Date: February 5th 2007

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science

DAILY REPORT # 4292

PERIOD COVERED: UT February 02,03,04, 2007 (DOY 033,034,035)

OBSERVATIONS SCHEDULED

WFPC2 11025

WFPC2 Cycle 15 CTE Monitor

Monitor CTE changes during Cycle 15 Test for chip-to-chip differences in CTE

FGS 10927

The Weight-Watcher Program for Subdwarfs

We propose to use HST/FGS1r to measure five subdwarf spectroscopic binaries to determine masses for the components Their metallicities, [Fe/H], range from -0 5 to -2 5, and their projected minimum separations range from 9 to 24 mas These binaries are resolvable with HST/FGS1r but not any ground-based technique Currently, there are only two subdwarf systems having any mass measurements The proposed work will boost the total number of subdwarf systems with masses from two to seven, and allow us to construct the first mass-luminosity relation for low-metallicity stars

FLIGHT OPERATIONS SUMMARY:

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

HSTARS: 10669 - NICMOS 602 & 599 At AOS 033/19:00:47 observed that at 033/18:36:20 Received Status Buffer Error NICMOS 602 DUMP TIMEOUT ERROR (P=1, T=12270) At 033/18:36:21 received Status Buffer Error NICMOS 599 DUMP IMAGES NOT DEALLOCATED (P=3, T=12278) SI/SE contacted FOT reference these errors

10670 - GSAcq (2,1,2) failed to RGA Hold At 034/02:45:47 GSAcq (2,1,2)scheduled from 034/02:42:20-02:49:47 had failed to RGA Hold (Gyro Control) Mnemonics QF2STOPF & QSTOP were flagging OBAD #1: V1 -452 30, V2 -239 05, V3 139 60, RSS 530 29 OBAD #2: V1 7 28, V2 0 08, V3 2 45, RSS 7 68 OBAD MAP: V1 -1 41, V2 15 25, V3 -0 52, RSS 15 32

10671 - GSAcq(2,1,2) failed to RGA Hold (Gyro Control) The GSAcq(2,1,2) scheduled at 035/04:49:47 - 04:57:52 failed to RGA Hold due to (QF2STOPF) stop flag indication on FGS2 Pre-acquisition OBADs showed (RSS) attitude correction values of 792 19 and 11 57 arcseconds Post-acquisition OBAD/MAP had 3-axis (RSS) value of 554 46 arcseconds

10672 - OBAD Failed OBAD at 035/13:47:12 failed at 13:49:59 486 message 1903 "OBAD Failed Quaternion" was received

10673 - Structure Current (primary) limit violation Structure Current(CSTRUCCP) flagged yellow high, 5 6 amps, for 1 sample Ops Note 1550-2(2006/355) increased structure current limits by 2 counts due to section 4 solar array short Current yellow high, 5 4 amps Flag occurred at the end of orbit day

COMPLETED OPS REQUEST: 18010-1 - Set Up Tasking Orders for NICMOS FW test 18011-0 - Configure Tasking Orders after FW test activities 18015-0 - Reset NICMOS science data que 18009-0 - Enable Filter Wheel Commanding

COMPLETED OPS NOTES: 1570-0 - NCC Pressure Limit Adjustment 1571-0 - NICMOS Dewar Temperature Limit Adjustment 1572-1 - Reset NICMOS Error Counter per SISE directive 1571-1 - NICMOS Dewar Temperature Limit Adjustment

                       SCHEDULED      SUCCESSFUL

FGS GSacq 13 11 FGS REacq 03 03 OBAD with Maneuver 32 31

SIGNIFICANT EVENTS:

The STcI and SISEs have completed their analysis of the NICMOS science and engineering data and have concluded that all three filter wheels are performing nominally The engineering analog diagnostic data along with all of the SD images were analyzed and provided more than sufficient evidence that the filter wheels were performing nominally 3 internal darks were loss, with no real consequence At ~34/02:43 the NICMOS FW enable flag was set to enable

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