OBSS uses a Principal Investigator (PI) model
- The PI, Dr. Kenneth Johnston,
USNO's Scientific Director, is accountable for the OBSS mission. This responsibility includes
on-time and on-budget delivery of the instrument, spacecraft,
ground data analysis system, and archival data
- A Senior Executive Board, comprised of senior executives, assures that mission institutional
activities are aligned and resolves top-level issues.
- The Science Team defines and monitors
scientific mission requirements. It is chaired by Dr.
OBSS stresses cost containment. Realistic requirements will be
set to satisfy the baseline science investigation
achievable within cost and schedule risk. Clear
lines of accountability make a person, not an organization, responsible for each program element.
The partnering institutions stress a badgeless
team approach, and maintain a systems engineering focus throughout definition, development, and
test activities. Frequent and rapid communication
using e-mail and teleconferencing ensures coordination of all project elements.
Institutional and individual roles and responsibilities are clearly delineated. Each individual
overseeing a project element reports to the PM.
Designated System Engineering and Mission Assurance personnel conduct requirements analysis
and verification, specialty engineering, and quality
assurance activities. Design reviews and safety
studies are concurrent with design and fabrication
of the instrument, the spacecraft, and processing
The principal risks for
OBSS involve the CCD performance, solar radiation precession, continuous observations and data
transmission, and possible spacecraft jitter. Each
risk is being aggressively addressed to achieve required performance. In each case any compromise
of performance would result in some loss of astrometric or photometric accuracy. With the excellent
baseline accuracy, the possibly reduced accuracies
would still deliver exciting scientific results.
Decisions involving descope options reside
solely with the PI acting with the advice of the Science Team and approval of the
NASA Midex program office. Descope options include a smaller aperture, a focal
plane populated by fewer CCDs,
and a reduction in accuracy to 80 microarcseconds for stars
brighter than 10th magnitude.
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