Notice: For the foreseeable future, the daily reports may
contain
apparent discrepancies between some proposal descriptions
and the listed
instrument usage. This is due to the conversion of
previously approved
ACS WFC or HRC observations into WFPC2, or NICMOS
observations
subsequent to the loss of ACS CCD science capability in
late January.
HUBBLE SPACE TELESCOPE - Continuing to collect World Class
Science
DAILY REPORT # 4394
PERIOD COVERED: UT June 28, 2007 (DOY 179)
OBSERVATIONS SCHEDULED
FGS 11214
HST/FGS Astrometric Search for Young Planets Around Beta
Pic and AU Mic
Beta Pic and AU Mic are two nearby Vega-type debris disk
stars. Both of
these disk systems have been spatially resolved in
exquisite detail,
predominantly via the ACS coronagraph and WFPC-2 cameras
onboard HST.
These images exhibit a wealth of morphological features
which provide
compelling indirect evidence that these systems likely
harbor
short-period planetary body{ies}. We propose to use the
superlative
astrometric capabilities of HST/FGS to directly detect
these planets,
hence provide the first direct planet detection in a
Vega-type system
whose disk has been imaged at high spatial resolution.
NIC1/NIC2/NIC3 8794
NICMOS Post-SAA calibration - CR Persistence Part 5
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
images. Each observation will need its own CRMAP, as
different SAA
passages leave different imprints on the NICMOS detectors.
NIC3 11062
NICMOS non-linearity tests
This program incorporates a number of tests to analyse the
count rate
dependent non- linearity seen in NICMOS
spectro-photometric
observations. We will observe a field with stars of a
range in
luminosity in NGC3603 with NICMOS in NIC1: F090M, F110W,
F140W, F160W
NIC2: F110W, F160W, F187W, F205W, and F222M NIC3: F110W,
F150W, F160W,
F175W, and F222M. We will repeat the observations with
flatfield lamp
on, creating artificially high count-rates, allowing tests
of NICMOS
linearity as function of count rate. We first take
exposures with the
lamp off, then exposures with the lamp on, and repeat at
the end with
lamp off. Finally, we continue with taking darks during
occultation. We
will furthermore observe spectro-photometric standard
P041C using the
G096, G141, and G206 grisms in NIC3, and repeat the lamp
off/on/off test
to artificially create a high background.
WFPC2 10818
Very Young Globular Clusters in M31 ?
We propose to use HST's unique high spatial resolution
imaging
capabilities to conclusively confirm or refute the
presence of alleged
very young globular clusters in M31. Such young globular
clusters with
ages < 3 Gyr are not present in our galaxy, and, if
real, would lead to
a striking difference in the age distribution of the GCs
between M31 and
the Millky
Way. If the apparent presence of very young
globular clusters
in M31 is confirmed through our proposed ACS imaging {now
WFPC2 imaging}
with HST, this would suggest major differences in the
history of
assembly of the two galaxies, with probable substantial
late accretion
into M31 which did not occur in our own galaxy.
WFPC2 11025
WFPC2 Cycle 15 CTE Monitor
Monitor CTE changes during Cycle 15. Test for chip-to-chip
differences
in CTE.
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: (None)
SCHEDULED
SUCCESSFUL
FGS GSacq
9
9
FGS
REacq
1
1
OBAD with Maneuver
18
18
COMPLETED OPS NOTES: (None)
SIGNIFICANT EVENTS: (None)