ACE Weekly 06/14/2011 - 06/20/2011
All ACE spacecraft subsystems are performing nominally.
========================================================================
Orbit/Attitude:
Type Spin Down Attitude
Date 06/17/2011 06/17/2011
DOY 168 2011 168 2011
Thrusters 3R- 4R- 2R 4R+ 4R-
Duration 8.450 sec 13:31 min
Start 16:25:07z 17:10:40z
Stop 16:25:16z 17:24:11z
HGAStart -5.96deg -5.92deg
HGAStop -5.92deg +7.68deg
SunStart 7.35deg 7.32deg
SunStop 7.32deg 17.16deg
SpinStart 5.0976rpm 5.0026rpm
SpinStop 5.0026rpm 5.0060rpm
Nutation 0.01deg 0.08deg
Firing Continuous 68 pulses
FuelUsed 0.0292lbs 0.2178lbs
FuelRemain 128.4008lbs 128.1828lbs
FinalSCMass 1362.661lbs 1362.443lbs
Thanks to SOHO for releasing 2hrs 10min from DSS-65 after the DSS-54
transmitter was declared red (see AR# G11-0043).
The next attitude maneuver and station keeping maneuver are scheduled
for Thursday 06/30/2011.
=======================================================================
OCRs:
None
========================================================================
Activities:
Data Capture: 100% DOY 149-156 2011
The GRAIL mission is expected to launch 09/08/2011. ACE has reduced DSN
antenna time during September. The current published DSN schedule
(through 09/18/2011) has ACE losing ~1 day worth of recorded data after
10 days. The remainder of the September DSN schedule is being
negotiated.
During last week's solar activity, the ULEIS shutter autonomously
closed. The ULEIS shutter can also close down to 6% and 1% if there is
enough solar activity.
Fri Jun 17 2011, DOY 168 14:45:58z closed to 25%
Sun Jun 19 2011, DOY 170 19:27:34z open to 100%
========================================================================
Anomalies:
DOY 168 06/17/2011 S-ACE-0616 G11-0043 DSS-54 Transmitter Red
DSS-54 transmitter was declared red Thursday evening (167 2000z). The
ACE attitude and spin maneuvers were scheduled for DOY 168 1615z. The
ACE team requested SOHO to shorten their DSS-65 pass by 2hrs 10min and
GEOTAIL to move from DSS-65 to DSS-54. SOHO agreed to the request and
GEOTAIL did not need an uplink. The attitude and spin maneuvers were
performed on DOY 168 without problems.
IMPACT: If SOHO did not shorten their DSS-65 pass, the maneuvers would
need to be either 1) performed during off-hours during the weekend or 2)
risk losing the High-Gain Antenna signal requiring switching to the
Broad-Beam Antenna.
Background Information
The High-Gain Antenna (HGA) drifts between 0.5 and 1.5 degrees per day
away from Earth (the antenna is fixed, the drift is due to the orbit).
The HGA constraint is currently set to 8 degrees where antenna
performance drops ~2dB per degree. The HGA performance drops
precipitously between 10 and 11 degrees. The following table gives the
HGA angle if the maneuver had not been performed on DOY 168.
Sat 06/18/2011 DOY 169 1650z 7 degrees
Sun 06/19/2011 DOY 170 1450z 8 degrees
Mon 06/20/2011 DOY 171 1350z 9 degrees
Tue 06/21/2011 DOY 172 1250z 10 degrees
The attitude maneuver was originally scheduled for Friday since the HGA
angle would be 9 degrees on Monday. Since the HGA constraint wouldn't
have violated until Sunday morning, there was a couple of days when the
maneuvers could have been performed. Ultimately, the Thursday evening
decision to try to still have the maneuver on Friday centered around the
ability to coordinate FD and MMOC personnel over the weekend.
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