HUBBLE
SPACE TELESCOPE - Continuing to collect World Class Science
DAILY
REPORT # 4536
PERIOD
COVERED: UT January 29, 2008 (DOY 029)
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.
FGS
11212
Filling
the Period Gap for Massive Binaries
The
current census of binaries among the massive O-type stars is
seriously
incomplete for systems in the period range from years to
millennia
because the radial velocity variations are too small and the
angular
separations too close for easy detection. Here we propose to
discover
binaries in this observational gap through a Faint Guidance
Sensor
SNAP survey of relatively bright targets listed in the Galactic O
Star
Catalog. Our primary goal is to determine the binary frequency
among
those in the cluster/association, field, and runaway groups. The
results
will help us assess the role of binaries in massive star
formation
and in the processes that lead to the ejection of massive
stars
from their natal clusters. The program will also lead to the
identification
of new, close binaries that will be targets of long term
spectroscopic
and high angular resolution observations to determine
their
masses and distances. The results will also be important for the
interpretation
of the spectra of suspected and newly identified binary
and
multiple systems.
NIC1/NIC2/NIC3
8795
NICMOS Post-SAA calibration - CR Persistence Part 6
A
new procedure proposed to alleviate the CR-persistence problem of
NICMOS.
Dark frames will be obtained immediately upon exiting the SAA
contour
23, and every time a NICMOS exposure is scheduled within 50
minutes
of coming out of the SAA. The darks will be obtained in parallel
in
all three NICMOS Cameras. The POST-SAA darks will be non-standard
reference
files available to users with a USEAFTER date/time mark. The
keyword
'USEAFTER=date/time' will also be added to the header of each
POST-SAA
DARK frame. The keyword must be populated with the time, in
addition
to the date, because HST crosses the SAA ~8 times per day so
each
POST-SAA DARK will need to have the appropriate time specified, for
users
to identify the ones they need. Both the raw and processed images
will
be archived as POST-SAA DARKSs. Generally we expect that all NICMOS
science/calibration
observations started within 50 minutes of leaving an
SAA
will need such maps to remove the CR persistence from the science i
mages.
Each observation will need its own CRMAP, as different SAA
passages
leave different imprints on the NICMOS detectors.
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 rebustness 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 characterizing 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
11079
Treasury
Imaging of Star Forming Regions in the Local Group:
Complementing
the GALEX and NOAO Surveys
We
propose to use WFPC2 to image the most interesting star-forming
regions
in the Local Group galaxies, to resolve their young stellar
populations.
We will use a set of filters including F170W, which is
critical
to detect and characterize the most massive stars, to whose hot
temperatures
colors at longer wavelengths are not sensitive. WFPC2's
field
of view ideally matches the typical size of the star-forming
regions,
and its spatial resolution allows us to measure individual
stars,
given the proximity of these galaxies. The resulting H-R diagrams
will
enable studies of star-formation properties in these regions, which
cover
largely differing metallicities {a factor of 17, compared to the
factor
of 4 explored so far} and characteristics. The results will
further
our understanding of the star-formation process, of the
interplay
between massive stars and environment, the properties of dust,
and
will provide the key to interpret integrated measurements of
star-formation
indicators {UV, IR, Halpha} available for several
hundreds
more distant galaxies. Our recent deep surveys of these
galaxies
with GALEX {FUV, NUV} and ground-based imaging {UBVRI, Halpha,
[OIII]
and [SII]} provided the identification of the most relevant SF
sites.
In addition to our scientific analysis, we will provide catalogs
of
HST photometry in 6 bands, matched corollary ground-based data, and
UV,
Halpha and IR integrated measurements of the associations, for
comparison
of integrated star-formation indices to the resolved
populations.
We envisage an EPO component.
WFPC2
11234
A
Brief Revisit of the Crab
We
propose using WFPC2 to obtain continuum-dominated images of the Crab
pulsar
and environs closely duplicating archival exposures from 1994 and
1995.
By matching the archival data we can realize ~3mas precision
astrometry
with a minimum of systematic effects over a maximum {~13.5y}
baseline.
This determines the Crab proper motion to better than
0.3mas/yr
{3km/s} accuracy and measures its position angle to better
than
1.5degrees, i.e. reducing the errors of the best present {HST
archive}
measurement by a factor of three. Most importantly, this
provide
a nearly systematic-free result. This proper motion measurement
would
match the precision of the CXO-measured angular momentum vector.
Comparison
of these vectors is the foundation of an effort to understand
the
physical origin of the large momentum kick at pulsar birth.
FLIGHT
OPERATIONS SUMMARY:
Significant
Spacecraft Anomalies: (The following are preliminary reports
of
potential non-nominal performance that will be investigated.)
HSTARS:
11164
– On January 19, GSAcq(1,3,3) required multiple attempts for CT-DV
OTA SE review of PTAS processing reviews that GSAcq(1,3,3) at
019:09:37:54.000 required multiple attempts to achieve CT-DV on
FGS1.
The acquisition was successful.
COMPLETED
OPS REQUEST:
18181-3
- Setup for OGS/KFSP OOT
18188-1
- FHST Map to configure FHST slots A & B
18054-0
- Preview KF Sun Vector Data via Telemetry Diags
COMPLETED
OPS NOTES:
1631-1
- Configure new KF Safemode Test to Disable
1665-0
- ODSGYRL limit for OGS/KFSP on orbit-test
1667-1
- Temp Limit Change for FHST Target Suppress for OGS OOT
SCHEDULED
SUCCESSFUL
FGS
GSacq
10
10
FGS
REacq
01
01
OBAD
with Maneuver
22
22
SIGNIFICANT
EVENTS:
Flash
Report - Day 1 One Gyro Science (OGS) /Kalman Filer Sun Point
(KFSP)
OOT
At
29/08:56, commanding began for the OGS/KFSP on-orbit test with Ops
Request
18181-3. Ops Request loaded the OGS and KFSP macros and
configured
for Universal Kalman Filter operation. Ops request 18182-4
was
started containing the script for the test execution. The transition
to
the OGS SMS took place at 029/10:00. HST was transitioned to One Gyro
mode
at 29/10:34. The initial orbits were in M1G mode at a benign
attitude.
The first transition to T1G mode took place at 29/12:03. First
pair
of OBADs were executed at 29/12:06 and 12:14. Performance appeared
nominal
with analysis on-going.
The
first OGS guide star acquisition was performed starting at 029/17:03
during
a ZOE interval. Telemetry at AOS indicated that the acquisition
succeeded.
F1G fine lock was maintained until the scheduled termination
at
029/18:09. Initial assessment of pointing performance indicates a
1-sigma
telescope pointing jitter of approximately 4 milliarcseconds for
this
F1G interval.