STEREO Weekly Meeting Minutes for 2006-12-05 (Week 49)

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

* The instrument doors on the SECCHI Sun-Centered Instrument Package (SCIP)
  suite were opened on the Ahead spacecraft on December 4th.  Initial images
  were taken of the Sun and solar corona.  All indications are that the
  instruments are working correctly.

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

* The SECCHI and PLASTIC instruments were successfully powered back on after
  the P3 perigee and eclipse.  This is the last planned power outage for the
  instruments.

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

Week 48:

* Turned off the SECCHI decontamination heaters.

* Passed through the P3 perigee on Nov 29.  Performed a MAG calibration roll
  and HGA slew.  SECCHI and PLASTIC were powered on after the slew.

Week 49:

* Opened the SECCHI SCIP doors on Dec. 4th.

* Passed through A4 apogee on Dec. 5th.

* A major solar flare occured on Dec. 5th.  SECCHI was not observing at the
  time.  SWAVES data was not yet available.

* Realtime calibration of the SECCHI Guide Telescope (GT) on Ahead on Dec 6.
  The SECCHI team will send small offpoints of up to 80 arcseconds to G&C for
  calibration.  SECCHI wants to wait to allow some data to be downloaded from
  the SSR before initiating their 93 kbps rate for this test.

* The Behind spacecraft will undergo a small 10 second A4+ delta-V maneuver on
  Dec 6, at 20:00 UT.  The backup maneuver is scheduled for Thursday, also at
  20:00 UT.  During the maneuver the spacecraft will be switching to the +Z
  LGA.

* Mission operations is preparing for a new DSN web-based interface.  This will
  be tested on Thursday.  The interface to the instrument teams, including the
  format of the DSN schedule files, will not change.

* Will start spaceweather beacon broadcast post-track on Thursday.  The rate
  will drop to 633 bps, convolutional 1/6th.  Rutherford Appleton Laboratory
  may be able to record telemetry.  Other beacon stations may be able to test
  tracking the spacecraft.  The NOAA software is not ready yet for sending the
  beacon telemetry to the SSC.

* Friday will be performing an HGA calibration to find the beam center.  This
  will involve rolling the spacecraft by +/- 2 degrees and stepping the HGA in
  half degree increments.  This test will be repeated in the future.

* Sunday will be performing a short test of sending data at 720 kbps on the
  HGA.

* SECCHI plans to open their SCIP-B doors on Dec. 13th and performing a GT
  calibration on Dec. 16th.  The GT calibration needs to complete 30 minutes
  before the beginning of track.  SECCHI will start the activity at 09:50 UT
  and finish by 11:20 UT.

* Mission Ops is going to try changing some parameters on the spacecraft to
  damp out the jitter.  They will do this sometime before the 15th on Ahead.
  Higher rate GT data is desirable--SECCHI and APL will coordinate this
  activity.

* Mission Ops will be doing a power test on Monday, Dec 11, as well as testing
  auto-tracking on the HGA.

* The SECCHI HI door on Ahead will be opened Monday, Dec 11.  This requires 93
  kbps realtime rate.

* The last perigee P4 will occur on Dec 12th, at 08:30 for Ahead, and 09:54 for
  Behind.  Perigee will be above 6600 km for both spacecraft.

* The 3rd IMPACT MAG calibration roll will be performed On the outbound side of
  P4, starting about one hour after perigee.  This will include a slew of the
  HGA, but no SECCHI participation is required.

* Space weather broadcast will be stopped on Monday, Dec 11th, and resumed on
  Wednesday, Dec 13th.

* The first lunar swingby will occur on Friday, December 15th, at 21:03 for
  Behind, and 21:27 for Ahead.  There will be track coverage for both
  spacecraft during the swingby.  Ahead will pass over the Moon at about 5600
  km altitude, and Behind at about 10,000 km altitude.

Week 51:

* Ahead has daily tracks of about 3 hours.

* There are potential maneuvers for Behind at S1+ (Prime: Dec 21, Backup: Dec
  23), and at A5 (Prime: Jan 8th, Backup: January 11th).  We'll know better
  next week whether these maneuvers are needed.  There are no P4 maneuvers, and
  no more maneuvers for Ahead.

* Now that maneuvers are over for Ahead, will start needing to do momentum
  dumps.  The first is scheduled for Dec. 21st.  It's not clear yet how often
  these momentum dumps will be needed, possibly on the order of once every 20
  days.  The cadence will be different for Ahead and Behind.

* The first SWAVES calibration roll is planned for December 18th on Ahead, and
  December 19th on Behind.

Other:

* STE-B maneuver should be done before opening IMPACT doors.  Mission Ops is
  still trying to figure out how to do this maneuver.  The SECCHI team has an
  action item to determine whether they're concerned about possible 10 degree
  offpoints after their door is open.

* Status of HI maneuvers:  The 180 degree and flat-field roll maneuvers have
  been tested.  The 90/270 degree roll maneuver is ready to be tested.  The
  stray light offpoint maneuver is still in development.

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

Scheduled activities for Week 49:

M Dec 04 (338)  Ahead: Open EUVI, COR1, & COR2 doors, first light
T Dec 05 (339)  
W Dec 06 (340)  A4 Apogee
		Ahead: 2nd GT Calibration
		Behind: A4 Prime Delta V Maneuver
T Dec 07 (341)  Behind: A4 Backup Delta V Maneuver
		Both: Start space weather beacon broadcast post-track
F Dec 08 (342)	HGA calibration
S Dec 09 (343)  
S Dec 10 (344)  
-------------------------------------------------------------------------------
Scheduled activities for Week 50:

M Dec 11 (345)  Ahead: Open HI baffle cover door, first light
		Both: Power test
		Both: Auto track on HGA test
		Both: Stop space weather beacon broadcast post-track
T Dec 12 (346)  P4 Perigee
W Dec 13 (347)  Behind: Open EUVI, COR1, & COR2 doors, first light
		Both: Restart space weather beacon broadcast post-track
T Dec 14 (348)  
F Dec 15 (349)  S1 first lunar swingby
S Dec 16 (350)  Behind: 2nd GT Calibration
S Dec 17 (351)  
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Scheduled activities for Week 51:

M Dec 18 (352)  Ahead:  First SWAVES smooth calibration rolls
T Dec 19 (353)  Behind: First SWAVES smooth calibration rolls
W Dec 20 (354)  
T Dec 21 (355)  Behind: S1+ Prime Delta V Maneuver
F Dec 22 (356)  
S Dec 23 (357)  Behind: S1+ Backup Delta V Maneuver
S Dec 24 (358)