HUBBLE SPACE TELESCOPE - Continuing to collect World Class
Science
DAILY REPORT #4714
PERIOD COVERED: 5am October 9 - 5am October 10, 2008 (DOY
283/0900z-284/0900z)
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: (None)
COMPLETED OPS REQUEST:
18306-5 - Execute Safemode Recovery Macro @ 283/17:10z
18304-4 - Recover SIC & DH-A to
COMPLETED OPS NOTES: (None)
SCHEDULED
SUCCESSFUL
FGS GSacq
09
09
FGS
REacq
00
00
OBAD with Maneuver
18
18
SIGNIFICANT EVENTS:
FLASH REPORT SIC&DH Recovery
At 283/17:19:16 UTC, the SIC&DH was successfully
returned to
upon completion of OR 18304-4.