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Hubble Space Telescope
Categories of Failure

Examples

Telescope and/or SI Performance Problem:

            - loss of lock

            - target acquisition failure
    

Scheduling Error Resulting in Scientific Requirements Not Being Met:

            - Missing Exposures

            - Non-Int
    

Proposal Error:

            - Target Coordinates

            - Count rates too low

            - Faint/Bright Limits for Onboard Acquisition Observations
    

Note: Observations are generally not repeated for proposal errors except in special circumstances.