HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science

DAILY REPORT    #4718

PERIOD COVERED: 5am October 16 - 5am October 17, 2008 (DOY 290/0900z-291/0900z)

OBSERVATIONS SCHEDULED

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.

FLIGHT OPERATIONS SUMMARY:

Significant Spacecraft Anomalies: (The following are preliminary reports

of potential non-nominal performance that will be investigated.)

HSTARS:

11539 - ACS suspended during High Voltage turn on and SBC transition

           ACS suspended with status buffer messages ACS 715, parameter 166, and

           ACS 707, parameter 0, both occurring at time 61165 corresponding to a

           time of 17:40:16.625. Solar Blind Camera MAMA High Voltage turn on was

           in progress at that time.

11540 - NSSC-1 safed.

           Upon acquisition of signal at 290/21:17:11 the NSSC-1 had safed. Two 486

           ESB messages "D24" (SICDH_TOGGLE_TEST_FAIL)and

           "D01"(SAFE_HLD_MACROS_ACTIVE_INFO) were received at 290/21:14:29.

           SCDHSAFA (Safing Macro Active), SDSTOGF (Toggle Failure Counter),

           SSiCDHT (SIC&DH Toggle OK Flag), and SSIPTBE (PIT Toggle Test) flags

           were set.

COMPLETED OPS REQUEST:

18329-0 - NSSC-1 Pointer for Science SMS Intercept @ 290/1406z

18332-3 - Dump ACS Memory @ 290/1939z

18333-1 - NSSC-1 HW Memory Dump @ 290/2213z

COMPLETED OPS NOTES:

NS-20 - WFPC-II Decontamination Limits Management @290/1746z

                       SCHEDULED      SUCCESSFUL

FGS GSacq               06                   06                                        

FGS REacq                01                   01                    

OBAD with Maneuver 14                    14                        

SIGNIFICANT EVENTS:

Flash Report :

HST Status as of Thursday evening 291/00:00: At 290/17:40:16 UTC, ACS

suspended due to the Solar Blind Camera MAMA low voltage power supply

apparently not coming up properly. At 290/21:14 the NSSC-1 halted. The

halting resulted in the HST486 SIC&DH PIT toggle test failing twenty

seconds later safing the payload with the execution of SMAC20.