Daily 3730

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science

DAILY REPORT # 3730

PERIOD COVERED: DOY 308

OBSERVATIONS SCHEDULED


ACS/HRC/WFC 10367

ACS CCDs daily monitor- cycle 13 - part 1

This program consists of a set of basic tests to monitor, the read
noise, the development of hot pixels and test for any source of noise
in ACS CCD detectors. The files, biases and dark will be used to
create reference files for science calibration. This programme will be
for the entire lifetime of ACS.

ACS/WFC/NIC3 10340

PANS

Type Ia supernovae {SNe Ia} provide the only direct evidence for an
accelerating universe, an extraordinary result that needs the most
rigorous test. The case for cosmic acceleration rests on the
observation that SNe Ia at z = 0.5 are about 0.25 mag fainter than
they would be in a universe without acceleration. A powerful and
straightforward way to assess the reliability of the SN Ia measurement
and the conceptual framework of its interpretation is to look for
cosmic deceleration at z 1. This would be a clear signature of a
mixed dark-matter and dark-energy universe. Systematic errors in the
SNe Ia result attributed to grey dust or cosmic evolution of the SN Ia
peak luminosity would not show this change of sign. We have obtained a
toehold on this putative ``epoch of deceleration'' with SN 1997ff at z
= 1.7, and 3 more at z 1 from our Cycle 11 program, all found and
followed by HST. However, this is too important a test to rest on just
a few objects, anyone of which could be subject to a lensed
line-of-sight or misidentification. Here we propose to extend our
measurement with observations of twelve SNe Ia in the range 1.0 z
1.5 or 6 such SNe Ia and 1 ultradistant SN Ia at z = 2, that will be
discovered as a byproduct from proposed Treasury and DD programs.
These objects will provide a much firmer foundation for a conclusion
that touches on important questions of fundamental physics.

NIC1/NIC2/NIC3 8793

NICMOS Post-SAA calibration - CR Persistence Part 4

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.

NIC1/NIC2/NIC3 8794

STScI archive information database not available.

WFPC2 10362

WFPC2 Cycle 13 UV Earth Flats

Monitor flat field stability. This proposal obtains sequences of earth
streak flats to improve the quality of pipeline flat fields for the
WFPC2 UV filter set. These Earth flats will complement the UV earth
flat data obtained during cycles 8-12.

FLIGHT OPERATIONS SUMMARY:

Significant Spacecraft Anomalies: (The following are preliminary
reports of potential non-nominal performance that will be
investigated.)

HSTAR 9580 GSAcq (2,1,1) Loss of Lock. OTA SE review of PTAS
processing revealed GSAcq(2,1,1) required five attempts to
successfully achieve fine lock. Fine Lock was originally achieved on
FGS2 at 302/22:08:05 and on FGS1 at 22:08:42. Both FGSs returned to
SSM control at 22:10:24. After four more attempts, the acquisition was
ultimately successful at 22:17:12.Under investigation.

HSTAR 9581 GSAcq (2,1,1) Loss of Lock. OTA SE review of PTAS
processing revealed GSAcq(2,1,1) required two attempts to successfully
achieve fine lock. Fine Lock was originally achieved on FGS2 at
303/06:38:05 and on FGS1 at 06:39:20. Both FGSs returned to SSM
control at 06:41:15 and the acquisition was ultimately successful at
06:42:15.

HSTAR 9582 GSAcq (2,1,2) Loss of Lock. OTA SE review of PTAS
processing revealed GSAcq(2,1,2) required three attempts to
successfully achieve fine lock. Fine Lock was originally achieved on
FGS2 at 304/18:48:33 and on FGS1 at 18:49:02. Both FGSs returned to
SSM control at 18:50:50. Following another attempt the acquisition was
ultimately successful at 18:55:31.

HSTAR 9583 GSAcq(2,1,1) Loss of Lock. OTA SE review of PTAS processing
revealed GSAcq(2,1,1) required two attempts to successfully achieve
fine lock. Fine Lock was originally achieved on FGS2 at 305/01:53:03
and on FGS1 at 01:53:33. Both FGSs returned to SSM control at 01:55:02
and the acquisition was ultimately successful at 01:56:01.

HSTAR 9584 GSAcq(1,2,2) Loss of Lock. OTA SE review of PTAS processing
revealed GSAcq(1,2,2) required two attempts to successfully achieve
fine lock. Fine Lock was originally achieved on FGS1 at 302/01:42:29
and on FGS2 at 01:43:08. Both FGSs returned to SSM control at 01:44:58
and the acquisition was ultimately successful at 01:46:01.

HSTAR 9585 U1,2RD Update failure. The roll delay U1,2RD at
308/22:23:07 failed with error box results indicating "1 Failed" for
the the mnemonics QEBSTFG0,QEBSTFG1, and QEBSTFG2. 486 status buffer
message 901 received. Under investigation.

COMPLETED OPS REQs: None

OPS NOTES EXECUTED:
1279-0 - HST486 Full RAM Memory Dump @ 309/0328z
1280-0 - HST486 Full EEPROM Memory Dump @ 309/0746z

SCHEDULED SUCCESSFUL FAILURE TIMES
FGS Gsacq 12 12
FGS Reacq 6 6
FHST Update 7 7
LOSS of LOCK


SIGNIFICANT EVENTS: None