HUBBLE
SPACE TELESCOPE - Continuing to collect World Class Science
DAILY
REPORT # 4538
PERIOD
COVERED: UT January 31, 2008 (DOY 031)
OBSERVATIONS
SCHEDULED
FGS
11078
HST/FGS
1-Gyro On-Orbit Checkout
This
proposal uses an FGS as an astrometer to observe bright stars
(V<12)
in Position mode, with the two other FGSs operating as guiders.
The
data obtained by the astrometer will be used to "witness" the
pointing
performance of the Observatory in FineLock under 1-gyro
operations.
Each visit of this proposal will have a single Pos mode
exposure,
the duration of which is to be set by target visibility or by
other
tests being conducted in parallel or in sequence with this
proposal.
For planning purposes this proposal specifies an exposure time
of
40 minutes, but this can be adjusted as needed.
S/C
11345
HST/PCS
1-Gyro On-orbit Checkout
This
proposal contains the part of the on-orbit test that cannot be
satisfied
by the science proposals. This includes testing certain M1G,
T1G
and F1G capabilities that could potentially compromise any science
data
collection, but are needed to validate the robustness of 1-gyro
science
mode.
FLIGHT
OPERATIONS SUMMARY:
Significant
Spacecraft Anomalies: (The following are preliminary reports
of
potential non-nominal performance that will be investigated.)
HSTARS:
(None)
COMPLETED
OPS REQUEST:
18191-2
- TMDIAG for CSS/MSS Rate
18194-0
- TMDIAG for CSS/MSS Rate
18193-1
- Execute S/M Recovery SPC Load to Clear SA Position Test
18192-1
- Power On SADE 2: OGS On-Orbit Test
18195-0
- Re-instate TMDIAGs @ 031/22:22z
18196-0
- Reconfigure MAT RF Switches at end of KFSP LGA Operations
18187-0
- Uplink N02Z1100g and set ATP pointer after completion of OGS/KFSP OOT
18197-0
- OBADs for post-OGS OOT LBBIAS
18198-0
- OBADs for post-OGS OOT LBBIAS
18199-0
- Update the Gyro Drift Rate Bias for post-OGS OOT operations
COMPLETED
OPS NOTES: (None)
SCHEDULED SUCCESSFUL
FGS
GSacq 02 02
FGS
REacq 0 0
OBAD
with Maneuver 07 07
SIGNIFICANT
EVENTS:
Flash
Report - Day 3 One Gyro Science (OGS)/Kalman Filter Sun Point
(KFSP)
OOT
The
OGS portion of the OGS/KFSP OOT concluded successfully at 031/11:45.
All
test objectives were met and UKF and control performance was nominal
throughout.
All FGS guide star acquisitions succeeded and fine guidance
continued
until terminated nominally. All OBAD corrections for which
data
is currently available succeeded, with a maximum OBAD attitude
correction
maneuver of 2.44 degrees. The T1G PRT slews and other
activities
conducted by ground command also succeeded nominally.
Preliminary
mean jitter estimates during F1G fine lock periods are
within
7 masecs RMS and were as predicted.
The
KFSP mode was entered at 031/12:42 with a nominal -V1 sunline
capture
from the initial 15 degree offset attitude. Once the sun-line
was
captured at -V1, the RWA bias started to build and was fully
established
within 45 minutes. All KFSP OOT testing was successful. All
of
the test steps executed as planned and the KFSP performance met all
requirements.
The 45 degree offset captures in -V1 and +V3 and the KFSP
Bypass
-V1 and +V3 Captures were successful with minimal overshoots. The
slews
to the sun-line appeared to be pure eigenvector maneuvers and
there
were no noticeable rates about the sun-line after capture.
Recovery
from KFSP to M1G began at 031.23:57. The OOT will complete
tonight
with SMS commanding beginning at 32/06:00. Science will resume
at
32/07:30.