STEREO Weekly Meeting Minutes for 2008-08-26 (Week 35)


ANNOUNCEMENTS
-------------

* None.


INSTRUMENT AND SPACECRAFT STATUS
--------------------------------

* All subsystems on both spacecraft are nominal, except that the Ahead
  spececraft is currently operating on IMU #2.


DISCUSSION AND OPERATIONS CONSTRAINTS
-------------------------------------

Week 34

* On day 233 (Aug 20), during the Ahead pass on station 26, no realtime
  telemetry, commanding, or monitoring was available for the duration of the
  pass.  The problem was traced to a change on the IONET configuration.  All
  SSR data was recovered.

* The same problem occured the next day (Aug 21) for the first hour during the
  station 24 pass on Behind.  JPL restored the IONET configuration to resolve
  the problem.  This represents the third such incident in recent weeks, with a
  total of 16 hours of impact on the mission.  A comment was made that the
  incidents occur several hours after the work which caused the problem, and
  that the DSN needs to address these issues.

* The average daily downlink was 7.4 gigabits on Ahead and 7.8 gigabits on
  Behind.

* A pointing anomaly occured on Behind on Aug 19.  This was due to a GT
  pointing lock loss during a roll speed avoidance procedure.  The problem is
  similar to that which used to be seen on SECCHI stepped calibration rolls.
  An upcoming G&C software load may fix the problem.

Week 35

* The SECCHI aphelion stepped calibration roll is scheduled on Behind today
  (Aug 26) at 20:15 UT.  Behind will reach aphelion on Thursday (Aug 28), at
  20:00 UT.

* All instrument POC equipment has been moved, and testing has begun.  IMPACT
  will be testing on both Ahead and Behind tomorrow (Aug 27), and SECCHI will
  be testing for both spacecraft on Friday (Aug 29).  SWAVES is also testing
  this week.  PLASTIC testing is still to be scheduled.

* SECCHI will perform a software patch on Ahead on Thursday (Aug 28) at 12:00
  UT.

Week 36

* A Project Interface Test will be performed on Behind on Thursday (Sep 4) to
  test out new DTT & SPS software.

Week 37

* No special activities planned.

Week 38

* A momentum dump on Ahead is planned for day 260 (Sep 16) at 13:00 UT.

Week 39

* A momentum dump on Behind is planned for day 267 (Sep 23) at 17:00 UT.


COORDINATED OBSERVATIONS
------------------------

-------------------------------------------------------------------------------
Scheduled activities for Week 35:

M Aug 25 (238)  
T Aug 26 (239)  Behind: SECCHI stepped calibration roll 20:15 UT
W Aug 27 (240)  
T Aug 28 (241)  
F Aug 29 (242)  
S Aug 30 (243)  
S Aug 31 (244)  

-------------------------------------------------------------------------------
Scheduled activities for Week 36:

M Sep 01 (245)  
T Sep 02 (246)  
W Sep 03 (247)  
T Sep 04 (248)  
F Sep 05 (249)  
S Sep 06 (250)  
S Sep 07 (251)  

-------------------------------------------------------------------------------
Scheduled activities for Week 37:

M Sep 08 (252)  
T Sep 09 (253)  
W Sep 10 (254)  
T Sep 11 (255)  
F Sep 12 (256)  
S Sep 13 (257)  
S Sep 14 (258)  

-------------------------------------------------------------------------------
Scheduled activities for Week 38:

M Sep 15 (259)  
T Sep 16 (260)  Ahead: Momentum dump, 13:00 UT
W Sep 17 (261)  
T Sep 18 (262)  
F Sep 19 (263)  
S Sep 20 (264)  
S Sep 21 (265)  

-------------------------------------------------------------------------------
Scheduled activities for Week 39:

M Sep 22 (266)  
T Sep 23 (267)  Behind: Momentum dump, 17:00 UT
W Sep 24 (268)  
T Sep 25 (269)  
F Sep 26 (270)  
S Sep 27 (271)  
S Sep 28 (272)  

-------------------------------------------------------------------------------

Upcoming events:

2008:

SECCHI Stepped calibration rolls
	Ahead:	Sep 23, Dec 16
	Behind:	Aug 26, Dec 2

ICAL-001: Sep 1-5, Oct 6-10, Nov 3-7, Dec 1-5

* Sep 15		Behind: Switch downlink rate to 480 kbps
* Oct 6			Messenger - Mercury fly-by
* Oct 13		Ahead:  Switch downlink rate to 480 kbps
* Oct 16,28		JOP 80, EIT shutterless
* Nov 1-Dec 15		SUMER campaign (may be cancelled)

2009:

ICAL-001: Jan 5-9

SECCHI Stepped calibration rolls
	Ahead:	Mar 10, Jun  9, Sep  2, Nov 24
	Behind:	Mar 10, Jun 16, Sep 22, Dec 22

* Jan 15,22		JOP 80, EIT shutterless
* May 18		Ahead:  Switch downlink rate to 360 kbps
* Jun 8			Behind: Switch downlink rate to 360 kbps
* Aug 4			Both: Increase track duration from 4 to 5 hours
* Aug 10		Ahead:  Switch downlink rate to 160 kbps
* Aug 31		Behind: Switch downlink rate to 160 kbps
* Sep 10		Ahead at L4 Lagrange point
* Sep 29		Messenger - Mercury fly-by
* Oct 25		Behind at L5 Lagrange point