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.