NASA Hubble Space Telescope Daily Report #4714
HUBBLE SPACE TELESCOPE DAILY REPORT #4714
Continuing to collect World Class Science
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 Normal w/o AP6 @ 283/17:19z
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 Normal mode upon completion of OR 18304-4.
