL
2021-08-30T00:05:00Z
2021-08-30T03:05:00Z


WOL
2021-09-02T21:05:00Z
2021-09-03T00:05:00Z


MAINT
2021-09-03T11:38:37Z
2021-09-03T11:48:37Z
{"type" : "SA_RELUBRICATION"}
YES
WOL
2021-09-06T00:05:00Z
2021-09-06T03:05:00Z


TCM
2021-09-06T03:15:00Z
2021-09-06T09:15:00Z
{"comment" : "first slot after 2021.09.06", "type" : "type-2"}

MAINT
2021-09-06T14:10:57Z
2021-09-07T02:10:57Z
{"comment" : "first slot after 2021.09.06", "type" : "ANY"}
May be LUT change ongoing.
WOL
2021-09-09T21:00:00Z
2021-09-10T00:00:00Z


ROLL
2021-09-10T00:00:00Z
2021-09-10T00:50:00Z
-20º -> -4º

PTR
2021-09-15T00:00:00Z
2021-09-18T23:00:00Z
{"rsw_number" : "0"}

WOL
2021-09-15T00:05:00Z
2021-09-15T03:05:00Z


WOL
2021-09-18T23:05:00Z
2021-09-19T02:05:00Z


ROLL
2021-09-20T00:00:00Z
2021-09-20T00:50:00Z
-4º -> +20º


RS operations will start up around 17th August, so the management of when they happen needs to be handled, but is usually intuitive (ATT_DIST), although long observations may not happen as much.

LUT update likely around 11th August.


For the future generally, it maybe worth knowing that, with the new move to 3-monthly LTP planning, we’ll have this discussion every 3 months in the CMS telecon (so, next time will be late July).

Question: is there interest here in knowing these event schedules as soon as SOC is sure of the inputs? (Would be mid-July).
 


7.         AOB



8. Next meeeting 4th June at 17:00 CEST.
** NOTE that this is off the usual schedule so that we have the CMS data from aphelion, to decide on whether a boil-off is of interest in early July. **

_______________________
 
Action Items
 
AI-12: MS to provide CMS1 & CMS2 FoV Open (DW will ask MS) important for next VGAM
AI-13: David Williams to investigate SWA temperatures 28th Jan Open
AI-14: CMS team to review table of platform events in LTP04 (above) and make comment on priorities by end of Thursday 29th in USA. 
AI-15: TG and DW to agree on how to coordinate placement of CMS events in LTP04 plan.
AI-16: OE will contact Airbus to see what inputs they need from CMS and SOC to compare with their thermal model
AI-17: David Williams to find out prospective dates for SOWG18 (23rd April)
AI-18: SWA operations resuming from STP 146 TBC — David Williams to check exact date/time  because of effect on CMS-2 temperature.



_________________________

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