HUBBLE
SPACE TELESCOPE - Continuing to collect World Class Science
DAILY
REPORT # 4537
PERIOD
COVERED: UT January 30, 2008 (DOY 030)
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.
WFPC2
11077
HST/WFPC2
1-gyro On-orbit Checkout
The
goal of this program is to verify the performance of the HST under
One
Gyro operation.
As
in previous Two Gyro Testing and Orbital Verification programs the
analysis
will be done by characterizating the Point Spread Function
(PSF)
of PC1 in the F555W filter.
Two
Primary issues addressed by this proposal: - PSF structure and
repeatability
- Pointing, stability, and offset accuracy.
PSF
will be characterized as a function of - exposure time - guide star
brightness
- sky position
For
the Pointing we will characterize: - repeatability of small offsets
-
stability within visibility period - stability across occultations. as
a
function of the guide star brightness
The
Program requires fifteen orbits: (7 for the main target, 1 for the
secondary
target) for two gyro mode, then for 1-gyro mode. The structure
of
the visits is identical to the visits executed as part of the program
10458
"ACS and WFPC2 T
with
the only exception of the NICMOS parallel that have been removed.
The
target selection is based on the visibility in the mid January to
mid
February 2008 timeframe. Final target selection will be confirmed
after
the analysis of the guide star availability.
WFPC2
11497
Observations
of Mars and 2007 WD5
We
are proposing to observe 2007 WD5 prior to its possible impact with
Mars.
In the event that an impact does occur, we will also observe the
asteroid
as it approaches Mars, the impact itself, and the aftermath of
the
impact. HST has unique capabilities to observe this potentially very
unusual
event.
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:
18189-0
- Gyro residual value in TMDIAG
18183-3
- T1G Commanding for OGS OOT
18182-6
- OGS On-Orbit Test
COMPLETED
OPS NOTES: (None)
SCHEDULED
SUCCESSFUL
FGS
GSacq
06
06
FGS
REacq
01
01
OBAD
with Maneuver
26
26
SIGNIFICANT
EVENTS:
Flash
Report - Day 2 One Gyro Science (OGS)/Kalman Filter Sun Point
(KFSP)
OOT
Since
the start of the OGS SMS (029/10:00) there have been 12
acquisitions
and 42 OBADs. All acquisitions and OBADs have been
successful.
We first entered F1G mode at 029/17:08 for the first science
orbit
(astrometry observation). The Mars moving target observation began
at
030/10:50. We continued executing Ops Request 18182-6 containing the
script
for test execution. Performance appeared nominal with analysis
on-going.