1. Observation and Checkout Modes (1) - Introduction -
Initial in-orbit checkout period (60 days?)
Engineering checkout (? days)
Science instrument calibration (60 days?)
During operation
Engineering Mode
Science Observation Modes
Sky survey mode
Pointed observation mode
Safe mode

2. Observation and Checkout Modes (2) - Introduction -
OPERATIONS CONCEPT DOCUMENT (433-OPS-0001)

3. Observation and Checkout Modes (3) - Introduction -
Sky Survey Mode
Sky survey mode is basically zenith pointed throughout the orbit and has two sub modes:
with rocking, and
without rocking.
Rocking provides for more uniform sky coverage and allows for complete sky coverage
within a shorter period of time. Different rocking profiles may be implemented,
(square, sinusoid) with a basic 2-orbit period and a 60-degree maximum amplitude
(above and below the orbit plane). Observations are uninterrupted by downlink transmission
of science data in this mode.
Pointed Observation Mode
Target Inertial maintains the Z-axis on the target to within the 2 degree control capability
of the spacecraft. This mode may be interrupted for downlink transmissions of science data.
Earth avoidance is accomplished in this mode via stored commands that keep the field of view
on the sky while the target is occulted.
Must to be changed
Repointed Observation Mode
By command (TOO) and Autonomous (GRB)

4. Observation and Checkout Modes (4) - Initial Checkout Period -
All TBD: I&T and IOC will collect solicit inputs from all subsystems

5. Observation and Checkout Modes (5) - Engineering Mode -

6. Observation and Checkout Modes (6) - Survey Mode -

7. Observation and Checkout Modes (7) - Orbit -

8. Observation and Checkout Modes (8) - Specifications -
Will be addressed in Session by Steve Ritz

9. Observation and Checkout Modes (9) - Pointed Mode -
Mutually contradicting.
Probably need to be changed
Can we maintain 90% observation
Efficiency in Pointed Mode?

10. Observation and Checkout Modes (10) - Thermal Constraints -

11. Observation and Checkout Modes (11) - Typical Orbits and Attitude Changes -

12. Observation and Checkout Modes (12) - Typical Orbits and Attitude Changes -